From 49faecbc581de038b423d7abbebe0d7b50ed15ef Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 8 Apr 2013 16:08:46 +0200 Subject: [PATCH] percpu-rwsem: compile fix Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patches-3.10.4-rt1.tar.xz The shortcut on mainline skip lockdep. No idea why this is a good thing. Signed-off-by: Sebastian Andrzej Siewior --- lib/percpu-rwsem.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-stable/lib/percpu-rwsem.c =================================================================== --- linux-stable.orig/lib/percpu-rwsem.c +++ linux-stable/lib/percpu-rwsem.c @@ -84,8 +84,12 @@ void percpu_down_read(struct percpu_rw_s down_read(&brw->rw_sem); atomic_inc(&brw->slow_read_ctr); +#ifdef CONFIG_PREEMPT_RT_FULL + up_read(&brw->rw_sem); +#else /* avoid up_read()->rwsem_release() */ __up_read(&brw->rw_sem); +#endif } void percpu_up_read(struct percpu_rw_semaphore *brw)