Introduce down_killable()
down_killable() is the functional counterpart of mutex_lock_killable.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h
index b3c691b..88f2a28 100644
--- a/include/linux/semaphore.h
+++ b/include/linux/semaphore.h
@@ -62,6 +62,12 @@
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.