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Subject[PATCH] swab: fix sparse warnings
There are a lot of sparse warnings in networking code where a constant
ends up being byte swapped caused because there is no explicit
prototype for the __builtin_bswap functions. Simplest workaround
is to just avoid them here, and use the normal swap routines when
doing sparse checks.

Signed-off-by: Stephen Hemminger <>

--- a/include/uapi/linux/swab.h 2013-05-11 15:58:53.844321915 -0700
+++ b/include/uapi/linux/swab.h 2013-07-30 14:49:22.066773449 -0700
@@ -45,7 +45,7 @@

static inline __attribute_const__ __u16 __fswab16(__u16 val)
-#ifdef __HAVE_BUILTIN_BSWAP16__
+#if defined(__HAVE_BUILTIN_BSWAP16__) && !defined(__CHECKER__)
return __builtin_bswap16(val);
#elif defined (__arch_swab16)
return __arch_swab16(val);
@@ -56,7 +56,7 @@ static inline __attribute_const__ __u16

static inline __attribute_const__ __u32 __fswab32(__u32 val)
-#ifdef __HAVE_BUILTIN_BSWAP32__
+#if defined(__HAVE_BUILTIN_BSWAP32__) && !defined(__CHECKER__)
return __builtin_bswap32(val);
#elif defined(__arch_swab32)
return __arch_swab32(val);
@@ -67,7 +67,7 @@ static inline __attribute_const__ __u32

static inline __attribute_const__ __u64 __fswab64(__u64 val)
-#ifdef __HAVE_BUILTIN_BSWAP64__
+#if defined(__HAVE_BUILTIN_BSWAP64__) && !defined(__CHECKER__)
return __builtin_bswap64(val);
#elif defined (__arch_swab64)
return __arch_swab64(val);

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