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authorOleg Nesterov <oleg@redhat.com>2015-11-15 20:33:20 +0100
committerIngo Molnar <mingo@kernel.org>2015-11-23 09:48:18 +0100
commit958c5f848e17e216df138cc2161b07b7120e2d15 (patch)
tree7a91e770f30b3cec6baf90b4422e09526e438943 /kernel/stop_machine.c
parent1b034bd989aa4a396c13d305759c376c52595a97 (diff)
downloadop-kernel-dev-958c5f848e17e216df138cc2161b07b7120e2d15.zip
op-kernel-dev-958c5f848e17e216df138cc2161b07b7120e2d15.tar.gz
stop_machine: Change stop_one_cpu() to rely on cpu_stop_queue_work()
Change stop_one_cpu() to return -ENOENT if cpu_stop_queue_work() fails. Otherwise we know that ->executed must be true after wait_for_completion() so we can just return done.ret. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Tejun Heo <tj@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Milos Vyletel <milos@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20151115193320.GA8259@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/stop_machine.c')
-rw-r--r--kernel/stop_machine.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 0ec1f16..68b73c4 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -128,9 +128,11 @@ int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg)
struct cpu_stop_work work = { .fn = fn, .arg = arg, .done = &done };
cpu_stop_init_done(&done, 1);
- cpu_stop_queue_work(cpu, &work);
+ if (!cpu_stop_queue_work(cpu, &work))
+ return -ENOENT;
wait_for_completion(&done.completion);
- return done.executed ? done.ret : -ENOENT;
+ WARN_ON(!done.executed);
+ return done.ret;
}
/* This controls the threads on each CPU. */
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