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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 19 Jan 2021 18:54:33 +0100
Subject: [PATCH 335/342] locking/rwsem_rt: Add __down_read_interruptible()
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=95f51b5f0caacd4978a39b16473ca035f8047fdf
The stable backported a patch which adds __down_read_interruptible() for
the generic rwsem implementation.
Add RT's version __down_read_interruptible().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/rwsem_rt.h | 1 +
kernel/locking/rwsem-rt.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/include/linux/rwsem_rt.h b/include/linux/rwsem_rt.h
index 2018ff77904a..3fb092b7bcc0 100644
--- a/include/linux/rwsem_rt.h
+++ b/include/linux/rwsem_rt.h
@@ -56,6 +56,7 @@ static inline int rwsem_is_contended(struct rw_semaphore *sem)
}
extern void __down_read(struct rw_semaphore *sem);
+extern int __down_read_interruptible(struct rw_semaphore *sem);
extern int __down_read_killable(struct rw_semaphore *sem);
extern int __down_read_trylock(struct rw_semaphore *sem);
extern void __down_write(struct rw_semaphore *sem);
diff --git a/kernel/locking/rwsem-rt.c b/kernel/locking/rwsem-rt.c
index f518495bd6cc..19ea20be3fd7 100644
--- a/kernel/locking/rwsem-rt.c
+++ b/kernel/locking/rwsem-rt.c
@@ -166,6 +166,17 @@ void __down_read(struct rw_semaphore *sem)
WARN_ON_ONCE(ret);
}
+int __down_read_interruptible(struct rw_semaphore *sem)
+{
+ int ret;
+
+ ret = __down_read_common(sem, TASK_INTERRUPTIBLE);
+ if (likely(!ret))
+ return ret;
+ WARN_ONCE(ret != -EINTR, "Unexpected state: %d\n", ret);
+ return -EINTR;
+}
+
int __down_read_killable(struct rw_semaphore *sem)
{
int ret;
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