Re: [PATCH v2 4/4] mm: page_alloc: fix non-movable reclaim storm in defrag_mode

[Andrew Morton]

On Thu, 23 Jul 2026 12:22:58 +0200 "Vlastimil Babka (SUSE)" <vbabka@xxxxxxxxxx> wrote:

> + Greg and Sasha
> 
> On 7/23/26 01:22, Andrew Morton wrote:
> > On Wed, 22 Jul 2026 10:56:47 -0400 Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
> > 
> >> 
> >> Fixes: e3aa7df331bc ("mm: page_alloc: defrag_mode")
> >> Cc: <stable@xxxxxxxxxxxxxxx>
> >> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> > 
> > This cc:stable fix doesn't apply to current mainline because the
> > preceding non-cc:stable patches get in the way.
> > 
> > This means that the -stable maintainers will have to ask you to redo
> > the fix to make it backportable.  And you'll then be preparing a patch
> > which hasn't had standalone testing in mainline.  All very cumbersome.
> 
> Or they backport the whole series, even if only 4/4 has a Fixes: tag.

Sure.

> I don't think it's necessary, the stable team are quite capable of figuring
> out the deps and backporting them with a Stable-dep-off: tag.

What's that.

hp2:/usr/src/25> grep -ri stable-dep ../gitlog Documentation  
hp2:/usr/src/25> 

> IIRC the
> "fake" tagging is discouraged? Maybe they can clarify.