[PATCH] swab: fix sparse warnings

[Stephen Hemminger <stephen@networkplumber.org>]

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 <stephen@networkplumber.org>

--- 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);