linux-kernel - Re: linux-next: build failure after merge of the drm-misc tree

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Date: Tue, 20 Feb 2024 08:48:21 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>, Christian König
 <christian.koenig@....com>, Somalapuram Amaranath
 <Amaranath.Somalapuram@....com>, Intel Graphics
 <intel-gfx@...ts.freedesktop.org>, DRI <dri-devel@...ts.freedesktop.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Next
 Mailing List <linux-next@...r.kernel.org>, zack.rusin@...adcom.com,
 tzimmermann@...e.de, thomas.hellstrom@...ux.intel.com, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin
 <tvrtko.ursulin@...ux.intel.com>
Subject: Re: linux-next: build failure after merge of the drm-misc tree

Hi all,

On Mon, 12 Feb 2024 15:15:54 +0200 Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>
> On Tue, 06 Feb 2024, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > 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@...b.auug.org.au>
> > Date: Tue, 6 Feb 2024 15:17:54 +1100
> > Subject: [PATCH] drm/ttm: initialise places
> >
> > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > ---
> >  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  

I am still applying the above patch ...

-- 
Cheers,
Stephen Rothwell

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