Re: [PATCH v2] gpu: Fix uninitialized buddy for built-in drivers

["Danilo Krummrich" <dakr@kernel.org>]

On Mon Feb 16, 2026 at 12:19 PM CET, Koen Koning wrote:
> Use subsys_initcall instead of module_init for the GPU buddy allocator,
> so its initialization code runs before any gpu drivers.
> Otherwise, a built-in driver that tries to use the buddy allocator will
> run into a kernel NULL pointer dereference because slab_blocks is
> uninitialized.
>
> Specifically, this fixes drm/xe (as built-in) running into a kernel
> panic during boot, because it uses buddy during device probe.

I just noticed that this patch was sent twice, and I posted my feedback on [1]
-- pasting it here as well.

> Fixes: ba110db8e1bc ("gpu: Move DRM buddy allocator one level up (part two)")

This Fixes: tag seems wrong. How is this code move related to this problem?

This should rather be:

Fixes: 6387a3c4b0c4 ("drm: move the buddy allocator from i915 into common drm")

Also, please add:

Cc: stable@vger.kernel.org

> Cc: Joel Fernandes <joelagnelf@nvidia.com>
> Cc: Dave Airlie <airlied@redhat.com>
> Cc: intel-xe@lists.freedesktop.org
> Cc: Peter Senna Tschudin <peter.senna@linux.intel.com>
> Cc: Matthew Auld <matthew.auld@intel.com>
> Signed-off-by: Koen Koning <koen.koning@linux.intel.com>

[1] https://lore.kernel.org/all/DGIUUFLC31D5.2OZBF5FWQJWMZ@kernel.org/