From 07c4a776135ea6d808ea19aabeb51de6b8648402 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 26 Jan 2016 12:15:37 +0100 Subject: perf: Update locking order Update the locking order to note that ctx::lock nests inside of child_mutex, as per: perf_ioctl(): ctx::mutex -> perf_event_for_each(): event::child_mutex -> _perf_event_enable(): ctx::lock Signed-off-by: Peter Zijlstra (Intel) Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Jiri Olsa Cc: Linus Torvalds Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Signed-off-by: Ingo Molnar --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 024adf0e34eb..d345964c2bd6 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1086,8 +1086,8 @@ static void put_ctx(struct perf_event_context *ctx) * Lock order: * task_struct::perf_event_mutex * perf_event_context::mutex - * perf_event_context::lock * perf_event::child_mutex; + * perf_event_context::lock * perf_event::mmap_mutex * mmap_sem */ -- cgit v1.2.3