Re: [PATCH v2] mm/alloc_tag: clear codetag for pages allocated before page_ext initialization

[Suren Baghdasaryan <surenb@google.com>]

On Thu, Mar 26, 2026 at 6:34 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Thu, 26 Mar 2026 18:19:56 -0700 Suren Baghdasaryan <surenb@google.com> wrote:
>
> > >
> > > Do people use CONFIG_MEM_ALLOC_PROFILING_DEBUG much?  Is a backport
> > > really needed?
> >
> > IMO backport would be good.
>
> OK, thanks, I'll slap a cc:stable on it and keep it in the 7.1.rc1 queue.
>
> I added
>
> "This bug occurs when CONFIG_MEM_ALLOC_PROFILING_DEBUG=y."
>
> somewhere in the changelog but that's pretty lame and could be expanded
> upon in a respin.
>
> > >
> > > Either way, it seems that this isn't a very urgent issue so I'm
> > > inclined to add it to the 7.1-rc1 pile, perhaps with a cc:stable.
> > >
> > > Please all share your thoughts with me, thanks.
> >
> > I'm reviewing and testing the patch and there is a race and a couple
> > of smaller issues. I'll post a reply later today.
>
> Cool.  I was going to keep it in there for mm-new testing (which is
> light).  But I guess there isn't much value in this so I'll drop v2.
>
> Sashiko had a bunch of nags, but I think you're checking that routinely?
> https://sashiko.dev/#/patchset/20260326140554.191996-1-hao.ge%40linux.dev

Yep. Plus I finally got Sashiko to run on my local machine, so I will
give it a spin on my fixes before posting my reply.