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-rw-r--r--include/linux/semaphore.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h
index b3c691b089b2..88f2a28cc0f1 100644
--- a/include/linux/semaphore.h
+++ b/include/linux/semaphore.h
@@ -62,6 +62,12 @@ extern void down(struct semaphore *sem);
extern int __must_check down_interruptible(struct semaphore *sem);
/*
+ * As down_interruptible(), except the sleep may only be interrupted by
+ * signals which are fatal to this process.
+ */
+extern int __must_check down_killable(struct semaphore *sem);
+
+/*
* As down(), except this function will not sleep. It will return 0 if it
* acquired the semaphore and 1 if the semaphore was contended. This
* function may be called from any context, including interrupt and softirq.