io_uring/sqpoll: Do not set PF_NO_SETAFFINITY on sqpoll threads

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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
index 0119d3f1a55698a9958d26d9baadb68e3028141a..9db4bc1f521a3162d3480000cdc82e9a1aacfe62 100644 (file)
--- 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;
 
        mutex_lock(&sqd->lock);
        while (1) {