Re: [PATCH for-6.18/block 1/2] blk-cgroup: allocate policy data with GFP_NOIO in blkcg_activate_policy()

[Yu Kuai]

Hi,

在 2025/09/23 19:03, Ming Lei 写道:
> On Tue, Sep 23, 2025 at 4:06 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote:
> > From: Yu Kuai <yukuai3@xxxxxxxxxx>
> >
> > Queue is freezed while activating policy, allocate memory with queue
> > freezed has the risk of deadlock because memory reclaim can issue new
> > IO.
>
> blk_mq_freeze_queue() already covers it by calling memalloc_noio_save(),
> so this patch looks not necessary.
Yes, this can just consider a cleanup, I'll remove this if we think this
is not necessary.

> Or do you have a lockdep warning?

No.

Thanks,
Kuai

> Thanks,
>
>
>
> .