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authorJens Axboe <axboe@kernel.dk>2018-09-11 10:59:53 -0600
committerJens Axboe <axboe@kernel.dk>2018-09-11 10:59:53 -0600
commit01c5f85aebaaddfd7e6051fb2ec80c1d4b463554 (patch)
tree1bec8d2fd88742a5396eb359a087c59dfa8fa08e /block/blk-cgroup.c
parentbf93585ee1e25461426c61e5ff64a3acd9e30e88 (diff)
blk-cgroup: increase number of supported policies
After merging the iolatency policy, we potentially now have 4 policies being registered, but only support 3. This causes one of them to fail loading. Takashi reports that BFQ no longer works for him, because it fails to load due to policy registration failure. Bump to 5 policies, and also add a warning for when we have exceeded the global amount. If we have to touch this again, we should switch to a dynamic scheme instead. Reported-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Tested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-cgroup.c')
-rw-r--r--block/blk-cgroup.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index c19f9078da1e..c630e02836a8 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1510,8 +1510,10 @@ int blkcg_policy_register(struct blkcg_policy *pol)
for (i = 0; i < BLKCG_MAX_POLS; i++)
if (!blkcg_policy[i])
break;
- if (i >= BLKCG_MAX_POLS)
+ if (i >= BLKCG_MAX_POLS) {
+ pr_warn("blkcg_policy_register: BLKCG_MAX_POLS too small\n");
goto err_unlock;
+ }
/* Make sure cpd/pd_alloc_fn and cpd/pd_free_fn in pairs */
if ((!pol->cpd_alloc_fn ^ !pol->cpd_free_fn) ||