linux-kernel - [PATCH 5.18 093/102] drm/fourcc: fix integer type usage in uapi header

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Date:   Tue,  5 Jul 2022 13:58:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Carlos Llamas <cmllamas@...gle.com>,
        Simon Ser <contact@...rsion.fr>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 093/102] drm/fourcc: fix integer type usage in uapi header

From: Carlos Llamas <cmllamas@...gle.com>

[ Upstream commit 20b8264394b33adb1640a485a62a84bc1388b6a3 ]

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 = AMD_FMT_MOD_CLEAR(RB);
  	return 0;
  }

gcc error:
  drm.c:5:27: error: ‘uint64_t’ undeclared (first use in this function)
      5 |         unsigned long x = 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@...gle.com>
Reviewed-by: Simon Ser <contact@...rsion.fr>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 fc0c1454d275..7b9e3f9a0f00 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -1375,11 +1375,11 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
 #define AMD_FMT_MOD_PIPE_MASK 0x7
 
 #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))
 
 #if defined(__cplusplus)
 }
-- 
2.35.1