kprobes/x86: Disable preemption in optprobe
Disable preemption in optprobe handler as described in Documentation/kprobes.txt, which says: "Probe handlers are run with preemption disabled." Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/150581525942.32348.6359217983269060829.stgit@devbox Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -161,6 +161,7 @@ optimized_callback(struct optimized_kprobe *op, struct pt_regs *regs)
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return;
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local_irq_save(flags);
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preempt_disable();
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if (kprobe_running()) {
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kprobes_inc_nmissed_count(&op->kp);
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} else {
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@ -180,6 +181,7 @@ optimized_callback(struct optimized_kprobe *op, struct pt_regs *regs)
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opt_pre_handler(&op->kp, regs);
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__this_cpu_write(current_kprobe, NULL);
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}
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preempt_enable_no_resched();
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local_irq_restore(flags);
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}
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NOKPROBE_SYMBOL(optimized_callback);
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