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authorArnd Bergmann <arnd@arndb.de>2018-07-10 17:21:34 +0200
committerJens Axboe <axboe@kernel.dk>2018-07-10 12:26:09 -0600
commit88b7210c81096c018f5836aff4749743c0d34623 (patch)
tree903f498b0a692ad8dd3cb22f4232d04aff5cc201 /block/blk-iolatency.c
parent3993e501bf853cce85c5114a704b86b8f486790c (diff)
downloadlinux-88b7210c81096c018f5836aff4749743c0d34623.tar.bz2
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: d70675121546 ("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>
Diffstat (limited to 'block/blk-iolatency.c')
-rw-r--r--block/blk-iolatency.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index a35a1f580337..56ddb2c68752 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -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;
}