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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>
This commit is contained in:
Oleg Nesterov 2015-11-15 20:33:20 +01:00 committed by Ingo Molnar
parent 1b034bd989
commit 958c5f848e
1 changed files with 4 additions and 2 deletions
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6
kernel/stop_machine.c
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@ -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. */