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io_uring: only call kfree() for a non-zero pointer

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It's safe to call kfree() with a NULL pointer, but it's also pointless.
Most of the time we don't have any data to free, and at millions of
requests per second, the redundant function call adds noticeable
overhead (about 1.3% of the runtime).

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-07-08 15:15:26 -06:00
parent aa340845ae
commit 5acbbc8ed3
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -1519,7 +1519,8 @@ static void io_dismantle_req(struct io_kiocb *req)
if (req->flags & REQ_F_NEED_CLEANUP)
io_cleanup_req(req);
kfree(req->io);
if (req->io)
kfree(req->io);
if (req->file)
io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
__io_put_req_task(req);