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Date: Sat, 17 Oct 2009 09:57:03 GMT From: tip-bot for Masami Hiramatsu <mhiramat@...hat.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, ananth@...ibm.com, hpa@...or.com, mingo@...hat.com, fweisbec@...il.com, tglx@...utronix.de, mhiramat@...hat.com, mingo@...e.hu Subject: [tip:perf/probes] kprobes/x86-64: Allow to reenter probe on post_handler Commit-ID: f5ad31158d60946b9fd18c8a79c283a6bc432430 Gitweb: http://git.kernel.org/tip/f5ad31158d60946b9fd18c8a79c283a6bc432430 Author: Masami Hiramatsu <mhiramat@...hat.com> AuthorDate: Thu, 27 Aug 2009 13:23:04 -0400 Committer: Frederic Weisbecker <fweisbec@...il.com> CommitDate: Sun, 30 Aug 2009 03:08:26 +0200 kprobes/x86-64: Allow to reenter probe on post_handler Allow to reenter probe on the post_handler of another probe on x86-64, because x86-64 already allows reentering int3. In that case, reentered probe just increases kp.nmissed and returns. Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com> Cc: Ingo Molnar <mingo@...e.hu> LKML-Reference: <20090827172304.8246.4822.stgit@...alhost.localdomain> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> --- arch/x86/kernel/kprobes.c | 11 ----------- 1 files changed, 0 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c index e0fb615..c5f1f11 100644 --- a/arch/x86/kernel/kprobes.c +++ b/arch/x86/kernel/kprobes.c @@ -463,17 +463,6 @@ static int __kprobes reenter_kprobe(struct kprobe *p, struct pt_regs *regs, { switch (kcb->kprobe_status) { case KPROBE_HIT_SSDONE: -#ifdef CONFIG_X86_64 - /* TODO: Provide re-entrancy from post_kprobes_handler() and - * avoid exception stack corruption while single-stepping on - * the instruction of the new probe. - */ - arch_disarm_kprobe(p); - regs->ip = (unsigned long)p->addr; - reset_current_kprobe(); - preempt_enable_no_resched(); - break; -#endif case KPROBE_HIT_ACTIVE: save_previous_kprobe(kcb); set_current_kprobe(p, regs, kcb); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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