Re: [GIT PULL] TEE shared memory fix for 7.0

[Jens Wiklander]

Hi,

On Tue, Mar 17, 2026 at 9:51 AM Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
>
> On Mon, Mar 16, 2026 at 08:41:50AM +0100, Jens Wiklander wrote:
> > Hello arm-soc maintainers,
> >
> > Please pull this patch removing the refcounting of kernel pages within
> > the TEE shared memory helper.
> >
> > Thanks,
> > Jens
> >
> > The following changes since commit 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f:
> >
> >   Linux 7.0-rc1 (2026-02-22 13:18:59 -0800)
> >
> > are available in the Git repository at:
> >
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git tags/tee-fix-for-v7.0
> >
> > for you to fetch changes up to 08d9a4580f71120be3c5b221af32dca00a48ceb0:
> >
> >   tee: shm: Remove refcounting of kernel pages (2026-03-03 09:03:04 +0100)
> >
> > ----------------------------------------------------------------
> > TEE shared memory update for 7.0
> >
> > Remove refcounting of kernel pages in register_shm_helper() to support
> > slab allocations.
>
> That's a supposed fix for a year old commit, not current RC, and the
> commit msg does not explain what is the bug being fixed here. Looks like
> it is doing improvement, not a fix. Can you provide here more
> explanation of the actual bug being fixed to justify this going to
> current RC fixes?

I'm under the impression that it is a fix rather than an improvement.
However, since it has been stewing for a while, it's clearly not
urgent. I don't have anything specific on the bug fix, other than that
we're supposed to stop taking those refcounts. Perhaps Sumit, Marco,
or Matthew can add something?

Cheers,
Jens