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authorOleg Nesterov <oleg@redhat.com>2015-07-21 20:26:44 +0200
committerOleg Nesterov <oleg@redhat.com>2015-08-15 13:52:10 +0200
commit55cc156505f2e43fa45dbd4bfe8f9c9d848ca44c (patch)
tree18e5e34c2621de27c4833d834e05213c46587478 /include/linux/percpu-rwsem.h
parent9287f6925ad9d8fb8c6283066b4f77fd87f123a9 (diff)
downloadop-kernel-dev-55cc156505f2e43fa45dbd4bfe8f9c9d848ca44c.zip
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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>
Diffstat (limited to 'include/linux/percpu-rwsem.h')
-rw-r--r--include/linux/percpu-rwsem.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h
index 16c30cd..834c4e5 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
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