From 9074571ec0afa51c73bfd9910906961b48c17f31 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Thu, 21 Sep 2017 14:39:56 +0200 Subject: [PATCH 344/352] rt/locking: allow recursive local_trylock() required for following networking patch which does recursive try-lock. While at it, add the !RT version of it because it did not yet exist. Cc: stable-rt@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior --- include/linux/locallock.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/locallock.h b/include/linux/locallock.h index 845c77f..280f884 100644 --- a/include/linux/locallock.h +++ b/include/linux/locallock.h @@ -77,6 +77,9 @@ static inline int __local_trylock(struct local_irq_lock *lv) lv->owner = current; lv->nestcnt = 1; return 1; + } else if (lv->owner == current) { + lv->nestcnt++; + return 1; } return 0; } @@ -250,6 +253,12 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, static inline void local_irq_lock_init(int lvar) { } +#define local_trylock(lvar) \ + ({ \ + preempt_disable(); \ + 1; \ + }) + #define local_lock(lvar) preempt_disable() #define local_unlock(lvar) preempt_enable() #define local_lock_irq(lvar) local_irq_disable() -- 2.7.4