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bcache: Fix a compiler warning in bcache_device_init()

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Avoid that building with W=1 triggers the following compiler warning:

drivers/md/bcache/super.c:776:20: warning: comparison is always false due to limited range of data type [-Wtype-limits]
      d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) {
                    ^

Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2018-03-18 17:36:33 -07:00 committed by Jens Axboe
parent 20d3a51871
commit 5f2b18ec8e
1 changed files with 3 additions and 3 deletions
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6
drivers/md/bcache/super.c
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@ -778,6 +778,8 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
sector_t sectors)
{
struct request_queue *q;
const size_t max_stripes = min_t(size_t, INT_MAX,
SIZE_MAX / sizeof(atomic_t));
size_t n;
int idx;
@ -786,9 +788,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size);
if (!d->nr_stripes ||
d->nr_stripes > INT_MAX ||
d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) {
if (!d->nr_stripes || d->nr_stripes > max_stripes) {
pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)",
(unsigned)d->nr_stripes);
return -ENOMEM;