From: Jens Axboe <axboe@kernel.dk>
Date: Sat, 13 Mar 2021 03:20:42 +0000 (-0700)
Subject: kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=15b2219facadec583c24523eed40fa45865f859f;p=linux.git

kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing

Don't send fake signals to PF_IO_WORKER threads, they don't accept
signals. Just treat them like kthreads in this regard, all they need
is a wakeup as no forced kernel/user transition is needed.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/kernel/freezer.c b/kernel/freezer.c
index dc520f01f99dd..1a2d57d1327cd 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -134,7 +134,7 @@ bool freeze_task(struct task_struct *p)
 		return false;
 	}
 
-	if (!(p->flags & PF_KTHREAD))
+	if (!(p->flags & (PF_KTHREAD | PF_IO_WORKER)))
 		fake_signal_wake_up(p);
 	else
 		wake_up_state(p, TASK_INTERRUPTIBLE);