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From: Justin Stitt <jstitt007@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
	Justin Stitt <jstitt007@gmail.com>
Subject: [PATCH] include/uapi/linux/swab.h: add __u16 cast to __swab16 conditional
Date: Tue,  7 Jun 2022 15:20:06 -0700	[thread overview]
Message-ID: <20220607222006.22719-1-jstitt007@gmail.com> (raw)

if __HAVE_BUILTIN_BSWAP16__ is defined then __swab16 utilizes a __u16 cast.
This same cast should be used if __HAVE_BUILTIN_BSWAP16__ is not defined as
well. This should fix loads (at least a few) clang -Wformat warnings
specifically with `ntohs()`

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Signed-off-by: Justin Stitt <jstitt007@gmail.com>
---
 include/uapi/linux/swab.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
index 7272f85d6d6a..f6be3f2e6fee 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -102,7 +102,7 @@ static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
 #else
 #define __swab16(x)				\
-	(__builtin_constant_p((__u16)(x)) ?	\
+	(__u16)(__builtin_constant_p((__u16)(x)) ?	\
 	___constant_swab16(x) :			\
 	__fswab16(x))
 #endif
-- 
2.30.2


             reply	other threads:[~2022-06-07 22:20 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-07 22:20 Justin Stitt [this message]
2022-06-07 22:27 ` [PATCH] include/uapi/linux/swab.h: add __u16 cast to __swab16 conditional Andrew Morton
2022-06-07 22:42   ` Nick Desaulniers
2022-06-07 23:21     ` Andrew Morton
2022-06-07 23:43       ` Nick Desaulniers
2022-06-08  4:54       ` Al Viro
2022-06-08 19:35         ` Nick Desaulniers
2022-06-10  7:19           ` David Laight
2022-06-07 23:20 ` Nick Desaulniers
2022-06-08  0:14   ` [PATCH v2] include/uapi/linux/swab.h: move explicit cast outside ternary Justin Stitt
2022-06-08 20:09     ` Andrew Morton
2022-06-08 21:16       ` Nick Desaulniers
2022-06-08 21:19     ` Nick Desaulniers

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