Merge tag 'disintegrate-main-20121013' of git://git.infradead.org/users/dhowells/linux-headers

Pull UAPI disintegration for include/linux/{,byteorder/}*.h from David Howells:
 "The patches contained herein do the following:

 (1) Remove kernel-only stuff in linux/ppp-comp.h from the UAPI.  I checked
     this with Paul Mackerras before I created the patch and he suggested some
     extra bits to unexport.

 (2) Remove linux/blk_types.h entirely from the UAPI as none of it is userspace
     applicable, and remove from the UAPI that part of linux/fs.h that was the
     reason for linux/blk_types.h being exported in the first place.  I
     discussed this with Jens Axboe before creating the patch.

 (3) The big patch of the series to disintegrate include/linux/*.h as a unit.
     This could be split up, though there would be collisions in moving stuff
     between the two Kbuild files when the parts are merged as that file is
     sorted alphabetically rather than being grouped by subsystem.

     Of this set of headers, 17 files have changed in the UAPI exported region
     since the 4th and only 8 since the 9th so there isn't much change in this
     area - as one might expect.

     It should be pretty obvious and straightforward if it does come to fixing
     up: stuff in __KERNEL__ guards stays where it is and stuff outside moves
     to the same file in the include/uapi/linux/ directory.

     If a new file appears then things get a bit more complicated as the
     "headers +=" line has to move to include/uapi/linux/Kbuild.  Only one new
     file has appeared since the 9th and I judge this type of event relatively
     unlikely.

 (4) A patch to disintegrate include/linux/byteorder/*.h as a unit.

  Signed-off-by: David Howells <dhowells@redhat.com>"

* tag 'disintegrate-main-20121013' of git://git.infradead.org/users/dhowells/linux-headers:
  UAPI: (Scripted) Disintegrate include/linux/byteorder
  UAPI: (Scripted) Disintegrate include/linux
  UAPI: Unexport linux/blk_types.h
  UAPI: Unexport part of linux/ppp-comp.h

1 files changed, 282 insertions, 0 deletions

diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
new file mode 100644
index 000000000000..e811474724c2
--- /dev/null
+++ b/include/uapi/linux/swab.h
@@ -0,0 +1,282 @@
+#ifndef _UAPI_LINUX_SWAB_H
+#define _UAPI_LINUX_SWAB_H
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <asm/swab.h>
+
+/*
+ * casts are necessary for constants, because we never know how for sure
+ * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
+ */
+#define ___constant_swab16(x) ((__u16)(				\
+	(((__u16)(x) & (__u16)0x00ffU) << 8) |			\
+	(((__u16)(x) & (__u16)0xff00U) >> 8)))
+
+#define ___constant_swab32(x) ((__u32)(				\
+	(((__u32)(x) & (__u32)0x000000ffUL) << 24) |		\
+	(((__u32)(x) & (__u32)0x0000ff00UL) <<  8) |		\
+	(((__u32)(x) & (__u32)0x00ff0000UL) >>  8) |		\
+	(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
+
+#define ___constant_swab64(x) ((__u64)(				\
+	(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) |	\
+	(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) |	\
+	(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) |	\
+	(((__u64)(x) & (__u64)0x00000000ff000000ULL) <<  8) |	\
+	(((__u64)(x) & (__u64)0x000000ff00000000ULL) >>  8) |	\
+	(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) |	\
+	(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) |	\
+	(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
+
+#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)))
+
+/*
+ * Implement the following as inlines, but define the interface using
+ * macros to allow constant folding when possible:
+ * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32
+ */
+
+static inline __attribute_const__ __u16 __fswab16(__u16 val)
+{
+#ifdef __arch_swab16
+	return __arch_swab16(val);
+#else
+	return ___constant_swab16(val);
+#endif
+}
+
+static inline __attribute_const__ __u32 __fswab32(__u32 val)
+{
+#ifdef __arch_swab32
+	return __arch_swab32(val);
+#else
+	return ___constant_swab32(val);
+#endif
+}
+
+static inline __attribute_const__ __u64 __fswab64(__u64 val)
+{
+#ifdef __arch_swab64
+	return __arch_swab64(val);
+#elif defined(__SWAB_64_THRU_32__)
+	__u32 h = val >> 32;
+	__u32 l = val & ((1ULL << 32) - 1);
+	return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h)));
+#else
+	return ___constant_swab64(val);
+#endif
+}
+
+static inline __attribute_const__ __u32 __fswahw32(__u32 val)
+{
+#ifdef __arch_swahw32
+	return __arch_swahw32(val);
+#else
+	return ___constant_swahw32(val);
+#endif
+}
+
+static inline __attribute_const__ __u32 __fswahb32(__u32 val)
+{
+#ifdef __arch_swahb32
+	return __arch_swahb32(val);
+#else
+	return ___constant_swahb32(val);
+#endif
+}
+
+/**
+ * __swab16 - return a byteswapped 16-bit value
+ * @x: value to byteswap
+ */
+#define __swab16(x)				\
+	(__builtin_constant_p((__u16)(x)) ?	\
+	___constant_swab16(x) :			\
+	__fswab16(x))
+
+/**
+ * __swab32 - return a byteswapped 32-bit value
+ * @x: value to byteswap
+ */
+#define __swab32(x)				\
+	(__builtin_constant_p((__u32)(x)) ?	\
+	___constant_swab32(x) :			\
+	__fswab32(x))
+
+/**
+ * __swab64 - return a byteswapped 64-bit value
+ * @x: value to byteswap
+ */
+#define __swab64(x)				\
+	(__builtin_constant_p((__u64)(x)) ?	\
+	___constant_swab64(x) :			\
+	__fswab64(x))
+
+/**
+ * __swahw32 - return a word-swapped 32-bit value
+ * @x: value to wordswap
+ *
+ * __swahw32(0x12340000) is 0x00001234
+ */
+#define __swahw32(x)				\
+	(__builtin_constant_p((__u32)(x)) ?	\
+	___constant_swahw32(x) :		\
+	__fswahw32(x))
+
+/**
+ * __swahb32 - return a high and low byte-swapped 32-bit value
+ * @x: value to byteswap
+ *
+ * __swahb32(0x12345678) is 0x34127856
+ */
+#define __swahb32(x)				\
+	(__builtin_constant_p((__u32)(x)) ?	\
+	___constant_swahb32(x) :		\
+	__fswahb32(x))
+
+/**
+ * __swab16p - return a byteswapped 16-bit value from a pointer
+ * @p: pointer to a naturally-aligned 16-bit value
+ */
+static inline __u16 __swab16p(const __u16 *p)
+{
+#ifdef __arch_swab16p
+	return __arch_swab16p(p);
+#else
+	return __swab16(*p);
+#endif
+}
+
+/**
+ * __swab32p - return a byteswapped 32-bit value from a pointer
+ * @p: pointer to a naturally-aligned 32-bit value
+ */
+static inline __u32 __swab32p(const __u32 *p)
+{
+#ifdef __arch_swab32p
+	return __arch_swab32p(p);
+#else
+	return __swab32(*p);
+#endif
+}
+
+/**
+ * __swab64p - return a byteswapped 64-bit value from a pointer
+ * @p: pointer to a naturally-aligned 64-bit value
+ */
+static inline __u64 __swab64p(const __u64 *p)
+{
+#ifdef __arch_swab64p
+	return __arch_swab64p(p);
+#else
+	return __swab64(*p);
+#endif
+}
+
+/**
+ * __swahw32p - return a wordswapped 32-bit value from a pointer
+ * @p: pointer to a naturally-aligned 32-bit value
+ *
+ * See __swahw32() for details of wordswapping.
+ */
+static inline __u32 __swahw32p(const __u32 *p)
+{
+#ifdef __arch_swahw32p
+	return __arch_swahw32p(p);
+#else
+	return __swahw32(*p);
+#endif
+}
+
+/**
+ * __swahb32p - return a high and low byteswapped 32-bit value from a pointer
+ * @p: pointer to a naturally-aligned 32-bit value
+ *
+ * See __swahb32() for details of high/low byteswapping.
+ */
+static inline __u32 __swahb32p(const __u32 *p)
+{
+#ifdef __arch_swahb32p
+	return __arch_swahb32p(p);
+#else
+	return __swahb32(*p);
+#endif
+}
+
+/**
+ * __swab16s - byteswap a 16-bit value in-place
+ * @p: pointer to a naturally-aligned 16-bit value
+ */
+static inline void __swab16s(__u16 *p)
+{
+#ifdef __arch_swab16s
+	__arch_swab16s(p);
+#else
+	*p = __swab16p(p);
+#endif
+}
+/**
+ * __swab32s - byteswap a 32-bit value in-place
+ * @p: pointer to a naturally-aligned 32-bit value
+ */
+static inline void __swab32s(__u32 *p)
+{
+#ifdef __arch_swab32s
+	__arch_swab32s(p);
+#else
+	*p = __swab32p(p);
+#endif
+}
+
+/**
+ * __swab64s - byteswap a 64-bit value in-place
+ * @p: pointer to a naturally-aligned 64-bit value
+ */
+static inline void __swab64s(__u64 *p)
+{
+#ifdef __arch_swab64s
+	__arch_swab64s(p);
+#else
+	*p = __swab64p(p);
+#endif
+}
+
+/**
+ * __swahw32s - wordswap a 32-bit value in-place
+ * @p: pointer to a naturally-aligned 32-bit value
+ *
+ * See __swahw32() for details of wordswapping
+ */
+static inline void __swahw32s(__u32 *p)
+{
+#ifdef __arch_swahw32s
+	__arch_swahw32s(p);
+#else
+	*p = __swahw32p(p);
+#endif
+}
+
+/**
+ * __swahb32s - high and low byteswap a 32-bit value in-place
+ * @p: pointer to a naturally-aligned 32-bit value
+ *
+ * See __swahb32() for details of high and low byte swapping
+ */
+static inline void __swahb32s(__u32 *p)
+{
+#ifdef __arch_swahb32s
+	__arch_swahb32s(p);
+#else
+	*p = __swahb32p(p);
+#endif
+}
+
+
+#endif /* _UAPI_LINUX_SWAB_H */