[PATCH] mm: shmem: fix the shmem large folio allocation for the i915 driver

[Andrew Morton]

On Mon, 28 Jul 2025 23:59:22 +0200 Patryk Kowalczyk <patryk at kowalczyk.ws> wrote:

> In my tests, the performance drop ranges from a few percent up to 13% in
> Unigine Superposition
> under heavy memory usage on the CPU Core Ultra 155H with the Xe 128 EU GPU.
> Other users have reported performance impact up to 30% on certain workloads.
> Please find more  in the regressions reports:
> https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14645
> https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13845
> 
> I believe the change should be backported to all active kernel branches
> after version 6.12.

OK, thanks.  I added this (important!) info to the changelog and I
added a cc:stable, requesting a backport into everything which has
acd7ccb284b8.

I'll place this in mm.git's mm-hotfixes-unstable branch with a plan to
upstream it sometime during the 6.17-rcX cycle.