[PATCH 1/3] uapi: rename ext2_swab() to swab() and share globally in swab.h

[Yury Norov <yury.norov@gmail.com>]

ext2_swab() is defined locally in lib/find_bit.c However it is not specific
to ext2, neither to bitmaps.

There are many potential users of it, so rename it to just swab() and move
to include/uapi/linux/swab.h

ABI guarantees that size of unsigned long corresponds to BITS_PER_LONG,
therefore drop unneeded cast.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 include/linux/swab.h      |  1 +
 include/uapi/linux/swab.h | 10 ++++++++++
 lib/find_bit.c            | 16 ++--------------
 3 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/include/linux/swab.h b/include/linux/swab.h
index e466fd159c857..bcff5149861a9 100644
--- a/include/linux/swab.h
+++ b/include/linux/swab.h
@@ -7,6 +7,7 @@
 # define swab16 __swab16
 # define swab32 __swab32
 # define swab64 __swab64
+# define swab __swab
 # define swahw32 __swahw32
 # define swahb32 __swahb32
 # define swab16p __swab16p
diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
index 23cd84868cc3b..fa7f97da5b768 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -4,6 +4,7 @@
 
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <asm/bitsperlong.h>
 #include <asm/swab.h>
 
 /*
@@ -132,6 +133,15 @@ static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 	__fswab64(x))
 #endif
 
+static __always_inline unsigned long __swab(const unsigned long y)
+{
+#if BITS_PER_LONG == 64
+	return __swab64(y);
+#else /* BITS_PER_LONG == 32 */
+	return __swab32(y);
+#endif
+}
+
 /**
  * __swahw32 - return a word-swapped 32-bit value
  * @x: value to wordswap
diff --git a/lib/find_bit.c b/lib/find_bit.c
index e35a76b291e69..06e503c339f37 100644
--- a/lib/find_bit.c
+++ b/lib/find_bit.c
@@ -149,18 +149,6 @@ EXPORT_SYMBOL(find_last_bit);
 
 #ifdef __BIG_ENDIAN
 
-/* include/linux/byteorder does not support "unsigned long" type */
-static inline unsigned long ext2_swab(const unsigned long y)
-{
-#if BITS_PER_LONG == 64
-	return (unsigned long) __swab64((u64) y);
-#elif BITS_PER_LONG == 32
-	return (unsigned long) __swab32((u32) y);
-#else
-#error BITS_PER_LONG not defined
-#endif
-}
-
 #if !defined(find_next_bit_le) || !defined(find_next_zero_bit_le)
 static inline unsigned long _find_next_bit_le(const unsigned long *addr1,
 		const unsigned long *addr2, unsigned long nbits,
@@ -177,7 +165,7 @@ static inline unsigned long _find_next_bit_le(const unsigned long *addr1,
 	tmp ^= invert;
 
 	/* Handle 1st word. */
-	tmp &= ext2_swab(BITMAP_FIRST_WORD_MASK(start));
+	tmp &= swab(BITMAP_FIRST_WORD_MASK(start));
 	start = round_down(start, BITS_PER_LONG);
 
 	while (!tmp) {
@@ -191,7 +179,7 @@ static inline unsigned long _find_next_bit_le(const unsigned long *addr1,
 		tmp ^= invert;
 	}
 
-	return min(start + __ffs(ext2_swab(tmp)), nbits);
+	return min(start + __ffs(swab(tmp)), nbits);
 }
 #endif
 
-- 
2.20.1