diff options
| -rw-r--r-- | kernel/smp.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index f5a4d63f3231..31cdb06a734a 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -712,11 +712,16 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info, err = generic_exec_single(cpu, csd); + /* + * @csd is stack-allocated when @wait is true. No concurrent access + * except from the IPI completion path, so we can re-enable preemption + * early to reduce latency. + */ + put_cpu(); + if (wait) csd_lock_wait(csd); - put_cpu(); - return err; } EXPORT_SYMBOL(smp_call_function_single); |