Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

Pull tile arch changes from Chris Metcalf:
 "These are some minor new feature work and other changes that didn't
  merit getting pushed up after the 3.9 merge window closed.

  There should be a lot more activity in the 3.11 merge window"

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  arch/tile: Fix syscall return value passed to tracepoint
  tile: comment assumption about __insn_mtspr for <asm/irqflags.h>
  tile: ns2cycles should use __raw_get_cpu_var
  arch: remove KCORE_ELF again [tile]
  tile: remove two outdated Kconfig entries
  tile: support atomic64_dec_if_positive()
  tile: support TIF_SYSCALL_TRACEPOINT; select HAVE_SYSCALL_TRACEPOINTS
  tile: Add definition of NR_syscalls
  tile: move declaration of sys_call_table to <asm/syscall.h>
  arch/tile: Enable HAVE_ARCH_TRACEHOOK
  arch/tile: Call tracehook_report_syscall_{entry,exit} in syscall trace

4 files changed, 51 insertions, 28 deletions

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index f212bf7..cb52d66 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -1201,7 +1201,10 @@ handle_syscall:
 	lw	r30, r31
 	andi    r30, r30, _TIF_SYSCALL_TRACE
 	bzt	r30, .Lrestore_syscall_regs
-	jal	do_syscall_trace
+	{
+	 PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+	 jal    do_syscall_trace_enter
+	}
 	FEEDBACK_REENTER(handle_syscall)
 
 	/*
@@ -1252,7 +1255,10 @@ handle_syscall:
 	lw	r30, r31
 	andi    r30, r30, _TIF_SYSCALL_TRACE
 	bzt     r30, 1f
-	jal	do_syscall_trace
+	{
+	 PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+	 jal    do_syscall_trace_exit
+	}
 	FEEDBACK_REENTER(handle_syscall)
 1:	{
 	 movei  r30, 0               /* not an NMI */
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S
index 4ea0809..85d4839 100644
--- a/arch/tile/kernel/intvec_64.S
+++ b/arch/tile/kernel/intvec_64.S
@@ -1000,13 +1000,19 @@ handle_syscall:
 
 	/* Trace syscalls, if requested. */
 	addi	r31, r31, THREAD_INFO_FLAGS_OFFSET
-	ld	r30, r31
-	andi    r30, r30, _TIF_SYSCALL_TRACE
+	{
+	 ld     r30, r31
+	 moveli r32, _TIF_SYSCALL_ENTRY_WORK
+	}
+	and     r30, r30, r32
 	{
 	 addi   r30, r31, THREAD_INFO_STATUS_OFFSET - THREAD_INFO_FLAGS_OFFSET
 	 beqzt	r30, .Lrestore_syscall_regs
 	}
-	jal	do_syscall_trace
+	{
+	 PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+	 jal    do_syscall_trace_enter
+	}
 	FEEDBACK_REENTER(handle_syscall)
 
 	/*
@@ -1071,13 +1077,19 @@ handle_syscall:
 	FEEDBACK_REENTER(handle_syscall)
 
 	/* Do syscall trace again, if requested. */
-	ld	r30, r31
-	andi    r0, r30, _TIF_SYSCALL_TRACE
+	{
+	 ld      r30, r31
+	 moveli  r32, _TIF_SYSCALL_EXIT_WORK
+	}
+	and      r0, r30, r32
 	{
 	 andi    r0, r30, _TIF_SINGLESTEP
 	 beqzt   r0, 1f
 	}
-	jal	do_syscall_trace
+	{
+	 PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+	 jal    do_syscall_trace_exit
+	}
 	FEEDBACK_REENTER(handle_syscall)
 	andi    r0, r30, _TIF_SINGLESTEP
 
diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
index 9835312..0f83ed4 100644
--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -21,9 +21,13 @@
 #include <linux/uaccess.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
+#include <linux/tracehook.h>
 #include <asm/traps.h>
 #include <arch/chip.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
 void user_enable_single_step(struct task_struct *child)
 {
 	set_tsk_thread_flag(child, TIF_SINGLESTEP);
@@ -246,29 +250,26 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 }
 #endif
 
-void do_syscall_trace(void)
+int do_syscall_trace_enter(struct pt_regs *regs)
 {
-	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
+	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
+		if (tracehook_report_syscall_entry(regs))
+			regs->regs[TREG_SYSCALL_NR] = -1;
+	}
 
-	if (!(current->ptrace & PT_PTRACED))
-		return;
+	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+		trace_sys_enter(regs, regs->regs[TREG_SYSCALL_NR]);
 
-	/*
-	 * The 0x80 provides a way for the tracing parent to distinguish
-	 * between a syscall stop and SIGTRAP delivery
-	 */
-	ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+	return regs->regs[TREG_SYSCALL_NR];
+}
 
-	/*
-	 * this isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
-	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
+void do_syscall_trace_exit(struct pt_regs *regs)
+{
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, 0);
+
+	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+		trace_sys_exit(regs, regs->regs[0]);
 }
 
 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
diff --git a/arch/tile/kernel/time.c b/arch/tile/kernel/time.c
index f6f50f2a..5ac397e 100644
--- a/arch/tile/kernel/time.c
+++ b/arch/tile/kernel/time.c
@@ -230,6 +230,10 @@ int setup_profiling_timer(unsigned int multiplier)
  */
 cycles_t ns2cycles(unsigned long nsecs)
 {
-	struct clock_event_device *dev = &__get_cpu_var(tile_timer);
+	/*
+	 * We do not have to disable preemption here as each core has the same
+	 * clock frequency.
+	 */
+	struct clock_event_device *dev = &__raw_get_cpu_var(tile_timer);
 	return ((u64)nsecs * dev->mult) >> dev->shift;
 }