diff options
Diffstat (limited to 'module/spl/spl-rwlock.c')
| -rw-r--r-- | module/spl/spl-rwlock.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/module/spl/spl-rwlock.c b/module/spl/spl-rwlock.c index 9b356a843..77f46f2d6 100644 --- a/module/spl/spl-rwlock.c +++ b/module/spl/spl-rwlock.c @@ -32,7 +32,7 @@ #define DEBUG_SUBSYSTEM S_RWLOCK -#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK +#if defined(CONFIG_RWSEM_GENERIC_SPINLOCK) static int __rwsem_tryupgrade(struct rw_semaphore *rwsem) { @@ -47,6 +47,15 @@ __rwsem_tryupgrade(struct rw_semaphore *rwsem) spl_rwsem_unlock_irqrestore(&rwsem->wait_lock, flags); return (ret); } +#elif defined(HAVE_RWSEM_ATOMIC_LONG_COUNT) +static int +__rwsem_tryupgrade(struct rw_semaphore *rwsem) +{ + long val; + val = atomic_long_cmpxchg(&rwsem->count, SPL_RWSEM_SINGLE_READER_VALUE, + SPL_RWSEM_SINGLE_WRITER_VALUE); + return (val == SPL_RWSEM_SINGLE_READER_VALUE); +} #else static int __rwsem_tryupgrade(struct rw_semaphore *rwsem) |