diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2010-02-24 09:54:54 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2011-09-13 11:11:59 +0200 |
| commit | ddb6c9b58a19edcfac93ac670b066c836ff729f1 (patch) | |
| tree | 70a9ab2dde08671a050424b0d70fa535472e1345 /include/linux/rwsem.h | |
| parent | locking, semaphores: Annotate inner lock as raw (diff) | |
| download | wireguard-linux-ddb6c9b58a19edcfac93ac670b066c836ff729f1.tar.xz wireguard-linux-ddb6c9b58a19edcfac93ac670b066c836ff729f1.zip | |
locking, rwsem: Annotate inner lock as raw
There is no reason to allow the lock protecting rwsems (the
ownerless variant) to be preemptible on -rt. Convert it to raw.
In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/rwsem.h')
| -rw-r--r-- | include/linux/rwsem.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h index 6a6741440cb7..63d406554391 100644 --- a/include/linux/rwsem.h +++ b/include/linux/rwsem.h @@ -25,7 +25,7 @@ struct rw_semaphore; /* All arch specific implementations share the same struct */ struct rw_semaphore { long count; - spinlock_t wait_lock; + raw_spinlock_t wait_lock; struct list_head wait_list; #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; @@ -56,9 +56,11 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem) # define __RWSEM_DEP_MAP_INIT(lockname) #endif -#define __RWSEM_INITIALIZER(name) \ - { RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED(name.wait_lock), \ - LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) } +#define __RWSEM_INITIALIZER(name) \ + { RWSEM_UNLOCKED_VALUE, \ + __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \ + LIST_HEAD_INIT((name).wait_list) \ + __RWSEM_DEP_MAP_INIT(name) } #define DECLARE_RWSEM(name) \ struct rw_semaphore name = __RWSEM_INITIALIZER(name) |