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-rw-r--r--arch/sh/Kconfig.debug8
-rw-r--r--arch/sh/kernel/irq.c8
-rw-r--r--include/asm-sh/irq.h2
3 files changed, 13 insertions, 5 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index b507b50..ab2f9f3 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -86,6 +86,14 @@ config 4KSTACKS
on the VM subsystem for higher order allocations. This option
will also use IRQ stacks to compensate for the reduced stackspace.
+config IRQSTACKS
+ bool "Use separate kernel stacks when processing interrupts"
+ depends on DEBUG_KERNEL
+ help
+ If you say Y here the kernel will use separate kernel stacks
+ for handling hard and soft interrupts. This can help avoid
+ overflowing the process kernel stacks.
+
config SH_KGDB
bool "Include KGDB kernel debugger"
select FRAME_POINTER
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 4b49d03..348da19 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -69,7 +69,7 @@ unlock:
}
#endif
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
/*
* per-CPU IRQ handling contexts (thread information and stack)
*/
@@ -85,7 +85,7 @@ static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
union irq_ctx *curctx, *irqctx;
#endif
@@ -109,7 +109,7 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
irq = irq_demux(evt2irq(irq));
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
curctx = (union irq_ctx *)current_thread_info();
irqctx = hardirq_ctx[smp_processor_id()];
@@ -157,7 +157,7 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
return 1;
}
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
static char softirq_stack[NR_CPUS * THREAD_SIZE]
__attribute__((__section__(".bss.page_aligned")));
diff --git a/include/asm-sh/irq.h b/include/asm-sh/irq.h
index c61d902..11850f6 100644
--- a/include/asm-sh/irq.h
+++ b/include/asm-sh/irq.h
@@ -41,7 +41,7 @@ static inline int generic_irq_demux(int irq)
#define irq_canonicalize(irq) (irq)
#define irq_demux(irq) sh_mv.mv_irq_demux(irq)
-#ifdef CONFIG_4KSTACKS
+#ifdef CONFIG_IRQSTACKS
extern void irq_ctx_init(int cpu);
extern void irq_ctx_exit(int cpu);
# define __ARCH_HAS_DO_SOFTIRQ
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