From 88b7210c81096c018f5836aff4749743c0d34623 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 10 Jul 2018 17:21:34 +0200 Subject: [PATCH] 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 Signed-off-by: Arnd Bergmann Signed-off-by: Jens Axboe --- block/blk-iolatency.c | 3 +-- 1 file changed, 1 insertion(+), 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; }