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From 339b3a147a8e17bd3c87f9c9b16ad2c3d8e517c9 Mon Sep 17 00:00:00 2001
From: Andrew Halaney <ahalaney@redhat.com>
Date: Tue, 6 Apr 2021 17:19:52 -0500
Subject: [PATCH 339/347] locking/rwsem-rt: Remove might_sleep() in __up_read()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
There's no chance of sleeping here, the reader is giving up the
lock and possibly waking up the writer who is waiting on it.
Reported-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
(cherry picked from commit b2ed0a4302faf2bb09e97529dd274233c082689b)
Signed-off-by: Clark Williams <williams@redhat.com>
---
kernel/locking/rwsem-rt.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/locking/rwsem-rt.c b/kernel/locking/rwsem-rt.c
index 19ea20be3fd7..966946454ced 100644
--- a/kernel/locking/rwsem-rt.c
+++ b/kernel/locking/rwsem-rt.c
@@ -200,7 +200,6 @@ void __up_read(struct rw_semaphore *sem)
if (!atomic_dec_and_test(&sem->readers))
return;
- might_sleep();
raw_spin_lock_irq(&m->wait_lock);
/*
* Wake the writer, i.e. the rtmutex owner. It might release the
--
2.36.1
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