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Subject[RFC patch 02/20] LTTng Kernel Trace Thread Flag ARM
Add a thread flag to activate system-wide syscall tracing.

folded omap-arm-fix-syscall-exit-trace-flag.patch.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
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


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