Re: Patch "dm delay: for short delays, use kthread instead of timers and wq" has been added to the 6.6-stable tree

[Sasha Levin <sashal@kernel.org>]

On Wed, Nov 29, 2023 at 07:16:52PM +0100, Mikulas Patocka wrote:
>
>
>On Wed, 29 Nov 2023, Sasha Levin wrote:
>
>> On Wed, Nov 29, 2023 at 06:28:16PM +0100, Mikulas Patocka wrote:
>> >
>> >
>> >On Wed, 29 Nov 2023, Christian Loehle wrote:
>> >
>> >> Hi Mikulas,
>> >> Agreed and thanks for fixing.
>> >> Has this been selected for stable because of:
>> >> 6fc45b6ed921 ("dm-delay: fix a race between delay_presuspend and
>> >> delay_bio")
>> >> If so, I would volunteer do the backports for that for you at least.
>> >
>> >I wouldn't backport this patch - it is an enhancement, not a bugfix, so it
>> >doesn't qualify for the stable kernel backports.
>>
>> Right - this watch was selected as a dependency for 6fc45b6ed921
>> ("dm-delay: fix a race between delay_presuspend and delay_bio").
>>
>> In general, unless it's impractical, we'd rather take a dependency chain
>> rather than deal with a non-trivial backport as those tend to have
>> issues longer term.
>>
>> --
>> Thanks,
>> Sasha
>
>The patch 70bbeb29fab0 ("dm delay: for short delays, use kthread instead
>of timers and wq") changes behavior of dm-delay from using timers to
>polling, so it may cause problems to people running legacy kernels - the
>polling consumes more CPU time than the timers - so I think it shouldn't
>go to the stable kernels where users expect that there will be no
>functional change.
>
>Here I'm submitting the patch 6fc45b6ed921 backported for 6.6.3.

Is this okay for 6.1 too?

-- 
Thanks,
Sasha