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block: iolatency: avoid 64-bit division 

On 32-bit architectures, dividing a 64-bit number needs to use the
do_div() function or something like it to avoid a link failure:

block/blk-iolatency.o: In function `iolatency_prfill_limit':
blk-iolatency.c:(.text+0x8cc): undefined reference to `__aeabi_uldivmod'

Using div_u64() gives us the best output and avoids the need for an
explicit cast.

Fixes: d706751215 ("block: introduce blk-iolatency io controller")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Arnd Bergmann 2018-07-10 17:21:34 +02:00 committed by Jens Axboe
parent 3993e501bf
commit 88b7210c81
1 changed files with 1 additions and 2 deletions
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3
block/blk-iolatency.c
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@ -798,8 +798,7 @@ static u64 iolatency_prfill_limit(struct seq_file *sf,
if (!dname || !iolat->min_lat_nsec)
return 0;
seq_printf(sf, "%s target=%llu\n",
dname,
(unsigned long long)iolat->min_lat_nsec / NSEC_PER_USEC);
dname, div_u64(iolat->min_lat_nsec, NSEC_PER_USEC));
return 0;
}