On Tue, 06 Feb 2024, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> Hi all,
>
> After merging the drm-misc tree, today's linux-next build (i386 defconfig)
> failed like this:
>
> In function 'i915_ttm_placement_from_obj',
> inlined from 'i915_ttm_get_pages' at drivers/gpu/drm/i915/gem/i915_gem_ttm.c:847:2:
> drivers/gpu/drm/i915/gem/i915_gem_ttm.c:165:18: error: 'places[0].flags' is used uninitialized [-Werror=uninitialized]
> 165 | places[0].flags |= TTM_PL_FLAG_DESIRED;
> | ~~~~~~~~~^~~~~~
> drivers/gpu/drm/i915/gem/i915_gem_ttm.c: In function 'i915_ttm_get_pages':
> drivers/gpu/drm/i915/gem/i915_gem_ttm.c:837:26: note: 'places' declared here
> 837 | struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
> | ^~~~~~
>
> Caused by commit
>
> a78a8da51b36 ("drm/ttm: replace busy placement with flags v6")
Cc: more people.
>
> I applied the following hack for today:
>
> From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Date: Tue, 6 Feb 2024 15:17:54 +1100
> Subject: [PATCH] drm/ttm: initialise places
>
> Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> index 80c6cafc8887..34e699e67c25 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> @@ -834,7 +834,7 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
>
> static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)
> {
> - struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
> + struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1] = {};
> struct ttm_placement placement;
>
> /* restricted by sg_alloc_table */
> --
> 2.43.0
--
Jani Nikula, Intel
