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| author | Pavel Begunkov <asml.silence@gmail.com> | 2020-08-20 11:34:10 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-08-20 05:36:17 -0600 |
| commit | f261c16861b82951bd2125706660ce4602930563 (patch) | |
| tree | e29535552e257ac2733a0c44866ce6c29f0d0cba | |
| parent | bb175342aa64e6c6f1d04f5235502121d6ff0247 (diff) | |
io_uring: comment on kfree(iovec) checks
kfree() handles NULL pointers well, but io_{read,write}() checks it
because of performance reasons. Leave a comment there for those who are
tempted to patch it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | fs/io_uring.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index d43a20a554e4..b9ca5a54dc20 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3204,6 +3204,7 @@ done: kiocb_done(kiocb, ret, cs); ret = 0; out_free: + /* it's reportedly faster than delegating the null check to kfree() */ if (iovec) kfree(iovec); return ret; @@ -3300,6 +3301,7 @@ copy_iov: return -EAGAIN; } out_free: + /* it's reportedly faster than delegating the null check to kfree() */ if (iovec) kfree(iovec); return ret; |