| Date | Mon, 24 Mar 2014 19:07:09 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered kprobe on singlestepping |
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(2014/03/22 6:44), Steven Rostedt wrote: > On Wed, 05 Mar 2014 20:58:57 +0900 > Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote: > >> Since the NMI handlers(e.g. perf) can interrupt in the >> single stepping (or preparing the single stepping, do_debug >> etc.), we should consider a kprobe is hit in the NMI >> handler. Even in that case, the kprobe is allowed to be >> reentered as same as the kprobes hit in kprobe handlers >> (KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE). >> The real issue will happen when a kprobe hit while another >> reentered kprobe is processing (KPROBE_REENTER), because >> we already consumed a saved-area for the previous kprobe. >> >> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> >> Cc: Thomas Gleixner <tglx@linutronix.de> >> Cc: Ingo Molnar <mingo@redhat.com> >> Cc: "H. Peter Anvin" <hpa@zytor.com> > > Reviewed-by: Steven Rostedt <rostedt@goodmis.org> >
Thanks! :)
-- Masami HIRAMATSU IT Management Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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