[2/5] mm/backing-dev: Use irqsave variant of atomic_dec_and_lock()
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Message ID 20180504154533.8833-3-bigeasy@linutronix.de
State New
Headers show

Commit Message

Sebastian Andrzej Siewior May 4, 2018, 3:45 p.m. UTC
From: Anna-Maria Gleixner <anna-maria@linutronix.de>

The irqsave variant of atomic_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.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/backing-dev.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

Patch
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diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 023190c69dce..c28418914591 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -484,11 +484,8 @@  void wb_congested_put(struct bdi_writeback_congested *congested)
 {
 	unsigned long flags;
 
-	local_irq_save(flags);
-	if (!atomic_dec_and_lock(&congested->refcnt, &cgwb_lock)) {
-		local_irq_restore(flags);
+	if (!atomic_dec_and_lock_irqsave(&congested->refcnt, &cgwb_lock, flags))
 		return;
-	}
 
 	/* bdi might already have been destroyed leaving @congested unlinked */
 	if (congested->__bdi) {