summaryrefslogtreecommitdiff
path: root/include/linux/refcount.h
diff options
context:
space:
mode:
authorAnna-Maria Gleixner <anna-maria@linutronix.de>2018-06-12 19:16:21 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-06-13 00:33:25 +0300
commit7ea959c45769612aa92557fb6464679f5fec7d9e (patch)
tree59727b6ac6c32a2addb41cab2c875ab7caee1b75 /include/linux/refcount.h
parentccfbb5bed407053b27492a9adc06064d949a9aa6 (diff)
downloadlinux-7ea959c45769612aa92557fb6464679f5fec7d9e.tar.xz
locking/refcounts: Implement refcount_dec_and_lock_irqsave()
There are in-tree users of refcount_dec_and_lock() which must acquire the spin lock with interrupts disabled. To workaround the lack of an irqsave variant of refcount_dec_and_lock() they use local_irq_save() at the call site. This causes extra code and creates in some places unneeded long interrupt disabled times. These places need also extra treatment for PREEMPT_RT due to the disconnect of the irq disabling and the lock function. Implement the missing irqsave variant of the function. Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r20180612161621.22645-4-bigeasy@linutronix.de [bigeasy: s@atomic_dec_and_lock@refcount_dec_and_lock@g]
Diffstat (limited to 'include/linux/refcount.h')
-rw-r--r--include/linux/refcount.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/refcount.h b/include/linux/refcount.h
index 4193c41e383a..a685da2c4522 100644
--- a/include/linux/refcount.h
+++ b/include/linux/refcount.h
@@ -98,5 +98,7 @@ extern __must_check bool refcount_dec_if_one(refcount_t *r);
extern __must_check bool refcount_dec_not_one(refcount_t *r);
extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock);
extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock);
-
+extern __must_check bool refcount_dec_and_lock_irqsave(refcount_t *r,
+ spinlock_t *lock,
+ unsigned long *flags);
#endif /* _LINUX_REFCOUNT_H */