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stop_machine: convert cpu notifier to return encapsulate errno value 

In commit e6bde73b07 ("cpu-hotplug: return
better errno on cpu hotplug failure"), the cpu notifier can return an
encapsulated errno value.

This converts the cpu notifier to return an encapsulated errno value for
stop_machine().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2010-10-26 14:22:45 -07:00 committed by Linus Torvalds
parent ca51c5a763
commit 4ce6494dbd
1 changed files with 2 additions and 2 deletions
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4
kernel/stop_machine.c
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@ -304,7 +304,7 @@ static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
p = kthread_create(cpu_stopper_thread, stopper, "migration/%d",
cpu);
if (IS_ERR(p))
return NOTIFY_BAD;
return notifier_from_errno(PTR_ERR(p));
get_task_struct(p);
kthread_bind(p, cpu);
sched_set_stop_task(cpu, p);
@ -372,7 +372,7 @@ static int __init cpu_stop_init(void)
/* start one for the boot cpu */
err = cpu_stop_cpu_callback(&cpu_stop_cpu_notifier, CPU_UP_PREPARE,
bcpu);
BUG_ON(err == NOTIFY_BAD);
BUG_ON(err != NOTIFY_OK);
cpu_stop_cpu_callback(&cpu_stop_cpu_notifier, CPU_ONLINE, bcpu);
register_cpu_notifier(&cpu_stop_cpu_notifier);