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    Subject[PATCH 3.10 37/65] powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Anton Blanchard <anton@samba.org>

    commit 9a5cbce421a283e6aea3c4007f141735bf9da8c3 upstream.

    We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
    (currently 127), but we forgot to do the same for 64bit backtraces.

    Signed-off-by: Anton Blanchard <anton@samba.org>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/perf/callchain.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/powerpc/perf/callchain.c
    +++ b/arch/powerpc/perf/callchain.c
    @@ -243,7 +243,7 @@ static void perf_callchain_user_64(struc
    sp = regs->gpr[1];
    perf_callchain_store(entry, next_ip);

    - for (;;) {
    + while (entry->nr < PERF_MAX_STACK_DEPTH) {
    fp = (unsigned long __user *) sp;
    if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp))
    return;



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