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")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
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;
}
--
2.9.0
