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| author |   Oleg Nesterov <oleg@redhat.com> | 2015-07-21 20:26:44 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2015-08-15 13:52:10 +0200 |
| commit | 55cc156505f2e43fa45dbd4bfe8f9c9d848ca44c (patch) | |
| tree | 18e5e34c2621de27c4833d834e05213c46587478 | |
| parent | percpu-rwsem: introduce percpu_down_read_trylock() (diff) | |
| download | linux-dev-55cc156505f2e43fa45dbd4bfe8f9c9d848ca44c.tar.xz linux-dev-55cc156505f2e43fa45dbd4bfe8f9c9d848ca44c.zip | |
percpu-rwsem: introduce percpu_rwsem_release() and percpu_rwsem_acquire()
Add percpu_rwsem_release() and percpu_rwsem_acquire() for the users
which need to return to userspace with percpu-rwsem lock held and/or
pass the ownership to another thread.
TODO: change percpu_rwsem_release() to use rwsem_clear_owner(). We can
either fold kernel/locking/rwsem.h into include/linux/rwsem.h, or add
the non-inline percpu_rwsem_clear_owner().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
| -rw-r--r-- | include/linux/percpu-rwsem.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index 16c30cd33501..834c4e52cb2d 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -32,4 +32,23 @@ extern void percpu_free_rwsem(struct percpu_rw_semaphore *); __percpu_init_rwsem(brw, #brw, &rwsem_key); \ }) + +#define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem) + +static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem, + bool read, unsigned long ip) +{ + lock_release(&sem->rw_sem.dep_map, 1, ip); +#ifdef CONFIG_RWSEM_SPIN_ON_OWNER + if (!read) + sem->rw_sem.owner = NULL; +#endif +} + +static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem, + bool read, unsigned long ip) +{ + lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip); +} + #endif |