[PATCH][6.1][2/2] io_uring/sqpoll: Do not set PF_NO_SETAFFINITY on sqpoll threads

[Felix Moessbauer <felix.moessbauer@siemens.com>]

From: Michal Koutný <mkoutny@suse.com>

commit a5fc1441af7719e93dc7a638a960befb694ade89 upstream.

Users may specify a CPU where the sqpoll thread would run. This may
conflict with cpuset operations because of strict PF_NO_SETAFFINITY
requirement. That flag is unnecessary for polling "kernel" threads, see
the reasoning in commit 01e68ce08a30 ("io_uring/io-wq: stop setting
PF_NO_SETAFFINITY on io-wq workers"). Drop the flag on poll threads too.

Fixes: 01e68ce08a30 ("io_uring/io-wq: stop setting PF_NO_SETAFFINITY on io-wq workers")
Link: https://lore.kernel.org/all/20230314162559.pnyxdllzgw7jozgx@blackpad/
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Link: https://lore.kernel.org/r/20230314183332.25834-1-mkoutny@suse.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 io_uring/sqpoll.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
index 11610a70573a..6ea21b503113 100644
--- a/io_uring/sqpoll.c
+++ b/io_uring/sqpoll.c
@@ -233,7 +233,6 @@ static int io_sq_thread(void *data)
 		set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu));
 	else
 		set_cpus_allowed_ptr(current, cpu_online_mask);
-	current->flags |= PF_NO_SETAFFINITY;
 
 	/*
 	 * Force audit context to get setup, in case we do prep side async
-- 
2.39.2