linux-kernel - Re: [PATCH] drm/i915/gt: Remove const from struct i915

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Message-ID: <874iy8y0nz.fsf@intel.com>
Date: Mon, 28 Apr 2025 14:40:16 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Kees Cook <kees@...nel.org>
Cc: Kees Cook <kees@...nel.org>, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Matt Roper <matthew.d.roper@...el.com>,
 Gustavo Sousa <gustavo.sousa@...el.com>, Andi Shyti
 <andi.shyti@...ux.intel.com>, Lucas De Marchi <lucas.demarchi@...el.com>,
 intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, Gnattu
 OC <gnattuoc@...com>, Nitin Gote <nitin.r.gote@...el.com>, Ranu Maurya
 <ranu.maurya@...el.com>, Ville Syrjälä
 <ville.syrjala@...ux.intel.com>,
 Angus Chen <angus.chen@...el.com>, Juha-Pekka Heikkila
 <juhapekka.heikkila@...il.com>, Yu Jiaoliang <yujiaoliang@...o.com>,
 Dnyaneshwar Bhadane <dnyaneshwar.bhadane@...el.com>,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] drm/i915/gt: Remove const from struct i915_wa list
 allocation

On Fri, 25 Apr 2025, Kees Cook <kees@...nel.org> wrote:
> In preparation for making the kmalloc family of allocators type aware,
> we need to make sure that the returned type from the allocation matches
> the type of the variable being assigned. (Before, the allocator would
> always return "void *", which can be implicitly cast to any pointer type.)
>
> The assigned type is "struct i915_wa *". The returned type, while
> technically matching, will be const qualified. As there is no general
> way to remove const qualifiers, adjust the allocation type to match
> the assignment.
>
> Signed-off-by: Kees Cook <kees@...nel.org>

Acked-by: Jani Nikula <jani.nikula@...el.com>

for merging via whichever tree you find best; please let us know if you
want us to pick this up via drm-intel.

> ---
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Tvrtko Ursulin <tursulin@...ulin.net>
> Cc: David Airlie <airlied@...il.com>
> Cc: Simona Vetter <simona@...ll.ch>
> Cc: Matt Roper <matthew.d.roper@...el.com>
> Cc: Gustavo Sousa <gustavo.sousa@...el.com>
> Cc: Andi Shyti <andi.shyti@...ux.intel.com>
> Cc: Lucas De Marchi <lucas.demarchi@...el.com>
> Cc: <intel-gfx@...ts.freedesktop.org>
> Cc: <dri-devel@...ts.freedesktop.org>
> ---
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 116683ebe074..b37e400f74e5 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -156,7 +156,7 @@ static void _wa_add(struct i915_wa_list *wal, const struct i915_wa *wa)
>  	if (IS_ALIGNED(wal->count, grow)) { /* Either uninitialized or full. */
>  		struct i915_wa *list;
>  
> -		list = kmalloc_array(ALIGN(wal->count + 1, grow), sizeof(*wa),
> +		list = kmalloc_array(ALIGN(wal->count + 1, grow), sizeof(*list),
>  				     GFP_KERNEL);
>  		if (!list) {
>  			drm_err(&i915->drm, "No space for workaround init!\n");

-- 
Jani Nikula, Intel