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sched/membarrier: Modernize membarrier_global_expedited with cleanup guards

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Replace explicit lock/unlock and free calls with scoped guards and
automatic cleanup constructs.

Signed-off-by: Aniket Gattani <aniketgattani@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260503212205.3714217-3-aniketgattani@google.com
This commit is contained in:
Aniket Gattani 2026-05-03 21:22:04 +00:00 committed by Peter Zijlstra
parent 89976cd737
commit a595972854
1 changed files with 4 additions and 17 deletions
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21
kernel/sched/membarrier.c
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@ -267,23 +267,19 @@ void membarrier_update_current_mm(struct mm_struct *next_mm)
static int membarrier_global_expedited(void)
{
cpumask_var_t __free(free_cpumask_var) tmpmask = CPUMASK_VAR_NULL;
int cpu;
cpumask_var_t tmpmask;
if (num_online_cpus() == 1)
return 0;
/*
* Matches memory barriers after rq->curr modification in
* scheduler.
*/
smp_mb(); /* system call entry is not a mb. */
if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
return -ENOMEM;
guard(mb)();
SERIALIZE_IPI();
cpus_read_lock();
guard(cpus_read_lock)();
rcu_read_lock();
for_each_online_cpu(cpu) {
struct task_struct *p;
@ -319,15 +315,6 @@ static int membarrier_global_expedited(void)
smp_call_function_many(tmpmask, ipi_mb, NULL, 1);
preempt_enable();
free_cpumask_var(tmpmask);
cpus_read_unlock();
/*
* Memory barrier on the caller thread _after_ we finished
* waiting for the last IPI. Matches memory barriers before
* rq->curr modification in scheduler.
*/
smp_mb(); /* exit from system call is not a mb */
return 0;
}