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smp: Remove preempt_disable() from smp_call_function()

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smp_call_function_many_cond() handles the preemption and CPU pinning
requirements internally. smp_call_function() only forwards the request to
that helper for cpu_online_mask and does not access CPU-local state on
its own.

Remove the outer preempt_disable() and preempt_enable() pair from
smp_call_function().

Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20260709122933.4021501-8-zhouchuyi@bytedance.com
This commit is contained in:
Chuyi Zhou
2026-07-16 09:24:55 +02:00
committed by Thomas Gleixner
parent 8df8a60283
commit 66344732b0
1 changed files with 6 additions and 7 deletions
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kernel/smp.c
+6 -7
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@@ -1007,10 +1007,10 @@ EXPORT_SYMBOL(smp_call_function_many);
/**
* smp_call_function() - Run a function on all other CPUs.
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
* @wait: If true, wait (atomically) until function has completed
* on other CPUs.
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
* @wait: If true, wait (atomically) until function has completed
* on other CPUs.
*
* If @wait is true, then returns once @func has returned; otherwise
* it returns just before the target cpu calls @func.
@@ -1020,9 +1020,8 @@ EXPORT_SYMBOL(smp_call_function_many);
*/
void smp_call_function(smp_call_func_t func, void *info, int wait)
{
preempt_disable();
smp_call_function_many(cpu_online_mask, func, info, wait);
preempt_enable();
smp_call_function_many_cond(cpu_online_mask, func, info,
wait ? SCF_WAIT : 0, NULL);
}
EXPORT_SYMBOL(smp_call_function);