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uapi: rename ext2_swab() to swab() and share globally in swab.h 

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.

Link: http://lkml.kernel.org/r/20200103202846.21616-1-yury.norov@gmail.com
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Joe Perches <joe@perches.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yury Norov 2020-01-30 22:16:40 -08:00 committed by Linus Torvalds
parent 4e456fee21
commit d5767057c9
3 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/swab.h
View File

@ -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

10
include/uapi/linux/swab.h
View File

@ -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

16
lib/find_bit.c
View File

@ -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