diff options
| author |   Peter Zijlstra <peterz@infradead.org> | 2017-05-19 12:58:25 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-05-23 10:01:32 +0200 |
| commit | 6c8557bdb28df3ae97476c5e2aed6373cd235aab (patch) | |
| tree | 2b134869f2f58494ac3ae664cf6403cb4ff2cbff /kernel/smp.c | |
| parent | smp: Avoid sending needless IPI in smp_call_function_many() (diff) | |
| download | linux-dev-6c8557bdb28df3ae97476c5e2aed6373cd235aab.tar.xz linux-dev-6c8557bdb28df3ae97476c5e2aed6373cd235aab.zip | |
smp, cpumask: Use non-atomic cpumask_{set,clear}_cpu()
The cpumasks in smp_call_function_many() are private and not subject
to concurrency, atomic bitops are pointless and expensive.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/smp.c')
| -rw-r--r-- | kernel/smp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index 76d16fe3c427..3061483cb3ad 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -436,7 +436,7 @@ void smp_call_function_many(const struct cpumask *mask, cfd = this_cpu_ptr(&cfd_data); cpumask_and(cfd->cpumask, mask, cpu_online_mask); - cpumask_clear_cpu(this_cpu, cfd->cpumask); + __cpumask_clear_cpu(this_cpu, cfd->cpumask); /* Some callers race with other cpus changing the passed mask */ if (unlikely(!cpumask_weight(cfd->cpumask))) @@ -452,7 +452,7 @@ void smp_call_function_many(const struct cpumask *mask, csd->func = func; csd->info = info; if (llist_add(&csd->llist, &per_cpu(call_single_queue, cpu))) - cpumask_set_cpu(cpu, cfd->cpumask_ipi); + __cpumask_set_cpu(cpu, cfd->cpumask_ipi); } /* Send a message to all CPUs in the map */ |