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

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commit d5767057c9a76a29f073dad66b7fa12a90e8c748 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yury Norov 2020-01-30 22:16:40 -08:00 • committed by Greg Kroah-Hartman
commit 8b0f080366
3 changed files with 13 additions and 14 deletions
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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