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UPSTREAM: block: increase BLKCG_MAX_POLS

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After mq-deadline learned to deal with cgroups, the BLKCG_MAX_POLS value
became too small for all the elevators to be registered properly. The
following issue is seen:

```
calling  bfq_init+0x0/0x8b @ 1
blkcg_policy_register: BLKCG_MAX_POLS too small
initcall bfq_init+0x0/0x8b returned -28 after 507 usecs
```

which renders BFQ non-functional.

Increase BLKCG_MAX_POLS to allow enough space for everyone.

Fixes: 08a9ad8bf6 ("block/mq-deadline: Add cgroup support")
Link: https://lore.kernel.org/lkml/8988303.mDXGIdCtx8@natalenko.name/
Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Link: https://lore.kernel.org/r/20210717123328.945810-1-oleksandr@natalenko.name
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit ec645dc966)
Change-Id: Ida96ed26a79e8ec99609113832c61c6da1c24c4a
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Oleksandr Natalenko
2021-07-17 14:33:28 +02:00
committed by Bart Van Assche
parent 9c8e037fc8
commit b6bacbee14
1 changed files with 1 additions and 1 deletions
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2
include/linux/blkdev.h
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@@ -59,7 +59,7 @@ struct blk_keyslot_manager;
* Maximum number of blkcg policies allowed to be registered concurrently.
* Defined here to simplify include dependency.
*/
#define BLKCG_MAX_POLS 5
#define BLKCG_MAX_POLS 6
typedef void (rq_end_io_fn)(struct request *, blk_status_t);