This little adjustment on bitwise operation could make the code a little faster. As write_iter is used in lots of critical path, so this code change is useful for performance.
Signed-off-by: Yafang Shao <[email protected]> --- mm/filemap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/filemap.c b/mm/filemap.c index 81adec8..a65056ea 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2881,7 +2881,8 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from) if (iocb->ki_flags & IOCB_APPEND) iocb->ki_pos = i_size_read(inode); - if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT)) + if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == + IOCB_NOWAIT) return -EINVAL; count = iov_iter_count(from); -- 1.8.3.1
