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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-04-11 21:43:15 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-04-11 08:37:56 -0600 |
| commit | 62594f189e81caffa6a3bfa2fdb08eec2e347c76 (patch) | |
| tree | b1bec7cea760039f0403c9488cc58a80a173034b /drivers/md/bcache | |
| parent | 9c9b81c45619e76d315eb3b9934e9d4bfa7d3bcd (diff) | |
| download | lwn-62594f189e81caffa6a3bfa2fdb08eec2e347c76.tar.gz lwn-62594f189e81caffa6a3bfa2fdb08eec2e347c76.zip | |
bcache: Use 64-bit arithmetic instead of 32-bit
Cast multiple variables to (int64_t) in order to give the compiler
complete information about the proper arithmetic to use. Notice that
these variables are being used in contexts that expect expressions of
type int64_t (64 bit, signed). And currently, such expressions are
being evaluated using 32-bit arithmetic.
Fixes: d0cf9503e908 ("octeontx2-pf: ethtool fec mode support")
Addresses-Coverity-ID: 1501724 ("Unintentional integer overflow")
Addresses-Coverity-ID: 1501725 ("Unintentional integer overflow")
Addresses-Coverity-ID: 1501726 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20210411134316.80274-7-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/bcache')
| -rw-r--r-- | drivers/md/bcache/writeback.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index bcd550a2b0da..8120da278161 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -110,13 +110,13 @@ static void __update_writeback_rate(struct cached_dev *dc) int64_t fps; if (c->gc_stats.in_use <= BCH_WRITEBACK_FRAGMENT_THRESHOLD_MID) { - fp_term = dc->writeback_rate_fp_term_low * + fp_term = (int64_t)dc->writeback_rate_fp_term_low * (c->gc_stats.in_use - BCH_WRITEBACK_FRAGMENT_THRESHOLD_LOW); } else if (c->gc_stats.in_use <= BCH_WRITEBACK_FRAGMENT_THRESHOLD_HIGH) { - fp_term = dc->writeback_rate_fp_term_mid * + fp_term = (int64_t)dc->writeback_rate_fp_term_mid * (c->gc_stats.in_use - BCH_WRITEBACK_FRAGMENT_THRESHOLD_MID); } else { - fp_term = dc->writeback_rate_fp_term_high * + fp_term = (int64_t)dc->writeback_rate_fp_term_high * (c->gc_stats.in_use - BCH_WRITEBACK_FRAGMENT_THRESHOLD_HIGH); } fps = div_s64(dirty, dirty_buckets) * fp_term; |