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s390/ap: Replace xchg() with WRITE_ONCE()

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The result of xchg() is not used, and in addition it is used on a one byte
memory area which leads to inefficient code.

Use WRITE_ONCE() instead to achieve the same result with much less
generated code.

Acked-by: Harald Freudenberger <freude@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-11-25 12:54:30 +01:00
parent ff123eb774
commit 7726b55b5d
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/crypto/ap_bus.c
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@ -453,7 +453,7 @@ static void ap_tasklet_fn(unsigned long dummy)
* important that no requests on any AP get lost.
*/
if (ap_irq_flag)
xchg(ap_airq.lsi_ptr, 0);
WRITE_ONCE(*ap_airq.lsi_ptr, 0);
spin_lock_bh(&ap_queues_lock);
hash_for_each(ap_queues, bkt, aq, hnode) {