The following commit has been merged into the locking/core branch of tip: Commit-ID: 6bc8996add9f82d0153b0be44efe282bd45dc702 Gitweb: https://git.kernel.org/tip/6bc8996add9f82d0153b0be44efe282bd45dc702 Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Sun, 15 Aug 2021 23:28:02 +02:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitterDate: Tue, 17 Aug 2021 17:04:35 +02:00 locking/rtmutex: Provide rt_mutex_base_is_locked() Provide rt_mutex_base_is_locked(), which will be used for various wrapped locking primitives for RT. Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210815211302.899572818@xxxxxxxxxxxxx --- include/linux/rtmutex.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h index 8527402..174419e 100644 --- a/include/linux/rtmutex.h +++ b/include/linux/rtmutex.h @@ -13,6 +13,7 @@ #ifndef __LINUX_RT_MUTEX_H #define __LINUX_RT_MUTEX_H +#include <linux/compiler.h> #include <linux/linkage.h> #include <linux/rbtree.h> #include <linux/spinlock_types.h> @@ -32,6 +33,17 @@ struct rt_mutex_base { .owner = NULL \ } +/** + * rt_mutex_base_is_locked - is the rtmutex locked + * @lock: the mutex to be queried + * + * Returns true if the mutex is locked, false if unlocked. + */ +static inline bool rt_mutex_base_is_locked(struct rt_mutex_base *lock) +{ + return READ_ONCE(lock->owner) != NULL; +} + extern void rt_mutex_base_init(struct rt_mutex_base *rtb); /**
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