diff options
Diffstat (limited to 'debian/patches-rt/0339-locking-rwsem-rt-Remove-might_sleep-in-__up_read.patch')
| -rw-r--r-- | debian/patches-rt/0339-locking-rwsem-rt-Remove-might_sleep-in-__up_read.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/debian/patches-rt/0339-locking-rwsem-rt-Remove-might_sleep-in-__up_read.patch b/debian/patches-rt/0339-locking-rwsem-rt-Remove-might_sleep-in-__up_read.patch new file mode 100644 index 000000000..3edc4a486 --- /dev/null +++ b/debian/patches-rt/0339-locking-rwsem-rt-Remove-might_sleep-in-__up_read.patch @@ -0,0 +1,33 @@ +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 + |