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| author | Pavel Begunkov <asml.silence@gmail.com> | 2020-08-01 13:36:33 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-08-01 11:02:00 -0600 |
| commit | 1752f0adea98ef859978c090e0726844348758f9 (patch) | |
| tree | 8aba110d49827532706a9646c45557e70a07243a | |
| parent | d1719f70d0a5b83b12786a7dbc5b9fe396469016 (diff) | |
| download | lwn-1752f0adea98ef859978c090e0726844348758f9.tar.gz lwn-1752f0adea98ef859978c090e0726844348758f9.zip | |
fs: optimise kiocb_set_rw_flags()
Use a local var to collect flags in kiocb_set_rw_flags(). That spares
some memory writes and allows to replace most of the jumps with MOVEcc.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/fs.h | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 4090320360f4..e535543d31d9 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3446,22 +3446,28 @@ static inline int iocb_flags(struct file *file) static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) { + int kiocb_flags = 0; + + if (!flags) + return 0; if (unlikely(flags & ~RWF_SUPPORTED)) return -EOPNOTSUPP; if (flags & RWF_NOWAIT) { if (!(ki->ki_filp->f_mode & FMODE_NOWAIT)) return -EOPNOTSUPP; - ki->ki_flags |= IOCB_NOWAIT; + kiocb_flags |= IOCB_NOWAIT; } if (flags & RWF_HIPRI) - ki->ki_flags |= IOCB_HIPRI; + kiocb_flags |= IOCB_HIPRI; if (flags & RWF_DSYNC) - ki->ki_flags |= IOCB_DSYNC; + kiocb_flags |= IOCB_DSYNC; if (flags & RWF_SYNC) - ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); + kiocb_flags |= (IOCB_DSYNC | IOCB_SYNC); if (flags & RWF_APPEND) - ki->ki_flags |= IOCB_APPEND; + kiocb_flags |= IOCB_APPEND; + + ki->ki_flags |= kiocb_flags; return 0; } |