[v2, 1/4] powerpc/kprobes: Pause function_graph tracing during jprobes handling

[Michael Ellerman]

On Thu, 2017-06-01 at 10:48:15 UTC, "Naveen N. Rao" wrote:
> This fixes a crash when function_graph and jprobes are used together.
> This is essentially commit 237d28db036e ("ftrace/jprobes/x86: Fix
> conflict between jprobes and function graph tracing"), but for powerpc.
> 
> Jprobes breaks function_graph tracing since the jprobe hook needs to use
> jprobe_return(), which never returns back to the hook, but instead to
> the original jprobe'd function. The solution is to momentarily pause
> function_graph tracing before invoking the jprobe hook and re-enable it
> when returning back to the original jprobe'd function.
> 
> Fixes: 6794c78243bfd ("powerpc64: port of the function graph tracer")
> Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
> Acked-by: Masami Hiramatsu <mhiramat at kernel.org>
> Acked-by: Steven Rostedt (VMware) <rostedt at goodmis.org>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a9f8553e935f26cb5447f67e280946

cheers