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authorJosef Bacik <josef@toxicpanda.com>2018-07-11 10:34:42 -0400
committerJens Axboe <axboe@kernel.dk>2018-07-11 08:37:38 -0600
commita284390b397ae2f95de799bc591efbfe54bf0907 (patch)
tree07136f08be61683a7ccfdbf3af286dec401880cc
parent88b7210c81096c018f5836aff4749743c0d34623 (diff)
downloadlinux-a284390b397ae2f95de799bc591efbfe54bf0907.tar.bz2
blk-iolatency: fix max_depth comparisons
max_depth used to be a u64, but I changed it to a unsigned int but didn't convert my comparisons over everywhere. Fix by using UINT_MAX everywhere instead of (u64)-1. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-iolatency.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 56ddb2c68752..b59e5451680b 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -9,8 +9,8 @@
* - We use the mean latency over the 100ms window. This is because writes can
* be particularly fast, which could give us a false sense of the impact of
* other workloads on our protected workload.
- * - By default there's no throttling, we set the queue_depth to INT_MAX so that
- * we can have as many outstanding bio's as we're allowed to. Only at
+ * - By default there's no throttling, we set the queue_depth to UINT_MAX so
+ * that we can have as many outstanding bio's as we're allowed to. Only at
* throttle time do we pay attention to the actual queue depth.
*
* The hierarchy works like the cpu controller does, we track the latency at
@@ -361,7 +361,7 @@ static void check_scale_change(struct iolatency_grp *iolat)
/* We're back to the default cookie, unthrottle all the things. */
if (cur_cookie == DEFAULT_SCALE_COOKIE) {
blkcg_clear_delay(lat_to_blkg(iolat));
- iolat->rq_depth.max_depth = INT_MAX;
+ iolat->rq_depth.max_depth = UINT_MAX;
wake_up_all(&iolat->rq_wait.wait);
return;
}
@@ -434,7 +434,7 @@ static void iolatency_record_time(struct iolatency_grp *iolat,
* We don't want to count issue_as_root bio's in the cgroups latency
* statistics as it could skew the numbers downwards.
*/
- if (unlikely(issue_as_root && iolat->rq_depth.max_depth != (u64)-1)) {
+ if (unlikely(issue_as_root && iolat->rq_depth.max_depth != UINT_MAX)) {
u64 sub = iolat->min_lat_nsec;
if (req_time < sub)
blkcg_add_delay(lat_to_blkg(iolat), now, sub - req_time);
@@ -816,7 +816,7 @@ static size_t iolatency_pd_stat(struct blkg_policy_data *pd, char *buf,
struct iolatency_grp *iolat = pd_to_lat(pd);
unsigned long long avg_lat = div64_u64(iolat->total_lat_avg, NSEC_PER_USEC);
- if (iolat->rq_depth.max_depth == (u64)-1)
+ if (iolat->rq_depth.max_depth == UINT_MAX)
return scnprintf(buf, size, " depth=max avg_lat=%llu",
avg_lat);
@@ -859,7 +859,7 @@ static void iolatency_pd_init(struct blkg_policy_data *pd)
rq_wait_init(&iolat->rq_wait);
spin_lock_init(&iolat->child_lat.lock);
iolat->rq_depth.queue_depth = blk_queue_depth(blkg->q);
- iolat->rq_depth.max_depth = INT_MAX;
+ iolat->rq_depth.max_depth = UINT_MAX;
iolat->rq_depth.default_depth = iolat->rq_depth.queue_depth;
iolat->blkiolat = blkiolat;
iolat->cur_win_nsec = 100 * NSEC_PER_MSEC;