Re: [PATCH -tip ] [BUGFIX]tracing/kprobes: Fix kprobe-tracer tosupport stack trace

[Mike Frysinger]

On Wed, May 25, 2011 at 22:07, Steven Rostedt wrote:
> On Thu, 2011-05-12 at 19:22 +0900, Masami Hiramatsu wrote:
>> Fix to support kernel stack trace correctly on kprobe-tracer.
>> Since the execution path of kprobe-based dynamic events is different
>> from other tracepoint-based events, normal ftrace_trace_stack() doesn't
>> work correctly. To fix that, this introduces ftrace_trace_stack_regs()
>> which traces stack via pt_regs instead of current stack register.
>
> I'm working to get a "fix" patch set push out, and I included this
> patch. But when I ran it on my arch test (compiling on other archs),
> this patch broke the following:
>
> Âarm, blackfin, powerpc, s390.
>
> (Note, due to other bugs, UML and mips does not build to test)
>
> The problem is that these archs do not implement a:
>
> Âsave_stack_trace_regs() function.

i think only x86 implements that func ?  and its stacktrace.c just
seems to beg for generalization ...
-mike
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