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    Subject[GIT PULL] perf fix
    Linus,

    Please pull the latest perf-fixes-for-linus git tree from:

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git perf-fixes-for-linus

    Thanks,

    Ingo

    ------------------>
    Frederic Weisbecker (1):
    perf: Fix unsafe frame rewinding with hot regs fetching


    arch/x86/kernel/dumpstack.h | 8 ++++++--
    1 files changed, 6 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/dumpstack.h b/arch/x86/kernel/dumpstack.h
    index e39e771..e1a93be 100644
    --- a/arch/x86/kernel/dumpstack.h
    +++ b/arch/x86/kernel/dumpstack.h
    @@ -14,6 +14,8 @@
    #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
    #endif

    +#include <linux/uaccess.h>
    +
    extern void
    show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
    unsigned long *stack, unsigned long bp, char *log_lvl);
    @@ -42,8 +44,10 @@ static inline unsigned long rewind_frame_pointer(int n)
    get_bp(frame);

    #ifdef CONFIG_FRAME_POINTER
    - while (n--)
    - frame = frame->next_frame;
    + while (n--) {
    + if (probe_kernel_address(&frame->next_frame, frame))
    + break;
    + }
    #endif

    return (unsigned long)frame;

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