From 7131b777e7276a566838fdfb4a0b2ddc44ad2eca Mon Sep 17 00:00:00 2001 From: Andrew Halaney Date: Tue, 6 Apr 2021 17:19:52 -0500 Subject: [PATCH 297/323] locking/rwsem-rt: Remove might_sleep() in __up_read() Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.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 Signed-off-by: Andrew Halaney Signed-off-by: Steven Rostedt (VMware) --- 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 274172d5bb3a..b61edc4dcb73 100644 --- a/kernel/locking/rwsem-rt.c +++ b/kernel/locking/rwsem-rt.c @@ -198,7 +198,6 @@ 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 -- 2.43.0