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authorEric W. Biederman <ebiederm@xmission.com>2020-12-03 14:11:13 -0600
committerPeter Zijlstra <peterz@infradead.org>2020-12-09 17:08:42 +0100
commit31784cff7ee073b34d6eddabb95e3be2880a425c (patch)
treed1954eccd5b14129437e00b3d03e094a5dae7758 /include/linux/rwsem.h
parent0f9368b5bf6db0c04afc5454b1be79022a681615 (diff)
rwsem: Implement down_read_interruptible
In preparation for converting exec_update_mutex to a rwsem so that multiple readers can execute in parallel and not deadlock, add down_read_interruptible. This is needed for perf_event_open to be converted (with no semantic changes) from working on a mutex to wroking on a rwsem. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/87k0tybqfy.fsf@x220.int.ebiederm.org
Diffstat (limited to 'include/linux/rwsem.h')
-rw-r--r--include/linux/rwsem.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 13021b08b2ed..4c715be48717 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -123,6 +123,7 @@ static inline int rwsem_is_contended(struct rw_semaphore *sem)
* lock for reading
*/
extern void down_read(struct rw_semaphore *sem);
+extern int __must_check down_read_interruptible(struct rw_semaphore *sem);
extern int __must_check down_read_killable(struct rw_semaphore *sem);
/*