leverage xor to simplify code in __io_worker_busy
Signed-off-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
---
fs/io-wq.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/fs/io-wq.c b/fs/io-wq.c
index 433c4d3c3c1c..8d8324eba2ec 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -276,10 +276,12 @@ static void io_wqe_dec_running(struct io_worker *worker)
*/
static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker,
struct io_wq_work *work)
- __must_hold(wqe->lock)
+ __must_hold(w qe->lock)
{
bool worker_bound, work_bound;
+ BUILD_BUG_ON((IO_WQ_ACCT_UNBOUND ^ IO_WQ_ACCT_BOUND) != 1);
+
if (worker->flags & IO_WORKER_F_FREE) {
worker->flags &= ~IO_WORKER_F_FREE;
hlist_nulls_del_init_rcu(&worker->nulls_node);
@@ -292,16 +294,11 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker,
worker_bound = (worker->flags & IO_WORKER_F_BOUND) != 0;
work_bound = (work->flags & IO_WQ_WORK_UNBOUND) == 0;
if (worker_bound != work_bound) {
+ int index = work_bound ? IO_WQ_ACCT_UNBOUND : IO_WQ_ACCT_BOUND;
io_wqe_dec_running(worker);
- if (work_bound) {
- worker->flags |= IO_WORKER_F_BOUND;
- wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers--;
- wqe->acct[IO_WQ_ACCT_BOUND].nr_workers++;
- } else {
- worker->flags &= ~IO_WORKER_F_BOUND;
- wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers++;
- wqe->acct[IO_WQ_ACCT_BOUND].nr_workers--;
- }
+ worker->flags ^= IO_WORKER_F_BOUND;
+ wqe->acct[index].nr_workers--;
+ wqe->acct[index ^ 1].nr_workers++;
io_wqe_inc_running(worker);
}
}
--
1.8.3.1
