]> git.karo-electronics.de Git - linux-beck.git/commit
context_tracking: Restore previous state in schedule_user
authorAndy Lutomirski <luto@amacapital.net>
Wed, 3 Dec 2014 23:37:08 +0000 (15:37 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 4 Dec 2014 04:55:58 +0000 (20:55 -0800)
commit7cc78f8fa02c2485104b86434acbc1538a3bd807
treef3a9fdccb6f2c4db996299fe23f6597592b30085
parentebcd241a635c868b1f89abbfb4dd176ca5f81eba
context_tracking: Restore previous state in schedule_user

It appears that some SCHEDULE_USER (asm for schedule_user) callers
in arch/x86/kernel/entry_64.S are called from RCU kernel context,
and schedule_user will return in RCU user context.  This causes RCU
warnings and possible failures.

This is intended to be a minimal fix suitable for 3.18.

Reported-and-tested-by: Dave Jones <davej@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/sched/core.c