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bdi: use irqsave variant of refcount_dec_and_lock() 

The irqsave variant of refcount_dec_and_lock handles irqsave/restore when
taking/releasing the spin lock.  With this variant the call of
local_irq_save/restore is no longer required.

[bigeasy@linutronix.de: s@atomic_dec_and_lock@refcount_dec_and_lock@g]
Link: http://lkml.kernel.org/r/20180703200141.28415-5-bigeasy@linutronix.de
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anna-Maria Gleixner 2018-08-21 21:55:35 -07:00 committed by Linus Torvalds
parent e58dd0de5e
commit 060288a732
1 changed files with 1 additions and 4 deletions
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5
mm/backing-dev.c
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@ -473,11 +473,8 @@ void wb_congested_put(struct bdi_writeback_congested *congested)
{
unsigned long flags;
local_irq_save(flags);
if (!refcount_dec_and_lock(&congested->refcnt, &cgwb_lock)) {
local_irq_restore(flags);
if (!refcount_dec_and_lock_irqsave(&congested->refcnt, &cgwb_lock, &flags))
return;
}
/* bdi might already have been destroyed leaving @congested unlinked */
if (congested->__bdi) {