IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

37 files changed, 165 insertions, 215 deletions

diff --git a/drivers/serial/21285.c b/drivers/serial/21285.c
index 76d83ad..6a1a568 100644
--- a/drivers/serial/21285.c
+++ b/drivers/serial/21285.c
@@ -85,7 +85,7 @@ static void serial21285_enable_ms(struct uart_port *port)
 {
 }
 
-static irqreturn_t serial21285_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct tty_struct *tty = port->info->tty;
@@ -123,7 +123,7 @@ static irqreturn_t serial21285_rx_chars(int irq, void *dev_id, struct pt_regs *r
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t serial21285_tx_chars(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t serial21285_tx_chars(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct circ_buf *xmit = &port->info->xmit;
diff --git a/drivers/serial/68328serial.c b/drivers/serial/68328serial.c
index bac853c..9b8b585 100644
--- a/drivers/serial/68328serial.c
+++ b/drivers/serial/68328serial.c
@@ -275,8 +275,7 @@ static void status_handle(struct m68k_serial *info, unsigned short status)
 	return;
 }
 
-static void receive_chars(struct m68k_serial *info, struct pt_regs *regs,
-			  unsigned short rx)
+static void receive_chars(struct m68k_serial *info, unsigned short rx)
 {
 	struct tty_struct *tty = info->tty;
 	m68328_uart *uart = &uart_addr[info->line];
@@ -377,7 +376,7 @@ clear_and_return:
 /*
  * This is the serial driver's generic interrupt routine
  */
-irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+irqreturn_t rs_interrupt(int irq, void *dev_id)
 {
 	struct m68k_serial * info;
 	m68328_uart *uart;
@@ -394,10 +393,10 @@ irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 #ifdef USE_INTS
 	tx = uart->utx.w;
 
-	if (rx & URX_DATA_READY) receive_chars(info, regs, rx);
+	if (rx & URX_DATA_READY) receive_chars(info, rx);
 	if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 #else
-	receive_chars(info, regs, rx);		
+	receive_chars(info, rx);		
 #endif
 	return IRQ_HANDLED;
 }
diff --git a/drivers/serial/68360serial.c b/drivers/serial/68360serial.c
index 1b299e8..4e56ec8 100644
--- a/drivers/serial/68360serial.c
+++ b/drivers/serial/68360serial.c
@@ -612,7 +612,7 @@ static _INLINE_ void check_modem_status(struct async_struct *info)
  * This is the serial driver's interrupt routine for a single port
  */
 /* static void rs_360_interrupt(void *dev_id) */ /* until and if we start servicing irqs here */
-static void rs_360_interrupt(int vec, void *dev_id, struct pt_regs *fp)
+static void rs_360_interrupt(int vec, void *dev_id)
 {
 	u_char	events;
 	int	idx;
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index cc2a205..e34bd03 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1175,7 +1175,7 @@ static void serial8250_enable_ms(struct uart_port *port)
 }
 
 static void
-receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
+receive_chars(struct uart_8250_port *up, int *status)
 {
 	struct tty_struct *tty = up->port.info->tty;
 	unsigned char ch, lsr = *status;
@@ -1233,7 +1233,7 @@ receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
 			else if (lsr & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 
 		uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
@@ -1309,7 +1309,7 @@ static unsigned int check_modem_status(struct uart_8250_port *up)
  * This handles the interrupt from one port.
  */
 static inline void
-serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
+serial8250_handle_port(struct uart_8250_port *up)
 {
 	unsigned int status;
 
@@ -1320,7 +1320,7 @@ serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
 	DEBUG_INTR("status = %x...", status);
 
 	if (status & UART_LSR_DR)
-		receive_chars(up, &status, regs);
+		receive_chars(up, &status);
 	check_modem_status(up);
 	if (status & UART_LSR_THRE)
 		transmit_chars(up);
@@ -1342,7 +1342,7 @@ serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
  * This means we need to loop through all ports. checking that they
  * don't have an interrupt pending.
  */
-static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
 {
 	struct irq_info *i = dev_id;
 	struct list_head *l, *end = NULL;
@@ -1361,7 +1361,7 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *r
 
 		iir = serial_in(up, UART_IIR);
 		if (!(iir & UART_IIR_NO_INT)) {
-			serial8250_handle_port(up, regs);
+			serial8250_handle_port(up);
 
 			handled = 1;
 
@@ -1461,7 +1461,7 @@ static void serial8250_timeout(unsigned long data)
 
 	iir = serial_in(up, UART_IIR);
 	if (!(iir & UART_IIR_NO_INT))
-		serial8250_handle_port(up, NULL);
+		serial8250_handle_port(up);
 
 	timeout = up->port.timeout;
 	timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c
index 7311d84..4213fab 100644
--- a/drivers/serial/amba-pl010.c
+++ b/drivers/serial/amba-pl010.c
@@ -111,12 +111,7 @@ static void pl010_enable_ms(struct uart_port *port)
 	writel(cr, port->membase + UART010_CR);
 }
 
-static void
-#ifdef SUPPORT_SYSRQ
-pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
-#else
-pl010_rx_chars(struct uart_port *port)
-#endif
+static void pl010_rx_chars(struct uart_port *port)
 {
 	struct tty_struct *tty = port->info->tty;
 	unsigned int status, ch, flag, rsr, max_count = 256;
@@ -156,7 +151,7 @@ pl010_rx_chars(struct uart_port *port)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(port, ch, regs))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
 		uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
@@ -227,7 +222,7 @@ static void pl010_modem_status(struct uart_port *port)
 	wake_up_interruptible(&uap->port.info->delta_msr_wait);
 }
 
-static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t pl010_int(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
@@ -239,11 +234,7 @@ static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
 	if (status) {
 		do {
 			if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
-#ifdef SUPPORT_SYSRQ
-				pl010_rx_chars(port, regs);
-#else
 				pl010_rx_chars(port);
-#endif
 			if (status & UART010_IIR_MIS)
 				pl010_modem_status(port);
 			if (status & UART010_IIR_TIS)
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index a8d7124..d503625 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -107,12 +107,7 @@ static void pl011_enable_ms(struct uart_port *port)
 	writew(uap->im, uap->port.membase + UART011_IMSC);
 }
 
-static void
-#ifdef SUPPORT_SYSRQ
-pl011_rx_chars(struct uart_amba_port *uap, struct pt_regs *regs)
-#else
-pl011_rx_chars(struct uart_amba_port *uap)
-#endif
+static void pl011_rx_chars(struct uart_amba_port *uap)
 {
 	struct tty_struct *tty = uap->port.info->tty;
 	unsigned int status, ch, flag, max_count = 256;
@@ -150,7 +145,7 @@ pl011_rx_chars(struct uart_amba_port *uap)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&uap->port, ch & 255, regs))
+		if (uart_handle_sysrq_char(&uap->port, ch & 255))
 			goto ignore_char;
 
 		uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);
@@ -218,7 +213,7 @@ static void pl011_modem_status(struct uart_amba_port *uap)
 	wake_up_interruptible(&uap->port.info->delta_msr_wait);
 }
 
-static irqreturn_t pl011_int(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t pl011_int(int irq, void *dev_id)
 {
 	struct uart_amba_port *uap = dev_id;
 	unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
@@ -234,11 +229,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id, struct pt_regs *regs)
 			       uap->port.membase + UART011_ICR);
 
 			if (status & (UART011_RTIS|UART011_RXIS))
-#ifdef SUPPORT_SYSRQ
-				pl011_rx_chars(uap, regs);
-#else
 				pl011_rx_chars(uap);
-#endif
 			if (status & (UART011_DSRMIS|UART011_DCDMIS|
 				      UART011_CTSMIS|UART011_RIMIS))
 				pl011_modem_status(uap);
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 955c46d..391a1f4 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -249,7 +249,7 @@ static void atmel_break_ctl(struct uart_port *port, int break_state)
 /*
  * Characters received (called from interrupt handler)
  */
-static void atmel_rx_chars(struct uart_port *port, struct pt_regs *regs)
+static void atmel_rx_chars(struct uart_port *port)
 {
 	struct tty_struct *tty = port->info->tty;
 	unsigned int status, ch, flg;
@@ -291,7 +291,7 @@ static void atmel_rx_chars(struct uart_port *port, struct pt_regs *regs)
 				flg = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(port, ch, regs))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
 		uart_insert_char(port, status, ATMEL_US_OVRE, ch, flg);
@@ -339,7 +339,7 @@ static void atmel_tx_chars(struct uart_port *port)
 /*
  * Interrupt handler
  */
-static irqreturn_t atmel_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t atmel_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
@@ -350,7 +350,7 @@ static irqreturn_t atmel_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	while (pending) {
 		/* Interrupt receive */
 		if (pending & ATMEL_US_RXRDY)
-			atmel_rx_chars(port, regs);
+			atmel_rx_chars(port);
 
 		// TODO: All reads to CSR will clear these interrupts!
 		if (pending & ATMEL_US_RIIC) port->icount.rng++;
diff --git a/drivers/serial/clps711x.c b/drivers/serial/clps711x.c
index f27d852..5980127 100644
--- a/drivers/serial/clps711x.c
+++ b/drivers/serial/clps711x.c
@@ -93,7 +93,7 @@ static void clps711xuart_enable_ms(struct uart_port *port)
 {
 }
 
-static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct tty_struct *tty = port->info->tty;
@@ -131,7 +131,7 @@ static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *re
 #endif
 		}
 
-		if (uart_handle_sysrq_char(port, ch, regs))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
 		/*
@@ -147,7 +147,7 @@ static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *re
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct circ_buf *xmit = &port->info->xmit;
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c
index a0d6136..0abb544 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -248,7 +248,7 @@ static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
 /*
  * Transmit characters, refill buffer descriptor, if possible
  */
-static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs)
+static void cpm_uart_int_tx(struct uart_port *port)
 {
 	pr_debug("CPM uart[%d]:TX INT\n", port->line);
 
@@ -258,7 +258,7 @@ static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs)
 /*
  * Receive characters
  */
-static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
+static void cpm_uart_int_rx(struct uart_port *port)
 {
 	int i;
 	unsigned char ch, *cp;
@@ -304,7 +304,7 @@ static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
 			if (status &
 			    (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
 				goto handle_error;
-			if (uart_handle_sysrq_char(port, ch, regs))
+			if (uart_handle_sysrq_char(port, ch))
 				continue;
 
 		      error_return:
@@ -373,7 +373,7 @@ static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
 /*
  * Asynchron mode interrupt handler
  */
-static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t cpm_uart_int(int irq, void *data)
 {
 	u8 events;
 	struct uart_port *port = (struct uart_port *)data;
@@ -389,18 +389,18 @@ static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs)
 		if (events & SMCM_BRKE)
 			uart_handle_break(port);
 		if (events & SMCM_RX)
-			cpm_uart_int_rx(port, regs);
+			cpm_uart_int_rx(port);
 		if (events & SMCM_TX)
-			cpm_uart_int_tx(port, regs);
+			cpm_uart_int_tx(port);
 	} else {
 		events = sccp->scc_scce;
 		sccp->scc_scce = events;
 		if (events & UART_SCCM_BRKE)
 			uart_handle_break(port);
 		if (events & UART_SCCM_RX)
-			cpm_uart_int_rx(port, regs);
+			cpm_uart_int_rx(port);
 		if (events & UART_SCCM_TX)
-			cpm_uart_int_tx(port, regs);
+			cpm_uart_int_tx(port);
 	}
 	return (events) ? IRQ_HANDLED : IRQ_NONE;
 }
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 9851d9e..7a24e53 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -2346,7 +2346,7 @@ start_receive(struct e100_serial *info)
 */
 
 static irqreturn_t
-tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+tr_interrupt(int irq, void *dev_id)
 {
 	struct e100_serial *info;
 	unsigned long ireg;
@@ -2395,7 +2395,7 @@ tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 /* dma input channel interrupt handler */
 
 static irqreturn_t
-rec_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+rec_interrupt(int irq, void *dev_id)
 {
 	struct e100_serial *info;
 	unsigned long ireg;
@@ -3054,7 +3054,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
  * ser_int duration: just sending: 8-15 us normally, up to 73 us
  */
 static irqreturn_t
-ser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+ser_interrupt(int irq, void *dev_id)
 {
 	static volatile int tx_started = 0;
 	struct e100_serial *info;
diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c
index 8a98aae..53662b3 100644
--- a/drivers/serial/dz.c
+++ b/drivers/serial/dz.c
@@ -339,7 +339,7 @@ static inline void check_modem_status(struct dz_port *dport)
  * It deals with the multiple ports.
  * ------------------------------------------------------------
  */
-static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs)
+static irqreturn_t dz_interrupt(int irq, void *dev)
 {
 	struct dz_port *dport;
 	unsigned short status;
diff --git a/drivers/serial/icom.c b/drivers/serial/icom.c
index a3c00a2..8aa0f641 100644
--- a/drivers/serial/icom.c
+++ b/drivers/serial/icom.c
@@ -844,8 +844,7 @@ static void process_interrupt(u16 port_int_reg,
 	spin_unlock(&icom_port->uart_port.lock);
 }
 
-static irqreturn_t icom_interrupt(int irq, void *dev_id,
-				  struct pt_regs *regs)
+static irqreturn_t icom_interrupt(int irq, void *dev_id)
 {
 	void __iomem * int_reg;
 	u32 adapter_interrupts;
diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 4a142d6b..ee5c782 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -182,7 +182,7 @@ static void imx_start_tx(struct uart_port *port)
 		imx_transmit_buffer(sport);
 }
 
-static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t imx_rtsint(int irq, void *dev_id)
 {
 	struct imx_port *sport = (struct imx_port *)dev_id;
 	unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;
@@ -198,7 +198,7 @@ static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t imx_txint(int irq, void *dev_id)
 {
 	struct imx_port *sport = (struct imx_port *)dev_id;
 	struct circ_buf *xmit = &sport->port.info->xmit;
@@ -227,7 +227,7 @@ out:
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t imx_rxint(int irq, void *dev_id)
 {
 	struct imx_port *sport = dev_id;
 	unsigned int rx,flg,ignored = 0;
@@ -248,7 +248,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
 		}
 
 		if (uart_handle_sysrq_char
-		            (&sport->port, (unsigned char)rx, regs))
+		            (&sport->port, (unsigned char)rx))
 			goto ignore_char;
 
 		if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )
diff --git a/drivers/serial/ioc3_serial.c b/drivers/serial/ioc3_serial.c
index 8097cd9..2308d26 100644
--- a/drivers/serial/ioc3_serial.c
+++ b/drivers/serial/ioc3_serial.c
@@ -1428,13 +1428,12 @@ static int receive_chars(struct uart_port *the_port)
  * @is : submodule
  * @idd: driver data
  * @pending: interrupts to handle
- * @regs: pt_regs
  */
 
 static int inline
 ioc3uart_intr_one(struct ioc3_submodule *is,
 			struct ioc3_driver_data *idd,
-			unsigned int pending, struct pt_regs *regs)
+			unsigned int pending)
 {
 	int port_num = GET_PORT_FROM_SIO_IR(pending);
 	struct port_hooks *hooks;
@@ -1628,13 +1627,12 @@ ioc3uart_intr_one(struct ioc3_submodule *is,
  * @is : submodule
  * @idd: driver data
  * @pending: interrupts to handle
- * @regs: pt_regs
  *
  */
 
 static int ioc3uart_intr(struct ioc3_submodule *is,
 			struct ioc3_driver_data *idd,
-			unsigned int pending, struct pt_regs *regs)
+			unsigned int pending)
 {
 	int ret = 0;
 
@@ -1644,9 +1642,9 @@ static int ioc3uart_intr(struct ioc3_submodule *is,
 	 */
 
 	if (pending & SIO_IR_SA)
-		ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA, regs);
+		ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA);
 	if (pending & SIO_IR_SB)
-		ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB, regs);
+		ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB);
 
 	return ret;
 }
diff --git a/drivers/serial/ioc4_serial.c b/drivers/serial/ioc4_serial.c
index 5ec4716..98ce88d 100644
--- a/drivers/serial/ioc4_serial.c
+++ b/drivers/serial/ioc4_serial.c
@@ -987,10 +987,9 @@ intr_connect(struct ioc4_soft *soft, int type,
  * ioc4_intr - Top level IOC4 interrupt handler.
  * @irq: irq value
  * @arg: handler arg
- * @regs: registers
  */
 
-static irqreturn_t ioc4_intr(int irq, void *arg, struct pt_regs *regs)
+static irqreturn_t ioc4_intr(int irq, void *arg)
 {
 	struct ioc4_soft *soft;
 	uint32_t this_ir, this_mir;
diff --git a/drivers/serial/ip22zilog.c b/drivers/serial/ip22zilog.c
index dbf13c0..dca6c1b 100644
--- a/drivers/serial/ip22zilog.c
+++ b/drivers/serial/ip22zilog.c
@@ -252,8 +252,7 @@ static void ip22zilog_maybe_update_regs(struct uart_ip22zilog_port *up,
 }
 
 static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
-				   struct zilog_channel *channel,
-				   struct pt_regs *regs)
+				   struct zilog_channel *channel)
 {
 	struct tty_struct *tty = up->port.info->tty;	/* XXX info==NULL? */
 
@@ -319,7 +318,7 @@ static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
 			else if (r1 & CRC_ERR)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto next_char;
 
 		if (up->port.ignore_status_mask == 0xff ||
@@ -339,8 +338,7 @@ static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
 }
 
 static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
-				   struct zilog_channel *channel,
-				   struct pt_regs *regs)
+				   struct zilog_channel *channel)
 {
 	unsigned char status;
 
@@ -443,7 +441,7 @@ ack_tx_int:
 	ZS_WSYNC(channel);
 }
 
-static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
 {
 	struct uart_ip22zilog_port *up = dev_id;
 
@@ -462,9 +460,9 @@ static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id, struct pt_regs *re
 			ZS_WSYNC(channel);
 
 			if (r3 & CHARxIP)
-				ip22zilog_receive_chars(up, channel, regs);
+				ip22zilog_receive_chars(up, channel);
 			if (r3 & CHAEXT)
-				ip22zilog_status_handle(up, channel, regs);
+				ip22zilog_status_handle(up, channel);
 			if (r3 & CHATxIP)
 				ip22zilog_transmit_chars(up, channel);
 		}
@@ -481,9 +479,9 @@ static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id, struct pt_regs *re
 			ZS_WSYNC(channel);
 
 			if (r3 & CHBRxIP)
-				ip22zilog_receive_chars(up, channel, regs);
+				ip22zilog_receive_chars(up, channel);
 			if (r3 & CHBEXT)
-				ip22zilog_status_handle(up, channel, regs);
+				ip22zilog_status_handle(up, channel);
 			if (r3 & CHBTxIP)
 				ip22zilog_transmit_chars(up, channel);
 		}
diff --git a/drivers/serial/jsm/jsm.h b/drivers/serial/jsm/jsm.h
index 043f50b..12c934a 100644
--- a/drivers/serial/jsm/jsm.h
+++ b/drivers/serial/jsm/jsm.h
@@ -99,7 +99,7 @@ struct jsm_channel;
  * Per board operations structure					*
  ************************************************************************/
 struct board_ops {
-	irqreturn_t (*intr) (int irq, void *voidbrd, struct pt_regs *regs);
+	irq_handler_t intr;
 	void (*uart_init) (struct jsm_channel *ch);
 	void (*uart_off) (struct jsm_channel *ch);
 	void (*param) (struct jsm_channel *ch);
diff --git a/drivers/serial/jsm/jsm_neo.c b/drivers/serial/jsm/jsm_neo.c
index a5fc589..8fa31e6 100644
--- a/drivers/serial/jsm/jsm_neo.c
+++ b/drivers/serial/jsm/jsm_neo.c
@@ -1114,7 +1114,7 @@ static void neo_param(struct jsm_channel *ch)
  *
  * Neo specific interrupt handler.
  */
-static irqreturn_t neo_intr(int irq, void *voidbrd, struct pt_regs *regs)
+static irqreturn_t neo_intr(int irq, void *voidbrd)
 {
 	struct jsm_board *brd = (struct jsm_board *) voidbrd;
 	struct jsm_channel *ch;
diff --git a/drivers/serial/m32r_sio.c b/drivers/serial/m32r_sio.c
index 28c9ce6..c85ac1a 100644
--- a/drivers/serial/m32r_sio.c
+++ b/drivers/serial/m32r_sio.c
@@ -323,8 +323,7 @@ static void m32r_sio_enable_ms(struct uart_port *port)
 	serial_out(up, UART_IER, up->ier);
 }
 
-static void receive_chars(struct uart_sio_port *up, int *status,
-			  struct pt_regs *regs)
+static void receive_chars(struct uart_sio_port *up, int *status)
 {
 	struct tty_struct *tty = up->port.info->tty;
 	unsigned char ch;
@@ -378,7 +377,7 @@ static void receive_chars(struct uart_sio_port *up, int *status,
 			else if (*status & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 		if ((*status & up->port.ignore_status_mask) == 0)
 			tty_insert_flip_char(tty, ch, flag);
@@ -439,12 +438,12 @@ static void transmit_chars(struct uart_sio_port *up)
  * This handles the interrupt from one port.
  */
 static inline void m32r_sio_handle_port(struct uart_sio_port *up,
-	unsigned int status, struct pt_regs *regs)
+	unsigned int status)
 {
 	DEBUG_INTR("status = %x...", status);
 
 	if (status & 0x04)
-		receive_chars(up, &status, regs);
+		receive_chars(up, &status);
 	if (status & 0x01)
 		transmit_chars(up);
 }
@@ -463,8 +462,7 @@ static inline void m32r_sio_handle_port(struct uart_sio_port *up,
  * This means we need to loop through all ports. checking that they
  * don't have an interrupt pending.
  */
-static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id,
-	struct pt_regs *regs)
+static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
 {
 	struct irq_info *i = dev_id;
 	struct list_head *l, *end = NULL;
@@ -492,7 +490,7 @@ static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id,
 		sts = sio_in(up, SIOSTS);
 		if (sts & 0x5) {
 			spin_lock(&up->port.lock);
-			m32r_sio_handle_port(up, sts, regs);
+			m32r_sio_handle_port(up, sts);
 			spin_unlock(&up->port.lock);
 
 			end = NULL;
diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c
index 00d7859..aee1b31 100644
--- a/drivers/serial/mcfserial.c
+++ b/drivers/serial/mcfserial.c
@@ -385,7 +385,7 @@ static inline void transmit_chars(struct mcf_serial *info)
 /*
  * This is the serial driver's generic interrupt routine
  */
-irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t mcfrs_interrupt(int irq, void *dev_id)
 {
 	struct mcf_serial	*info;
 	unsigned char		isr;
diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index dbad0e3..039c2fd 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -85,7 +85,7 @@ static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
 
 
 /* Forward declaration of the interruption handling routine */
-static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id,struct pt_regs *regs);
+static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id);
 
 
 /* Simple macro to test if a port is console or not. This one is taken
@@ -410,7 +410,7 @@ static struct uart_ops mpc52xx_uart_ops = {
 /* ======================================================================== */
 	
 static inline int
-mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs)
+mpc52xx_uart_int_rx_chars(struct uart_port *port)
 {
 	struct tty_struct *tty = port->info->tty;
 	unsigned char ch, flag;
@@ -425,7 +425,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs)
 
 		/* Handle sysreq char */
 #ifdef SUPPORT_SYSRQ
-		if (uart_handle_sysrq_char(port, ch, regs)) {
+		if (uart_handle_sysrq_char(port, ch)) {
 			port->sysrq = 0;
 			continue;
 		}
@@ -510,7 +510,7 @@ mpc52xx_uart_int_tx_chars(struct uart_port *port)
 }
 
 static irqreturn_t 
-mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs)
+mpc52xx_uart_int(int irq, void *dev_id)
 {
 	struct uart_port *port = (struct uart_port *) dev_id;
 	unsigned long pass = ISR_PASS_LIMIT;
@@ -539,7 +539,7 @@ mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs)
 		/* Do we need to receive chars ? */
 		/* For this RX interrupts must be on and some chars waiting */
 		if ( status & MPC52xx_PSC_IMR_RXRDY )
-			keepgoing |= mpc52xx_uart_int_rx_chars(port, regs);
+			keepgoing |= mpc52xx_uart_int_rx_chars(port);
 
 		/* Do we need to send chars ? */
 		/* For this, TX must be ready and TX interrupt enabled */
diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index 704243c..8eea69f 100644
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -992,7 +992,7 @@ mpsc_make_ready(struct mpsc_port_info *pi)
  */
 
 static inline int
-mpsc_rx_intr(struct mpsc_port_info *pi, struct pt_regs *regs)
+mpsc_rx_intr(struct mpsc_port_info *pi)
 {
 	struct mpsc_rx_desc *rxre;
 	struct tty_struct *tty = pi->port.info->tty;
@@ -1072,7 +1072,7 @@ mpsc_rx_intr(struct mpsc_port_info *pi, struct pt_regs *regs)
 				flag = TTY_PARITY;
 		}
 
-		if (uart_handle_sysrq_char(&pi->port, *bp, regs)) {
+		if (uart_handle_sysrq_char(&pi->port, *bp)) {
 			bp++;
 			bytes_in--;
 			goto next_frame;
@@ -1257,7 +1257,7 @@ mpsc_tx_intr(struct mpsc_port_info *pi)
  * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
  */
 static irqreturn_t
-mpsc_sdma_intr(int irq, void *dev_id, struct pt_regs *regs)
+mpsc_sdma_intr(int irq, void *dev_id)
 {
 	struct mpsc_port_info *pi = dev_id;
 	ulong iflags;
@@ -1267,7 +1267,7 @@ mpsc_sdma_intr(int irq, void *dev_id, struct pt_regs *regs)
 
 	spin_lock_irqsave(&pi->port.lock, iflags);
 	mpsc_sdma_intr_ack(pi);
-	if (mpsc_rx_intr(pi, regs))
+	if (mpsc_rx_intr(pi))
 		rc = IRQ_HANDLED;
 	if (mpsc_tx_intr(pi))
 		rc = IRQ_HANDLED;
diff --git a/drivers/serial/netx-serial.c b/drivers/serial/netx-serial.c
index 7502109..e92d7e1 100644
--- a/drivers/serial/netx-serial.c
+++ b/drivers/serial/netx-serial.c
@@ -200,7 +200,7 @@ static void netx_txint(struct uart_port *port)
 		uart_write_wakeup(port);
 }
 
-static void netx_rxint(struct uart_port *port, struct pt_regs *regs)
+static void netx_rxint(struct uart_port *port)
 {
 	unsigned char rx, flg, status;
 	struct tty_struct *tty = port->info->tty;
@@ -235,7 +235,7 @@ static void netx_rxint(struct uart_port *port, struct pt_regs *regs)
 				flg = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(port, rx, regs))
+		if (uart_handle_sysrq_char(port, rx))
 			continue;
 
 		uart_insert_char(port, status, SR_OE, rx, flg);
@@ -245,7 +245,7 @@ static void netx_rxint(struct uart_port *port, struct pt_regs *regs)
 	return;
 }
 
-static irqreturn_t netx_int(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t netx_int(int irq, void *dev_id)
 {
 	struct uart_port *port = (struct uart_port *)dev_id;
 	unsigned long flags;
@@ -256,7 +256,7 @@ static irqreturn_t netx_int(int irq, void *dev_id, struct pt_regs *regs)
 	status = readl(port->membase + UART_IIR) & IIR_MASK;
 	while (status) {
 		if (status & IIR_RIS)
-			netx_rxint(port, regs);
+			netx_rxint(port);
 		if (status & IIR_TIS)
 			netx_txint(port);
 		if (status & IIR_MIS) {
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index a3b99ca..bf9809e 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -204,8 +204,7 @@ static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
 	}
 }
 
-static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap,
-					    struct pt_regs *regs)
+static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
 {
 	struct tty_struct *tty = NULL;
 	unsigned char ch, r1, drop, error, flag;
@@ -267,7 +266,7 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap,
 		if (uap->port.sysrq) {
 			int swallow;
 			spin_unlock(&uap->port.lock);
-			swallow = uart_handle_sysrq_char(&uap->port, ch, regs);
+			swallow = uart_handle_sysrq_char(&uap->port, ch);
 			spin_lock(&uap->port.lock);
 			if (swallow)
 				goto next_char;
@@ -335,7 +334,7 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap,
 	return tty;
 }
 
-static void pmz_status_handle(struct uart_pmac_port *uap, struct pt_regs *regs)
+static void pmz_status_handle(struct uart_pmac_port *uap)
 {
 	unsigned char status;
 
@@ -438,7 +437,7 @@ ack_tx_int:
 }
 
 /* Hrm... we register that twice, fixme later.... */
-static irqreturn_t pmz_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t pmz_interrupt(int irq, void *dev_id)
 {
 	struct uart_pmac_port *uap = dev_id;
 	struct uart_pmac_port *uap_a;
@@ -462,9 +461,9 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		write_zsreg(uap_a, R0, RES_H_IUS);
 		zssync(uap_a);		
        		if (r3 & CHAEXT)
-       			pmz_status_handle(uap_a, regs);
+       			pmz_status_handle(uap_a);
 		if (r3 & CHARxIP)
-			tty = pmz_receive_chars(uap_a, regs);
+			tty = pmz_receive_chars(uap_a);
        		if (r3 & CHATxIP)
        			pmz_transmit_chars(uap_a);
 	        rc = IRQ_HANDLED;
@@ -482,9 +481,9 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		write_zsreg(uap_b, R0, RES_H_IUS);
 		zssync(uap_b);
        		if (r3 & CHBEXT)
-       			pmz_status_handle(uap_b, regs);
+       			pmz_status_handle(uap_b);
        	       	if (r3 & CHBRxIP)
-       			tty = pmz_receive_chars(uap_b, regs);
+       			tty = pmz_receive_chars(uap_b);
        		if (r3 & CHBTxIP)
        			pmz_transmit_chars(uap_b);
 	       	rc = IRQ_HANDLED;
diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c
index a720953..846089f 100644
--- a/drivers/serial/pxa.c
+++ b/drivers/serial/pxa.c
@@ -98,8 +98,7 @@ static void serial_pxa_stop_rx(struct uart_port *port)
 	serial_out(up, UART_IER, up->ier);
 }
 
-static inline void
-receive_chars(struct uart_pxa_port *up, int *status, struct pt_regs *regs)
+static inline void receive_chars(struct uart_pxa_port *up, int *status)
 {
 	struct tty_struct *tty = up->port.info->tty;
 	unsigned int ch, flag;
@@ -153,7 +152,7 @@ receive_chars(struct uart_pxa_port *up, int *status, struct pt_regs *regs)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 
 		uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
@@ -231,8 +230,7 @@ static inline void check_modem_status(struct uart_pxa_port *up)
 /*
  * This handles the interrupt from one port.
  */
-static inline irqreturn_t
-serial_pxa_irq(int irq, void *dev_id, struct pt_regs *regs)
+static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
 {
 	struct uart_pxa_port *up = (struct uart_pxa_port *)dev_id;
 	unsigned int iir, lsr;
@@ -242,7 +240,7 @@ serial_pxa_irq(int irq, void *dev_id, struct pt_regs *regs)
 		return IRQ_NONE;
 	lsr = serial_in(up, UART_LSR);
 	if (lsr & UART_LSR_DR)
-		receive_chars(up, &lsr, regs);
+		receive_chars(up, &lsr);
 	check_modem_status(up);
 	if (lsr & UART_LSR_THRE)
 		transmit_chars(up);
diff --git a/drivers/serial/s3c2410.c b/drivers/serial/s3c2410.c
index 95738a1..8dfc2dd 100644
--- a/drivers/serial/s3c2410.c
+++ b/drivers/serial/s3c2410.c
@@ -310,7 +310,7 @@ static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
 #define S3C2410_UERSTAT_PARITY (0x1000)
 
 static irqreturn_t
-s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
+s3c24xx_serial_rx_chars(int irq, void *dev_id)
 {
 	struct s3c24xx_uart_port *ourport = dev_id;
 	struct uart_port *port = &ourport->port;
@@ -379,7 +379,7 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(port, ch, regs))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
 		uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag);
@@ -393,7 +393,7 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs)
+static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 {
 	struct s3c24xx_uart_port *ourport = id;
 	struct uart_port *port = &ourport->port;
diff --git a/drivers/serial/sa1100.c b/drivers/serial/sa1100.c
index db3486d..d406526 100644
--- a/drivers/serial/sa1100.c
+++ b/drivers/serial/sa1100.c
@@ -190,7 +190,7 @@ static void sa1100_enable_ms(struct uart_port *port)
 }
 
 static void
-sa1100_rx_chars(struct sa1100_port *sport, struct pt_regs *regs)
+sa1100_rx_chars(struct sa1100_port *sport)
 {
 	struct tty_struct *tty = sport->port.info->tty;
 	unsigned int status, ch, flg;
@@ -228,7 +228,7 @@ sa1100_rx_chars(struct sa1100_port *sport, struct pt_regs *regs)
 #endif
 		}
 
-		if (uart_handle_sysrq_char(&sport->port, ch, regs))
+		if (uart_handle_sysrq_char(&sport->port, ch))
 			goto ignore_char;
 
 		uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
@@ -281,7 +281,7 @@ static void sa1100_tx_chars(struct sa1100_port *sport)
 		sa1100_stop_tx(&sport->port);
 }
 
-static irqreturn_t sa1100_int(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sa1100_int(int irq, void *dev_id)
 {
 	struct sa1100_port *sport = dev_id;
 	unsigned int status, pass_counter = 0;
@@ -294,7 +294,7 @@ static irqreturn_t sa1100_int(int irq, void *dev_id, struct pt_regs *regs)
 			/* Clear the receiver idle bit, if set */
 			if (status & UTSR0_RID)
 				UART_PUT_UTSR0(sport, UTSR0_RID);
-			sa1100_rx_chars(sport, regs);
+			sa1100_rx_chars(sport);
 		}
 
 		/* Clear the relevant break bits */
diff --git a/drivers/serial/serial_lh7a40x.c b/drivers/serial/serial_lh7a40x.c
index 23ddedb..5e1ac35 100644
--- a/drivers/serial/serial_lh7a40x.c
+++ b/drivers/serial/serial_lh7a40x.c
@@ -135,12 +135,7 @@ static void lh7a40xuart_enable_ms (struct uart_port* port)
 	BIT_SET (port, UART_R_INTEN, ModemInt);
 }
 
-static void
-#ifdef SUPPORT_SYSRQ
-lh7a40xuart_rx_chars (struct uart_port* port, struct pt_regs* regs)
-#else
-lh7a40xuart_rx_chars (struct uart_port* port)
-#endif
+static void lh7a40xuart_rx_chars (struct uart_port* port)
 {
 	struct tty_struct* tty = port->info->tty;
 	int cbRxMax = 256;	/* (Gross) limit on receive */
@@ -177,7 +172,7 @@ lh7a40xuart_rx_chars (struct uart_port* port)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char (port, (unsigned char) data, regs))
+		if (uart_handle_sysrq_char (port, (unsigned char) data))
 			continue;
 
 		uart_insert_char(port, data, RxOverrunError, data, flag);
@@ -248,8 +243,7 @@ static void lh7a40xuart_modem_status (struct uart_port* port)
 	wake_up_interruptible (&port->info->delta_msr_wait);
 }
 
-static irqreturn_t lh7a40xuart_int (int irq, void* dev_id,
-				    struct pt_regs* regs)
+static irqreturn_t lh7a40xuart_int (int irq, void* dev_id)
 {
 	struct uart_port* port = dev_id;
 	unsigned int cLoopLimit = ISR_LOOP_LIMIT;
@@ -258,11 +252,7 @@ static irqreturn_t lh7a40xuart_int (int irq, void* dev_id,
 
 	do {
 		if (isr & (RxInt | RxTimeoutInt))
-#ifdef SUPPORT_SYSRQ
-			lh7a40xuart_rx_chars(port, regs);
-#else
 			lh7a40xuart_rx_chars(port);
-#endif
 		if (isr & ModemInt)
 			lh7a40xuart_modem_status (port);
 		if (isr & TxInt)
diff --git a/drivers/serial/serial_txx9.c b/drivers/serial/serial_txx9.c
index ebd8d2b..2a48289 100644
--- a/drivers/serial/serial_txx9.c
+++ b/drivers/serial/serial_txx9.c
@@ -283,7 +283,7 @@ static void serial_txx9_enable_ms(struct uart_port *port)
 }
 
 static inline void
-receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *regs)
+receive_chars(struct uart_txx9_port *up, unsigned int *status)
 {
 	struct tty_struct *tty = up->port.info->tty;
 	unsigned char ch;
@@ -344,7 +344,7 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *r
 			else if (disr & TXX9_SIDISR_UFER)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 
 		uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
@@ -391,7 +391,7 @@ static inline void transmit_chars(struct uart_txx9_port *up)
 		serial_txx9_stop_tx(&up->port);
 }
 
-static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 {
 	int pass_counter = 0;
 	struct uart_txx9_port *up = dev_id;
@@ -409,7 +409,7 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id, struct pt_regs *
 		}
 
 		if (status & TXX9_SIDISR_RDIS)
-			receive_chars(up, &status, regs);
+			receive_chars(up, &status);
 		if (status & TXX9_SIDISR_TDIS)
 			transmit_chars(up);
 		/* Clear TX/RX Int. Status */
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 5c025d1..266aa32 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -446,8 +446,7 @@ static void sci_transmit_chars(struct uart_port *port)
 /* On SH3, SCIF may read end-of-break as a space->mark char */
 #define STEPFN(c)  ({int __c=(c); (((__c-1)|(__c)) == -1); })
 
-static inline void sci_receive_chars(struct uart_port *port,
-				     struct pt_regs *regs)
+static inline void sci_receive_chars(struct uart_port *port)
 {
 	struct sci_port *sci_port = (struct sci_port *)port;
 	struct tty_struct *tty = port->info->tty;
@@ -476,7 +475,7 @@ static inline void sci_receive_chars(struct uart_port *port,
 
 		if (port->type == PORT_SCI) {
 			char c = sci_in(port, SCxRDR);
-			if (uart_handle_sysrq_char(port, c, regs) || sci_port->break_flag)
+			if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
 				count = 0;
 			else {
 				tty_insert_flip_char(tty, c, TTY_NORMAL);
@@ -504,7 +503,7 @@ static inline void sci_receive_chars(struct uart_port *port,
 					}
 				}
 #endif /* CONFIG_CPU_SH3 */
-				if (uart_handle_sysrq_char(port, c, regs)) {
+				if (uart_handle_sysrq_char(port, c)) {
 					count--; i--;
 					continue;
 				}
@@ -652,18 +651,18 @@ static inline int sci_handle_breaks(struct uart_port *port)
 	return copied;
 }
 
-static irqreturn_t sci_rx_interrupt(int irq, void *port, struct pt_regs *regs)
+static irqreturn_t sci_rx_interrupt(int irq, void *port)
 {
 	/* I think sci_receive_chars has to be called irrespective
 	 * of whether the I_IXOFF is set, otherwise, how is the interrupt
 	 * to be disabled?
 	 */
-	sci_receive_chars(port, regs);
+	sci_receive_chars(port);
 
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
+static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
 {
 	struct uart_port *port = ptr;
 
@@ -674,7 +673,7 @@ static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
+static irqreturn_t sci_er_interrupt(int irq, void *ptr)
 {
 	struct uart_port *port = ptr;
 
@@ -696,18 +695,18 @@ static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
 			pr_debug("scif: overrun error\n");
 		}
 #endif
-		sci_rx_interrupt(irq, ptr, regs);
+		sci_rx_interrupt(irq, ptr);
 	}
 
 	sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
 
 	/* Kick the transmission */
-	sci_tx_interrupt(irq, ptr, regs);
+	sci_tx_interrupt(irq, ptr);
 
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t sci_br_interrupt(int irq, void *ptr, struct pt_regs *regs)
+static irqreturn_t sci_br_interrupt(int irq, void *ptr)
 {
 	struct uart_port *port = ptr;
 
@@ -724,7 +723,7 @@ static irqreturn_t sci_br_interrupt(int irq, void *ptr, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr, struct pt_regs *regs)
+static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 {
         unsigned short ssr_status, scr_status;
         struct uart_port *port = ptr;
@@ -734,16 +733,16 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr, struct pt_regs *regs)
 
 	/* Tx Interrupt */
         if ((ssr_status & 0x0020) && (scr_status & 0x0080))
-                sci_tx_interrupt(irq, ptr, regs);
+                sci_tx_interrupt(irq, ptr);
 	/* Rx Interrupt */
         if ((ssr_status & 0x0002) && (scr_status & 0x0040))
-                sci_rx_interrupt(irq, ptr, regs);
+                sci_rx_interrupt(irq, ptr);
 	/* Error Interrupt */
         if ((ssr_status & 0x0080) && (scr_status & 0x0400))
-                sci_er_interrupt(irq, ptr, regs);
+                sci_er_interrupt(irq, ptr);
 	/* Break Interrupt */
         if ((ssr_status & 0x0010) && (scr_status & 0x0200))
-                sci_br_interrupt(irq, ptr, regs);
+                sci_br_interrupt(irq, ptr);
 
 	return IRQ_HANDLED;
 }
@@ -795,7 +794,7 @@ static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
 static int sci_request_irq(struct sci_port *port)
 {
 	int i;
-	irqreturn_t (*handlers[4])(int irq, void *ptr, struct pt_regs *regs) = {
+	irqreturn_t (*handlers[4])(int irq, void *ptr) = {
 		sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
 		sci_br_interrupt,
 	};
diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c
index 2f148e5..709f93a 100644
--- a/drivers/serial/sn_console.c
+++ b/drivers/serial/sn_console.c
@@ -447,7 +447,6 @@ static int sn_debug_printf(const char *fmt, ...)
 /**
  * sn_receive_chars - Grab characters, pass them to tty layer
  * @port: Port to operate on
- * @regs: Saved registers (needed by uart_handle_sysrq_char)
  * @flags: irq flags
  *
  * Note: If we're not registered with the serial core infrastructure yet,
@@ -455,8 +454,7 @@ static int sn_debug_printf(const char *fmt, ...)
  *
  */
 static void
-sn_receive_chars(struct sn_cons_port *port, struct pt_regs *regs,
-		 unsigned long flags)
+sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 {
 	int ch;
 	struct tty_struct *tty;
@@ -494,7 +492,7 @@ sn_receive_chars(struct sn_cons_port *port, struct pt_regs *regs,
                         sysrq_requested = 0;
                         if (ch && time_before(jiffies, sysrq_timeout)) {
                                 spin_unlock_irqrestore(&port->sc_port.lock, flags);
-                                handle_sysrq(ch, regs, NULL);
+                                handle_sysrq(ch, NULL);
                                 spin_lock_irqsave(&port->sc_port.lock, flags);
                                 /* ignore actual sysrq command char */
                                 continue;
@@ -615,10 +613,9 @@ static void sn_transmit_chars(struct sn_cons_port *port, int raw)
  * sn_sal_interrupt - Handle console interrupts
  * @irq: irq #, useful for debug statements
  * @dev_id: our pointer to our port (sn_cons_port which contains the uart port)
- * @regs: Saved registers, used by sn_receive_chars for uart_handle_sysrq_char
  *
  */
-static irqreturn_t sn_sal_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sn_sal_interrupt(int irq, void *dev_id)
 {
 	struct sn_cons_port *port = (struct sn_cons_port *)dev_id;
 	unsigned long flags;
@@ -629,7 +626,7 @@ static irqreturn_t sn_sal_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	spin_lock_irqsave(&port->sc_port.lock, flags);
 	if (status & SAL_CONSOLE_INTR_RECV) {
-		sn_receive_chars(port, regs, flags);
+		sn_receive_chars(port, flags);
 	}
 	if (status & SAL_CONSOLE_INTR_XMIT) {
 		sn_transmit_chars(port, TRANSMIT_BUFFERED);
diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
index f851f0f..03941d2 100644
--- a/drivers/serial/sunhv.c
+++ b/drivers/serial/sunhv.c
@@ -73,7 +73,7 @@ static inline long hypervisor_con_putchar(long ch)
 
 static int hung_up = 0;
 
-static struct tty_struct *receive_chars(struct uart_port *port, struct pt_regs *regs)
+static struct tty_struct *receive_chars(struct uart_port *port)
 {
 	struct tty_struct *tty = NULL;
 	int saw_console_brk = 0;
@@ -106,7 +106,7 @@ static struct tty_struct *receive_chars(struct uart_port *port, struct pt_regs *
 		}
 
 		if (tty == NULL) {
-			uart_handle_sysrq_char(port, c, regs);
+			uart_handle_sysrq_char(port, c);
 			continue;
 		}
 
@@ -119,7 +119,7 @@ static struct tty_struct *receive_chars(struct uart_port *port, struct pt_regs *
 			flag = TTY_BREAK;
 		}
 
-		if (uart_handle_sysrq_char(port, c, regs))
+		if (uart_handle_sysrq_char(port, c))
 			continue;
 
 		if ((port->ignore_status_mask & IGNORE_ALL) ||
@@ -161,14 +161,14 @@ static void transmit_chars(struct uart_port *port)
 		uart_write_wakeup(port);
 }
 
-static irqreturn_t sunhv_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
 	struct tty_struct *tty;
 	unsigned long flags;
 
 	spin_lock_irqsave(&port->lock, flags);
-	tty = receive_chars(port, regs);
+	tty = receive_chars(port);
 	transmit_chars(port);
 	spin_unlock_irqrestore(&port->lock, flags);
 
diff --git a/drivers/serial/sunsab.c b/drivers/serial/sunsab.c
index cfe20f7..08a7cd6 100644
--- a/drivers/serial/sunsab.c
+++ b/drivers/serial/sunsab.c
@@ -108,8 +108,7 @@ static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
 
 static struct tty_struct *
 receive_chars(struct uart_sunsab_port *up,
-	      union sab82532_irq_status *stat,
-	      struct pt_regs *regs)
+	      union sab82532_irq_status *stat)
 {
 	struct tty_struct *tty = NULL;
 	unsigned char buf[32];
@@ -161,7 +160,7 @@ receive_chars(struct uart_sunsab_port *up,
 		unsigned char ch = buf[i], flag;
 
 		if (tty == NULL) {
-			uart_handle_sysrq_char(&up->port, ch, regs);
+			uart_handle_sysrq_char(&up->port, ch);
 			continue;
 		}
 
@@ -208,7 +207,7 @@ receive_chars(struct uart_sunsab_port *up,
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			continue;
 
 		if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
@@ -301,7 +300,7 @@ static void check_status(struct uart_sunsab_port *up,
 	wake_up_interruptible(&up->port.info->delta_msr_wait);
 }
 
-static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 {
 	struct uart_sunsab_port *up = dev_id;
 	struct tty_struct *tty;
@@ -321,7 +320,7 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
 					 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_BRK))
-			tty = receive_chars(up, &status, regs);
+			tty = receive_chars(up, &status);
 		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_CSC))
 			check_status(up, &status);
@@ -350,7 +349,7 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 					 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_BRK))
 
-			tty = receive_chars(up, &status, regs);
+			tty = receive_chars(up, &status);
 		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 		    (status.sreg.isr1 & (SAB82532_ISR1_BRK | SAB82532_ISR1_CSC)))
 			check_status(up, &status);
diff --git a/drivers/serial/sunsu.c b/drivers/serial/sunsu.c
index 9b3b9aa..c577fae 100644
--- a/drivers/serial/sunsu.c
+++ b/drivers/serial/sunsu.c
@@ -310,7 +310,7 @@ static void sunsu_enable_ms(struct uart_port *port)
 }
 
 static struct tty_struct *
-receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs *regs)
+receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 {
 	struct tty_struct *tty = up->port.info->tty;
 	unsigned char ch, flag;
@@ -367,7 +367,7 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs
 			else if (*status & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 		if ((*status & up->port.ignore_status_mask) == 0)
 			tty_insert_flip_char(tty, ch, flag);
@@ -445,7 +445,7 @@ static void check_modem_status(struct uart_sunsu_port *up)
 	wake_up_interruptible(&up->port.info->delta_msr_wait);
 }
 
-static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
 {
 	struct uart_sunsu_port *up = dev_id;
 	unsigned long flags;
@@ -459,7 +459,7 @@ static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id, struct pt_regs
 		status = serial_inp(up, UART_LSR);
 		tty = NULL;
 		if (status & UART_LSR_DR)
-			tty = receive_chars(up, &status, regs);
+			tty = receive_chars(up, &status);
 		check_modem_status(up);
 		if (status & UART_LSR_THRE)
 			transmit_chars(up);
@@ -497,7 +497,7 @@ static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
 	sunsu_change_speed(&up->port, up->cflag, 0, quot);
 }
 
-static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *regs, int is_break)
+static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
 {
 	do {
 		unsigned char ch = serial_inp(up, UART_RX);
@@ -505,7 +505,7 @@ static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *reg
 		/* Stop-A is handled by drivers/char/keyboard.c now. */
 		if (up->su_type == SU_PORT_KBD) {
 #ifdef CONFIG_SERIO
-			serio_interrupt(&up->serio, ch, 0, regs);
+			serio_interrupt(&up->serio, ch, 0);
 #endif
 		} else if (up->su_type == SU_PORT_MS) {
 			int ret = suncore_mouse_baud_detection(ch, is_break);
@@ -519,7 +519,7 @@ static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *reg
 
 			case 0:
 #ifdef CONFIG_SERIO
-				serio_interrupt(&up->serio, ch, 0, regs);
+				serio_interrupt(&up->serio, ch, 0);
 #endif
 				break;
 			};
@@ -527,7 +527,7 @@ static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *reg
 	} while (serial_in(up, UART_LSR) & UART_LSR_DR);
 }
 
-static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
 {
 	struct uart_sunsu_port *up = dev_id;
 
@@ -535,8 +535,7 @@ static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id, struct pt_regs
 		unsigned char status = serial_inp(up, UART_LSR);
 
 		if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
-			receive_kbd_ms_chars(up, regs,
-					     (status & UART_LSR_BI) != 0);
+			receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
 	}
 
 	return IRQ_HANDLED;
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index 0da3ebf..b11f6de 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -277,14 +277,13 @@ static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
 }
 
 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
-					 unsigned char ch, int is_break,
-					 struct pt_regs *regs)
+					 unsigned char ch, int is_break)
 {
 	if (ZS_IS_KEYB(up)) {
 		/* Stop-A is handled by drivers/char/keyboard.c now. */
 #ifdef CONFIG_SERIO
 		if (up->serio_open)
-			serio_interrupt(&up->serio, ch, 0, regs);
+			serio_interrupt(&up->serio, ch, 0);
 #endif
 	} else if (ZS_IS_MOUSE(up)) {
 		int ret = suncore_mouse_baud_detection(ch, is_break);
@@ -299,7 +298,7 @@ static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
 		case 0:
 #ifdef CONFIG_SERIO
 			if (up->serio_open)
-				serio_interrupt(&up->serio, ch, 0, regs);
+				serio_interrupt(&up->serio, ch, 0);
 #endif
 			break;
 		};
@@ -308,8 +307,7 @@ static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
 
 static struct tty_struct *
 sunzilog_receive_chars(struct uart_sunzilog_port *up,
-		       struct zilog_channel __iomem *channel,
-		       struct pt_regs *regs)
+		       struct zilog_channel __iomem *channel)
 {
 	struct tty_struct *tty;
 	unsigned char ch, r1, flag;
@@ -346,12 +344,12 @@ sunzilog_receive_chars(struct uart_sunzilog_port *up,
 		ch &= up->parity_mask;
 
 		if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
-			sunzilog_kbdms_receive_chars(up, ch, 0, regs);
+			sunzilog_kbdms_receive_chars(up, ch, 0);
 			continue;
 		}
 
 		if (tty == NULL) {
-			uart_handle_sysrq_char(&up->port, ch, regs);
+			uart_handle_sysrq_char(&up->port, ch);
 			continue;
 		}
 
@@ -379,7 +377,7 @@ sunzilog_receive_chars(struct uart_sunzilog_port *up,
 			else if (r1 & CRC_ERR)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch, regs))
+		if (uart_handle_sysrq_char(&up->port, ch))
 			continue;
 
 		if (up->port.ignore_status_mask == 0xff ||
@@ -394,8 +392,7 @@ sunzilog_receive_chars(struct uart_sunzilog_port *up,
 }
 
 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
-				   struct zilog_channel __iomem *channel,
-				   struct pt_regs *regs)
+				   struct zilog_channel __iomem *channel)
 {
 	unsigned char status;
 
@@ -408,7 +405,7 @@ static void sunzilog_status_handle(struct uart_sunzilog_port *up,
 
 	if (status & BRK_ABRT) {
 		if (ZS_IS_MOUSE(up))
-			sunzilog_kbdms_receive_chars(up, 0, 1, regs);
+			sunzilog_kbdms_receive_chars(up, 0, 1);
 		if (ZS_IS_CONS(up)) {
 			/* Wait for BREAK to deassert to avoid potentially
 			 * confusing the PROM.
@@ -517,7 +514,7 @@ ack_tx_int:
 	ZS_WSYNC(channel);
 }
 
-static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
 {
 	struct uart_sunzilog_port *up = dev_id;
 
@@ -538,9 +535,9 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *reg
 			ZS_WSYNC(channel);
 
 			if (r3 & CHARxIP)
-				tty = sunzilog_receive_chars(up, channel, regs);
+				tty = sunzilog_receive_chars(up, channel);
 			if (r3 & CHAEXT)
-				sunzilog_status_handle(up, channel, regs);
+				sunzilog_status_handle(up, channel);
 			if (r3 & CHATxIP)
 				sunzilog_transmit_chars(up, channel);
 		}
@@ -561,9 +558,9 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *reg
 			ZS_WSYNC(channel);
 
 			if (r3 & CHBRxIP)
-				tty = sunzilog_receive_chars(up, channel, regs);
+				tty = sunzilog_receive_chars(up, channel);
 			if (r3 & CHBEXT)
-				sunzilog_status_handle(up, channel, regs);
+				sunzilog_status_handle(up, channel);
 			if (r3 & CHBTxIP)
 				sunzilog_transmit_chars(up, channel);
 		}
diff --git a/drivers/serial/v850e_uart.c b/drivers/serial/v850e_uart.c
index f802867..28f3bbf 100644
--- a/drivers/serial/v850e_uart.c
+++ b/drivers/serial/v850e_uart.c
@@ -271,14 +271,14 @@ void v850e_uart_tx (struct uart_port *port)
 		v850e_uart_stop_tx (port, stopped);
 }
 
-static irqreturn_t v850e_uart_tx_irq(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t v850e_uart_tx_irq(int irq, void *data)
 {
 	struct uart_port *port = data;
 	v850e_uart_tx (port);
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t v850e_uart_rx_irq(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t v850e_uart_rx_irq(int irq, void *data)
 {
 	struct uart_port *port = data;
 	unsigned ch_stat = TTY_NORMAL;
diff --git a/drivers/serial/vr41xx_siu.c b/drivers/serial/vr41xx_siu.c
index 6c8b0ea..fd51f81 100644
--- a/drivers/serial/vr41xx_siu.c
+++ b/drivers/serial/vr41xx_siu.c
@@ -359,8 +359,7 @@ static void siu_break_ctl(struct uart_port *port, int ctl)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
-static inline void receive_chars(struct uart_port *port, uint8_t *status,
-                                 struct pt_regs *regs)
+static inline void receive_chars(struct uart_port *port, uint8_t *status)
 {
 	struct tty_struct *tty;
 	uint8_t lsr, ch;
@@ -405,7 +404,7 @@ static inline void receive_chars(struct uart_port *port, uint8_t *status,
 				flag = TTY_PARITY;
 		}
 
-		if (uart_handle_sysrq_char(port, ch, regs))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
 		uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
@@ -472,7 +471,7 @@ static inline void transmit_chars(struct uart_port *port)
 		siu_stop_tx(port);
 }
 
-static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t siu_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port;
 	uint8_t iir, lsr;
@@ -485,7 +484,7 @@ static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	lsr = siu_read(port, UART_LSR);
 	if (lsr & UART_LSR_DR)
-		receive_chars(port, &lsr, regs);
+		receive_chars(port, &lsr);
 
 	check_modem_status(port);