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| author |   Peter Zijlstra <peterz@infradead.org> | 2015-06-22 14:16:31 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-09-22 15:25:52 +0200 |
| commit | 11d9684ca638aad99f740ef3abcba2aa4c9290bf (patch) | |
| tree | 02b0bcbda382d8f6f6b6d50247ff8cdb628bd0d3 /include/linux/percpu-rwsem.h | |
| parent | locking/pv-qspinlock: Use cmpxchg_release() in __pv_queued_spin_unlock() (diff) | |
| download | wireguard-linux-11d9684ca638aad99f740ef3abcba2aa4c9290bf.tar.xz wireguard-linux-11d9684ca638aad99f740ef3abcba2aa4c9290bf.zip | |
locking/percpu-rwsem: Add DEFINE_STATIC_PERCPU_RWSEMand percpu_rwsem_assert_held()
Provide a static init and a standard locking assertion method.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: oleg@redhat.com
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: tj@kernel.org
Cc: viro@ZenIV.linux.org.uk
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/percpu-rwsem.h')
| -rw-r--r-- | include/linux/percpu-rwsem.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index 146efefde2a1..d402d3924a91 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -16,6 +16,15 @@ struct percpu_rw_semaphore { int readers_block; }; +#define DEFINE_STATIC_PERCPU_RWSEM(name) \ +static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_rc_##name); \ +static struct percpu_rw_semaphore name = { \ + .rss = __RCU_SYNC_INITIALIZER(name.rss, RCU_SCHED_SYNC), \ + .read_count = &__percpu_rwsem_rc_##name, \ + .rw_sem = __RWSEM_INITIALIZER(name.rw_sem), \ + .writer = __WAIT_QUEUE_HEAD_INITIALIZER(name.writer), \ +} + extern int __percpu_down_read(struct percpu_rw_semaphore *, int); extern void __percpu_up_read(struct percpu_rw_semaphore *); @@ -102,6 +111,9 @@ extern void percpu_free_rwsem(struct percpu_rw_semaphore *); #define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem) +#define percpu_rwsem_assert_held(sem) \ + lockdep_assert_held(&(sem)->rw_sem) + static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem, bool read, unsigned long ip) { |