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| author | Nilay Shroff <nilay@linux.ibm.com> | 2025-08-14 13:54:58 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:34:50 +0200 |
| commit | a277d8870a6c3a3d15b1b647c5f73ac1e6b7047f (patch) | |
| tree | 7d2109a9674f56430b1b6e3cea1fd34be1a60be3 /lib/cpu-notifier-error-inject.c | |
| parent | f9a9098ca82612006b9c71ce03b8fe189a437370 (diff) | |
block: decrement block_rq_qos static key in rq_qos_del()
[ Upstream commit ade1beea1c27657712aa8f594226d461639382ff ]
rq_qos_add() increments the block_rq_qos static key when a QoS
policy is attached. When a QoS policy is removed via rq_qos_del(),
we must symmetrically decrement the static key. If this removal drops
the last QoS policy from the queue (q->rq_qos becomes NULL), the
static branch can be disabled and the jump label patched to a NOP,
avoiding overhead on the hot path.
This change ensures rq_qos_add()/rq_qos_del() keep the
block_rq_qos static key balanced and prevents leaving the branch
permanently enabled after the last policy is removed.
Fixes: 033b667a823e ("block: blk-rq-qos: guard rq-qos helpers by static key")
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20250814082612.500845-3-nilay@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib/cpu-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions