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Date:   Tue, 21 Jun 2022 20:39:21 +0000
Message-Id: <20220621203921.3594920-1-cmllamas@google.com>
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Subject: [PATCH] drm/fourcc: fix integer type usage in uapi header
From:   Carlos Llamas <cmllamas@google.com>
To:     amd-gfx@lists.freedesktop.org
Cc:     Masahiro Yamada <masahiroy@kernel.org>,
        Carlos Llamas <cmllamas@google.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Alex Deucher <alexander.deucher@amd.com>,
        Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
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Kernel uapi headers are supposed to use __[us]{8,16,32,64} types defined
by <linux/types.h> as opposed to 'uint32_t' and similar. See [1] for the
relevant discussion about this topic. In this particular case, the usage
of 'uint64_t' escaped headers_check as these macros are not being called
here. However, the following program triggers a compilation error:

  #include <drm/drm_fourcc.h>

  int main()
  {
  	unsigned long x =3D AMD_FMT_MOD_CLEAR(RB);
  	return 0;
  }

gcc error:
  drm.c:5:27: error: =E2=80=98uint64_t=E2=80=99 undeclared (first use in th=
is function)
      5 |         unsigned long x =3D AMD_FMT_MOD_CLEAR(RB);
        |                           ^~~~~~~~~~~~~~~~~

This patch changes AMD_FMT_MOD_{SET,CLEAR} macros to use the correct
integer types, which fixes the above issue.

  [1] https://lkml.org/lkml/2019/6/5/18

Fixes: 8ba16d599374 ("drm/fourcc: Add AMD DRM modifiers.")
Signed-off-by: Carlos Llamas <cmllamas@google.com>
---
 include/uapi/drm/drm_fourcc.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index f1972154a594..0980678d502d 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -1444,11 +1444,11 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 mod=
ifier)
 #define AMD_FMT_MOD_PIPE_MASK 0x7
=20
 #define AMD_FMT_MOD_SET(field, value) \
-	((uint64_t)(value) << AMD_FMT_MOD_##field##_SHIFT)
+	((__u64)(value) << AMD_FMT_MOD_##field##_SHIFT)
 #define AMD_FMT_MOD_GET(field, value) \
 	(((value) >> AMD_FMT_MOD_##field##_SHIFT) & AMD_FMT_MOD_##field##_MASK)
 #define AMD_FMT_MOD_CLEAR(field) \
-	(~((uint64_t)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
+	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
=20
 #if defined(__cplusplus)
 }
--=20
2.37.0.rc0.104.g0611611a94-goog