6.1-stable review patch. If anyone has any objections, please let me know.
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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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/sqpoll.c | 1 - 1 file changed, 1 deletion(-)
--- 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