Re: [PATCH v3 0/3] page_owner: Fix refcount imbalance

[Palmer Dabbelt]

On Thu, 28 Mar 2024 23:39:33 PDT (-0700), alex@xxxxxxxx wrote:
> Hi Oscar,
>
> On 26/03/2024 07:30, Oscar Salvador wrote:
> > This series consists of a refactoring/correctness of updating the metadata
> > of tail pages and a couple of fixups for the refcounting part.
> >
> >  From this series on, instead of counting the stacks, we count the outstanding
> > nr_base_pages each stack has, which gives us a much better memory overview.
> > The other fixup is for the migration part.
> >
> > A more detailed explanation can be found in the changelog of the respective
> > patches.
> >
> > Oscar Salvador (3):
> >    mm,page_owner: Update metada for tail pages
> >    mm,page_owner: Fix refcount imbalance
> >    mm,page_owner: Fix accounting of pages when migrating
> >
> >   Documentation/mm/page_owner.rst |  73 +++++++------
> >   mm/page_owner.c                 | 184 +++++++++++++++++++-------------
> >   2 files changed, 146 insertions(+), 111 deletions(-)
>
> This fixes the following report from syzbot:
> https://lore.kernel.org/linux-riscv/00000000000070a2660614b83885@xxxxxxxxxx/T/#t
>
> So you can add:
>
> Tested-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>

in case that helps any, but I think this is one for the MM folks  Thanks 
for chasing down the fix!

> Thanks,
>
> Alex