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authorOleg Nesterov <oleg@redhat.com>2015-10-08 19:01:41 +0200
committerIngo Molnar <mingo@kernel.org>2015-10-20 10:23:55 +0200
commitd8bc853582bfd81a9c08ca6922aeb01570080ccc (patch)
tree20b0dd94f84060559063c561cd0599a565e1a39b /include
parent5caa1c089aebcb83ccd5b79a3b88b0aa58288d05 (diff)
stop_machine: Change cpu_stop_queue_two_works() to rely on stopper->enabled
Change cpu_stop_queue_two_works() to ensure that both CPU's have stopper->enabled == T or fail otherwise. This way stop_two_cpus() no longer needs to check cpu_active() to avoid the deadlock. This patch doesn't remove these checks, we will do this later. Note: we need to take both stopper->lock's at the same time, but this will also help to remove lglock from stop_machine.c, so I hope this is fine. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: heiko.carstens@de.ibm.com Link: http://lkml.kernel.org/r/20151008170141.GA25537@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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