Re: amusing SLUB compaction bug when CC_OPTIMIZE_FOR_SIZE

[Joel Fernandes]

> On Sep 28, 2022, at 1:56 PM, Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx> wrote:
> 
> On Wed, Sep 28, 2022 at 06:20:10PM +0200, Vlastimil Babka wrote:
[..]
>>>> Thank you for report!
>>>> 
>>>> That should be due to commit 65505d1f2338e7
>>>> ("mm/sl[au]b: rearrange struct slab fields to allow larger rcu_head")
>>>> as now rcu_head can use some bits that shares with mapping.
>>>> 
>>>> Hmm IMO we have two choices...
>>>> 
>>>> 1. simply drop the commit as it's only for debugging (RCU folks may not like [1])
>>> 
>>> Yeah definitely don't like this option as patches are out that depend on
>>> this (not yet merged though). :-)
>> 
>> But we'll have to do that for now and postpone to 6.2 I'm afraid as merge
>> window for 6.1 is too close to have confidence in any solution that we came
>> up this moment.

I am ok with your postponing till then, gives me time to get other patches in, in the mean while :-)

Thanks again for your work on this,

 - Joel