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    Subject[tip:perf/core] stack_trace: Add weak save_stack_trace_regs()
    Commit-ID:  c624d33f61cd05241e85b906311f0b712fdb0f32
    Gitweb: http://git.kernel.org/tip/c624d33f61cd05241e85b906311f0b712fdb0f32
    Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    AuthorDate: Wed, 8 Jun 2011 16:09:27 +0900
    Committer: Steven Rostedt <rostedt@goodmis.org>
    CommitDate: Tue, 14 Jun 2011 22:48:52 -0400

    stack_trace: Add weak save_stack_trace_regs()

    Add weak symbol of save_stack_trace_regs() as same as
    save_stack_trace_tsk() since that is not implemented
    except x86 yet.

    Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: yrl.pp-manager.tt@hitachi.com
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Namhyung Kim <namhyung@gmail.com>
    Link: http://lkml.kernel.org/r/20110608070927.17777.37895.stgit@fedora15
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    kernel/stacktrace.c | 12 +++++++++---
    1 files changed, 9 insertions(+), 3 deletions(-)

    diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
    index eb212f8..d20c698 100644
    --- a/kernel/stacktrace.c
    +++ b/kernel/stacktrace.c
    @@ -26,12 +26,18 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
    EXPORT_SYMBOL_GPL(print_stack_trace);

    /*
    - * Architectures that do not implement save_stack_trace_tsk get this
    - * weak alias and a once-per-bootup warning (whenever this facility
    - * is utilized - for example by procfs):
    + * Architectures that do not implement save_stack_trace_tsk or
    + * save_stack_trace_regs get this weak alias and a once-per-bootup warning
    + * (whenever this facility is utilized - for example by procfs):
    */
    __weak void
    save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
    {
    WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
    }
    +
    +__weak void
    +save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
    +{
    + WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
    +}

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