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| author | Wen Yang <wenyang@linux.alibaba.com> | 2020-01-13 16:29:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-13 18:19:02 -0800 |
| commit | 0a5d1a7f64702c351d1f47ef159a0df8c71be0b0 (patch) | |
| tree | ea7c0f98755658d1bff26684fac3957d2b3b2251 | |
| parent | d3ac946ec9de10ec4b9718ad30703c5e077916a1 (diff) | |
| download | linux-0a5d1a7f64702c351d1f47ef159a0df8c71be0b0.tar.bz2 | |
mm/page-writeback.c: improve arithmetic divisions
Use div64_ul() instead of do_div() if the divisor is unsigned long, to
avoid truncation to 32-bit on 64-bit platforms.
Link: http://lkml.kernel.org/r/20200102081442.8273-4-wenyang@linux.alibaba.com
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Qian Cai <cai@lca.pw>
Cc: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page-writeback.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index c74c6bd6540b..2caf780a42e7 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1102,7 +1102,7 @@ static void wb_update_write_bandwidth(struct bdi_writeback *wb, bw = written - min(written, wb->written_stamp); bw *= HZ; if (unlikely(elapsed > period)) { - do_div(bw, elapsed); + bw = div64_ul(bw, elapsed); avg = bw; goto out; } |