The patch titled
Subject: uapi: rename ext2_swab() to swab() and share globally in swab.h
has been added to the -mm tree. Its filename is
uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh.patch
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------------------------------------------------------
From: Yury Norov <yury.norov@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
Cc: Allison Randal <allison@xxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swab.h | 1 +
include/uapi/linux/swab.h | 10 ++++++++++
lib/find_bit.c | 16 ++--------------
3 files changed, 13 insertions(+), 14 deletions(-)
--- a/include/linux/swab.h~uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh
+++ a/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
--- a/include/uapi/linux/swab.h~uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh
+++ a/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
__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
--- a/lib/find_bit.c~uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh
+++ a/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_b
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_b
tmp ^= invert;
}
- return min(start + __ffs(ext2_swab(tmp)), nbits);
+ return min(start + __ffs(swab(tmp)), nbits);
}
#endif
_
Patches currently in -mm which might be from yury.norov@xxxxxxxxx are
uapi-rename-ext2_swab-to-swab-and-share-globally-in-swabh.patch
lib-find_bitc-join-_find_next_bit_le.patch
lib-find_bitc-uninline-helper-_find_next_bit.patch
lib-string-add-strnchrnul.patch
bitops-more-bits_to_-macros.patch
lib-add-test-for-bitmap_parse.patch
lib-add-test-for-bitmap_parse-fix.patch
lib-make-bitmap_parse_user-a-wrapper-on-bitmap_parse.patch
lib-rework-bitmap_parse.patch
lib-new-testcases-for-bitmap_parse_user.patch
cpumask-dont-calculate-length-of-the-input-string.patch
