byteorder: only use linux/swab.h

The first step to make swab.h a regular header that will
include an asm/swab.h with arch overrides.

Avoid the gratuitous differences introduced in the new
linux/swab.h by naming the ___constant_swabXX bits and
__fswabXX bits exactly as found in the old implementation
in byteorder/swab[b].h

Use this new swab.h in byteorder/[big|little]_endian.h and
remove the two old swab headers.

Although the inclusion of asm/byteorder.h looks strange in
linux/swab.h, this will allow each arch to move the actual
arch overrides for the swab bits in an asm file and then
the includes can be cleaned up without requiring a flag day
for all arches at once.

Keep providing __fswabXX in case some userspace was using them
directly, but the revised __swabXX should be used instead in
any new code and will always do constant folding not dependent
on the optimization level, which means the __constant versions
can be phased out in-kernel.

Arches that use the old-style arch macros will lose their
optimized versions until they move to the new style, but at
least they will still compile.  Many arches have already moved
and the patches to move the remaining arches are trivial.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 135 deletions

diff --git a/include/linux/byteorder/swabb.h b/include/linux/byteorder/swabb.h
deleted file mode 100644
index 8c780c7d779..00000000000
--- a/include/linux/byteorder/swabb.h
+++ /dev/null
@@ -1,135 +0,0 @@
-#ifndef _LINUX_BYTEORDER_SWABB_H
-#define _LINUX_BYTEORDER_SWABB_H
-
-/*
- * linux/byteorder/swabb.h
- * SWAp Bytes Bizarrely
- *	swaHHXX[ps]?(foo)
- *
- * Support for obNUXIous pdp-endian and other bizarre architectures.
- * Will Linux ever run on such ancient beasts? if not, this file
- * will be but a programming pearl. Still, it's a reminder that we
- * shouldn't be making too many assumptions when trying to be portable.
- *
- */
-
-/*
- * Meaning of the names I chose (vaxlinux people feel free to correct them):
- * swahw32	swap 16-bit half-words in a 32-bit word
- * swahb32	swap 8-bit halves of each 16-bit half-word in a 32-bit word
- *
- * No 64-bit support yet. I don't know NUXI conventions for long longs.
- * I guarantee it will be a mess when it's there, though :->
- * It will be even worse if there are conflicting 64-bit conventions.
- * Hopefully, no one ever used 64-bit objects on NUXI machines.
- *
- */
-
-#include <linux/types.h>
-
-#define ___swahw32(x) \
-({ \
-	__u32 __x = (x); \
-	((__u32)( \
-		(((__u32)(__x) & (__u32)0x0000ffffUL) << 16) | \
-		(((__u32)(__x) & (__u32)0xffff0000UL) >> 16) )); \
-})
-#define ___swahb32(x) \
-({ \
-	__u32 __x = (x); \
-	((__u32)( \
-		(((__u32)(__x) & (__u32)0x00ff00ffUL) << 8) | \
-		(((__u32)(__x) & (__u32)0xff00ff00UL) >> 8) )); \
-})
-
-#define ___constant_swahw32(x) \
-	((__u32)( \
-		(((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
-		(((__u32)(x) & (__u32)0xffff0000UL) >> 16) ))
-#define ___constant_swahb32(x) \
-	((__u32)( \
-		(((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
-		(((__u32)(x) & (__u32)0xff00ff00UL) >> 8) ))
-
-/*
- * provide defaults when no architecture-specific optimization is detected
- */
-#ifndef __arch__swahw32
-#  define __arch__swahw32(x) ___swahw32(x)
-#endif
-#ifndef __arch__swahb32
-#  define __arch__swahb32(x) ___swahb32(x)
-#endif
-
-#ifndef __arch__swahw32p
-#  define __arch__swahw32p(x) __swahw32(*(x))
-#endif
-#ifndef __arch__swahb32p
-#  define __arch__swahb32p(x) __swahb32(*(x))
-#endif
-
-#ifndef __arch__swahw32s
-#  define __arch__swahw32s(x) do { *(x) = __swahw32p((x)); } while (0)
-#endif
-#ifndef __arch__swahb32s
-#  define __arch__swahb32s(x) do { *(x) = __swahb32p((x)); } while (0)
-#endif
-
-
-/*
- * Allow constant folding
- */
-#define __swahw32(x) \
-(__builtin_constant_p((__u32)(x)) ? \
- ___swahw32((x)) : \
- __fswahw32((x)))
-#define __swahb32(x) \
-(__builtin_constant_p((__u32)(x)) ? \
- ___swahb32((x)) : \
- __fswahb32((x)))
-
-
-static inline __u32 __fswahw32(__u32 x)
-{
-	return __arch__swahw32(x);
-}
-
-static inline __u32 __swahw32p(__u32 *x)
-{
-	return __arch__swahw32p(x);
-}
-
-static inline void __swahw32s(__u32 *addr)
-{
-	__arch__swahw32s(addr);
-}
-
-static inline __u32 __fswahb32(__u32 x)
-{
-	return __arch__swahb32(x);
-}
-
-static inline __u32 __swahb32p(__u32 *x)
-{
-	return __arch__swahb32p(x);
-}
-
-static inline void __swahb32s(__u32 *addr)
-{
-	__arch__swahb32s(addr);
-}
-
-#ifdef __BYTEORDER_HAS_U64__
-/*
- * Not supported yet
- */
-#endif /* __BYTEORDER_HAS_U64__ */
-
-#define swahw32 __swahw32
-#define swahb32 __swahb32
-#define swahw32p __swahw32p
-#define swahb32p __swahb32p
-#define swahw32s __swahw32s
-#define swahb32s __swahb32s
-
-#endif /* _LINUX_BYTEORDER_SWABB_H */