linux-kernel - [PATCH] drm/repaper: fix -Wvoid-pointer-to-enum-cast warning

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Message-ID: <20230816-void-drivers-gpu-drm-tiny-repaper-v1-1-9d8d10f0d52f@google.com>
Date:   Wed, 16 Aug 2023 19:55:29 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     "Noralf Trønnes" <noralf@...nnes.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] drm/repaper: fix -Wvoid-pointer-to-enum-cast warning

When building with clang 18 I see the following warning:
|       drivers/gpu/drm/tiny/repaper.c:952:11: warning: cast to smaller integer
|       type 'enum repaper_model' from 'const void *' [-Wvoid-pointer-to-enum-cast]
|         952 |                 model = (enum repaper_model)match;
|

This is due to the fact that `match` is a void* while `enum repaper_model`
has the size of an int.

Add uintptr_t cast to silence clang warning while also keeping enum cast
for readability and consistency with other `model` assignment just a
few lines below:
|       model = (enum repaper_model)spi_id->driver_data;

Link: https://github.com/ClangBuiltLinux/linux/issues/1910
Reported-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 drivers/gpu/drm/tiny/repaper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
index c2677d081a7b..165f2099e7d8 100644
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -949,7 +949,7 @@ static int repaper_probe(struct spi_device *spi)
 
 	match = device_get_match_data(dev);
 	if (match) {
-		model = (enum repaper_model)match;
+		model = (enum repaper_model)(uintptr_t)match;
 	} else {
 		spi_id = spi_get_device_id(spi);
 		model = (enum repaper_model)spi_id->driver_data;

---
base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421
change-id: 20230816-void-drivers-gpu-drm-tiny-repaper-a08321cd99d7

Best regards,
--
Justin Stitt <justinstitt@...gle.com>