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| author | Peter Zijlstra <peterz@infradead.org> | 2021-09-21 22:16:02 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-10-07 13:51:15 +0200 |
| commit | 8850cb663b5cda04d33f9cfbc38889d73d3c8e24 (patch) | |
| tree | b928705d29ba099d985c9d2090a66ca1d28ed052 /kernel/smp.c | |
| parent | sched,livepatch: Use task_call_func() (diff) | |
| download | linux-8850cb663b5cda04d33f9cfbc38889d73d3c8e24.tar.xz linux-8850cb663b5cda04d33f9cfbc38889d73d3c8e24.zip | |
sched: Simplify wake_up_*idle*()
Simplify and make wake_up_if_idle() more robust, also don't iterate
the whole machine with preempt_disable() in it's caller:
wake_up_all_idle_cpus().
This prepares for another wake_up_if_idle() user that needs a full
do_idle() cycle.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Tested-by: Vasily Gorbik <gor@linux.ibm.com> # on s390
Link: https://lkml.kernel.org/r/20210929152428.769328779@infradead.org
Diffstat (limited to 'kernel/smp.c')
| -rw-r--r-- | kernel/smp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index f43ede0ab183..ad0b68a3a3d3 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -1170,14 +1170,14 @@ void wake_up_all_idle_cpus(void) { int cpu; - preempt_disable(); + cpus_read_lock(); for_each_online_cpu(cpu) { - if (cpu == smp_processor_id()) + if (cpu == raw_smp_processor_id()) continue; wake_up_if_idle(cpu); } - preempt_enable(); + cpus_read_unlock(); } EXPORT_SYMBOL_GPL(wake_up_all_idle_cpus); |