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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6ac158fa-9333-492f-af24-4e6f6425eb96@mailbox.org>
Date: Tue, 1 Jul 2025 19:19:56 +0200
From: Michel Dänzer <michel.daenzer@...lbox.org>
To: José Expósito <jose.exposito89@...il.com>
Cc: maarten.lankhorst@...ux.intel.com, 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 01.07.25 18:45, José Expósito wrote:
> Hey Michel,
> 
> Thanks for looking into this.
> 
> On Tue, Jul 01, 2025 at 10:22:13AM +0200, Michel Dänzer wrote:
>> 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)
> 
> Yes, however, the same pattern is repeated 10 times in this file.
> 
> What do you think about fixing it in a follow up? I don't think it
> should block fixing the KUnit tests.

Ah, yes, makes sense to do it separately then.


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