From 499d79559ffe4b9c0c3031752f6a40abd532fb75 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 28 Sep 2015 18:52:36 +0200 Subject: [PATCH] sched/core: More notrace annotations preempt_schedule_common() is marked notrace, but it does not use _notrace() preempt_count functions and __schedule() is also not marked notrace, which means that its perfectly possible to end up in the tracer from preempt_schedule_common(). Steve says: | Yep, there's some history to this. This was originally the issue that | caused function tracing to go into infinite recursion. But now we have | preempt_schedule_notrace(), which is used by the function tracer, and | that function must not be traced till preemption is disabled. | | Now if function tracing is running and we take an interrupt when | NEED_RESCHED is set, it calls | | preempt_schedule_common() (not traced) | | But then that calls preempt_disable() (traced) | | function tracer calls preempt_disable_notrace() followed by | preempt_enable_notrace() which will see NEED_RESCHED set, and it will | call preempt_schedule_notrace(), which stops the recursion, but | still calls __schedule() here, and that means when we return, we call | the __schedule() from preempt_schedule_common(). | | That said, I prefer this patch. Preemption is disabled before calling | __schedule(), and we get rid of a one round recursion with the | scheduler. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Thomas Gleixner Acked-by: Steven Rostedt Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index ca260cc..98c4cf8 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3057,7 +3057,7 @@ again: * * WARNING: must be called with preemption disabled! */ -static void __sched __schedule(bool preempt) +static void __sched notrace __schedule(bool preempt) { struct task_struct *prev, *next; unsigned long *switch_count; @@ -3203,9 +3203,9 @@ void __sched schedule_preempt_disabled(void) static void __sched notrace preempt_schedule_common(void) { do { - preempt_disable(); + preempt_disable_notrace(); __schedule(true); - sched_preempt_enable_no_resched(); + preempt_enable_no_resched_notrace(); /* * Check again in case we missed a preemption opportunity -- 2.7.4