linux-kernel - Re: [PATCH 1/2] drm/tests: Fix endian warning

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Message-ID: <6c2e44cc-c01a-4331-b139-152ccdbd0401@mailbox.org>
Date: Tue, 1 Jul 2025 10:22:13 +0200
From: Michel Dänzer <michel.daenzer@...lbox.org>
To: José Expósito <jose.exposito89@...il.com>,
 maarten.lankhorst@...ux.intel.com
Cc: mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
 simona@...ll.ch, lumag@...nel.org, cristian.ciocaltea@...labora.com,
 gcarlos@...root.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/tests: Fix endian warning

On 30.06.25 11:00, José Expósito wrote:
> When compiling with sparse enabled, this warning is thrown:
> 
>   warning: incorrect type in argument 2 (different base types)
>      expected restricted __le32 const [usertype] *buf
>      got unsigned int [usertype] *[assigned] buf
> 
> Add a cast to fix it.
> 
> Fixes: 453114319699 ("drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_xrgb2101010()")
> Signed-off-by: José Expósito <jose.exposito89@...il.com>
> ---
>  drivers/gpu/drm/tests/drm_format_helper_test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index 7299fa8971ce..86829e1cb7f0 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -1033,7 +1033,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
>  		NULL : &result->dst_pitch;
>  
>  	drm_fb_xrgb8888_to_xrgb2101010(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
> -	buf = le32buf_to_cpu(test, buf, dst_size / sizeof(u32));
> +	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
>  	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
>  
>  	buf = dst.vaddr; /* restore original value of buf */

It might be cleaner to use two separate variables instead of using "buf" as both little endian and host byte order. (Same for patch 2)


-- 
Earthling Michel Dänzer       \        GNOME / Xwayland / Mesa developer
https://redhat.com             \               Libre software enthusiast