From: Thomas Gleixner Date: Fri, 8 Jul 2011 16:35:35 +0200 Subject: [PATCH 176/351] fs/epoll: Do not disable preemption on RT Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=de20909c36add2592e1fd5ec37b2c116b1054e20 ep_call_nested() takes a sleeping lock so we can't disable preemption. The light version is enough since ep_call_nested() doesn't mind beeing invoked twice on the same CPU. Signed-off-by: Thomas Gleixner --- fs/eventpoll.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index a4a32b79e832..8569db5eceb0 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -569,12 +569,12 @@ static int ep_poll_wakeup_proc(void *priv, void *cookie, int call_nests) static void ep_poll_safewake(wait_queue_head_t *wq) { - int this_cpu = get_cpu(); + int this_cpu = get_cpu_light(); ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS, ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu); - put_cpu(); + put_cpu_light(); } #else