From: Andrew Halaney Date: Tue, 6 Apr 2021 17:19:52 -0500 Subject: [PATCH 336/342] locking/rwsem-rt: Remove might_sleep() in __up_read() Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=f4cae546c87033b52ee5a80dc860427ebd02568e 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 Signed-off-by: Andrew Halaney Signed-off-by: Steven Rostedt (VMware) (cherry picked from commit b2ed0a4302faf2bb09e97529dd274233c082689b) Signed-off-by: Clark Williams --- 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