linux-kernel - Re: [PATCH] [v2] nouveau: fix function cast warning

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Date: Fri, 5 Apr 2024 18:37:57 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Ben Skeggs <bskeggs@...hat.com>, dri-devel@...ts.freedesktop.org,
 nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev, Karol Herbst <kherbst@...hat.com>,
 Lyude Paul <lyude@...hat.com>
Subject: Re: [PATCH] [v2] nouveau: fix function cast warning

On 4/4/24 18:02, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Calling a function through an incompatible pointer type causes breaks
> kcfi, so clang warns about the assignment:
> 
> drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c:73:10: error: cast from 'void (*)(const void *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>     73 |         .fini = (void(*)(void *))kfree,
> 
> Avoid this with a trivial wrapper.
> 
> Fixes: c39f472e9f14 ("drm/nouveau: remove symlinks, move core/ to nvkm/ (no code changes)")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied to drm-misc-fixes, thanks!

> ---
> v2: avoid 'return kfree()' expression returning a void
> ---
>   drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
> index 4bf486b57101..cb05f7f48a98 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
> @@ -66,11 +66,16 @@ of_init(struct nvkm_bios *bios, const char *name)
>   	return ERR_PTR(-EINVAL);
>   }
>   
> +static void of_fini(void *p)
> +{
> +	kfree(p);
> +}
> +
>   const struct nvbios_source
>   nvbios_of = {
>   	.name = "OpenFirmware",
>   	.init = of_init,
> -	.fini = (void(*)(void *))kfree,
> +	.fini = of_fini,
>   	.read = of_read,
>   	.size = of_size,
>   	.rw = false,