lkml.org 
[lkml]   [2009]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 05/17] arm: TIF_NOTIFY_RESUME
    Date
    This makes arm support TIF_NOTIFY_RESUME, so that set_notify_resume()
    requests a call to tracehook_notify_resume() on the way back to user mode.

    Signed-off-by: Roland McGrath <roland@redhat.com>
    ---
    arch/arm/include/asm/thread_info.h | 4 ++++
    arch/arm/kernel/entry-common.S | 2 +-
    arch/arm/kernel/signal.c | 5 +++++
    3 files changed, 10 insertions(+), 1 deletions(-)

    diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
    index 4f88482..def86a0 100644
    --- a/arch/arm/include/asm/thread_info.h
    +++ b/arch/arm/include/asm/thread_info.h
    @@ -129,12 +129,14 @@ extern void vfp_sync_state(struct thread_info *thread);
    * thread information flags:
    * TIF_SYSCALL_TRACE - syscall trace active
    * TIF_SIGPENDING - signal pending
    + * TIF_NOTIFY_RESUME - tracing notification pending
    * TIF_NEED_RESCHED - rescheduling necessary
    * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
    * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
    */
    #define TIF_SIGPENDING 0
    #define TIF_NEED_RESCHED 1
    +#define TIF_NOTIFY_RESUME 2
    #define TIF_SYSCALL_TRACE 8
    #define TIF_POLLING_NRFLAG 16
    #define TIF_USING_IWMMXT 17
    @@ -142,6 +144,7 @@ extern void vfp_sync_state(struct thread_info *thread);
    #define TIF_FREEZE 19

    #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
    +#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
    #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
    #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
    #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
    @@ -152,6 +155,7 @@ extern void vfp_sync_state(struct thread_info *thread);
    * Change these and you break ASM code in entry-common.S
    */
    #define _TIF_WORK_MASK 0x000000ff
    +#define _TIF_DO_NOTIFY_RESUME (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME)

    #endif /* __KERNEL__ */
    #endif /* __ASM_ARM_THREAD_INFO_H */
    diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
    index b55cb03..2523cac 100644
    --- a/arch/arm/kernel/entry-common.S
    +++ b/arch/arm/kernel/entry-common.S
    @@ -51,7 +51,7 @@ fast_work_pending:
    work_pending:
    tst r1, #_TIF_NEED_RESCHED
    bne work_resched
    - tst r1, #_TIF_SIGPENDING
    + tst r1, #_TIF_DO_NOTIFY_RESUME
    beq no_work_pending
    mov r0, sp @ 'regs'
    mov r2, why @ 'syscall'
    diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
    index 51e2187..6663ee0 100644
    --- a/arch/arm/kernel/signal.c
    +++ b/arch/arm/kernel/signal.c
    @@ -705,4 +705,9 @@ do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
    {
    if (thread_flags & _TIF_SIGPENDING)
    do_signal(&current->blocked, regs, syscall);
    +
    + if (thread_flags & _TIF_NOTIFY_RESUME) {
    + clear_thread_flag(TIF_NOTIFY_RESUME);
    + tracehook_notify_resume(regs);
    + }
    }

    \
     
     \ /
      Last update: 2009-04-25 02:15    [W:0.024 / U:94.180 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site