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Message-ID: <20230815-void-drivers-mtd-maps-physmap-versatile-v1-1-ba6fc86d5e4e@google.com>
Date: Tue, 15 Aug 2023 21:11:12 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org,
linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] mtd: maps: fix -Wvoid-pointer-to-enum-cast warning
When building with clang 18 I see the following warning:
| drivers/mtd/maps/physmap-versatile.c:209:25: warning: cast to smaller
| integer type 'enum versatile_flashprot' from 'const void *' [-Wvoid-pointer-to-enum-cast]
| 209 | versatile_flashprot = (enum versatile_flashprot)devid->data;
This is due to the fact that `devid->data` is a void* while `enum
versatile_flashprot` has the size of an int. This leads to truncation
and possible data loss.
Link: https://github.com/ClangBuiltLinux/linux/issues/1910
Reported-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Note: There is likely no data loss occurring here due to the fact that
`enum versatile_flashprot` has only a few enumerated fields, none of
which are large enough to cause data loss. Nonetheless, this patch helps
towards the goal of eventually enabling this warning for more builds.
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
drivers/mtd/maps/physmap-versatile.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/maps/physmap-versatile.c b/drivers/mtd/maps/physmap-versatile.c
index a1b8b7b25f88..d65cf8833771 100644
--- a/drivers/mtd/maps/physmap-versatile.c
+++ b/drivers/mtd/maps/physmap-versatile.c
@@ -206,7 +206,7 @@ int of_flash_probe_versatile(struct platform_device *pdev,
if (!sysnp)
return -ENODEV;
- versatile_flashprot = (enum versatile_flashprot)devid->data;
+ versatile_flashprot = (uintptr_t)devid->data;
rmap = syscon_node_to_regmap(sysnp);
of_node_put(sysnp);
if (IS_ERR(rmap))
---
base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421
change-id: 20230815-void-drivers-mtd-maps-physmap-versatile-2270fe7fdf16
Best regards,
--
Justin Stitt <justinstitt@...gle.com>
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