Add a thread flag to activate system-wide syscall tracing. folded omap-arm-fix-syscall-exit-trace-flag.patch. Signed-off-by: Mathieu Desnoyers --- arch/arm/include/asm/thread_info.h | 3 +++ arch/arm/kernel/entry-common.S | 2 ++ 2 files changed, 5 insertions(+) Index: linux-2.6-lttng/arch/arm/include/asm/thread_info.h =================================================================== --- linux-2.6-lttng.orig/arch/arm/include/asm/thread_info.h 2009-03-15 15:58:19.000000000 -0400 +++ linux-2.6-lttng/arch/arm/include/asm/thread_info.h 2009-03-15 15:58:20.000000000 -0400 @@ -124,6 +124,7 @@ extern void iwmmxt_task_switch(struct th /* * thread information flags: * TIF_SYSCALL_TRACE - syscall trace active + * TIF_KERNEL_TRACE - kernel trace active * TIF_SIGPENDING - signal pending * TIF_NEED_RESCHED - rescheduling necessary * TIF_USEDFPU - FPU was used by this task this quantum (SMP) @@ -131,6 +132,7 @@ extern void iwmmxt_task_switch(struct th */ #define TIF_SIGPENDING 0 #define TIF_NEED_RESCHED 1 +#define TIF_KERNEL_TRACE 7 #define TIF_SYSCALL_TRACE 8 #define TIF_POLLING_NRFLAG 16 #define TIF_USING_IWMMXT 17 @@ -139,6 +141,7 @@ extern void iwmmxt_task_switch(struct th #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#define _TIF_KERNEL_TRACE (1 << TIF_KERNEL_TRACE) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) Index: linux-2.6-lttng/arch/arm/kernel/entry-common.S =================================================================== --- linux-2.6-lttng.orig/arch/arm/kernel/entry-common.S 2009-03-15 16:00:03.000000000 -0400 +++ linux-2.6-lttng/arch/arm/kernel/entry-common.S 2009-03-15 16:00:15.000000000 -0400 @@ -43,6 +43,8 @@ ret_fast_syscall: * Ok, we need to do extra processing, enter the slow path. */ fast_work_pending: + tst r1, #_TIF_KERNEL_TRACE @ flag can be set asynchronously + bne __sys_trace_return str r0, [sp, #S_R0+S_OFF]! @ returned r0 work_pending: tst r1, #_TIF_NEED_RESCHED -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/