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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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