The patch titled
bitops: use find_first_zero_bit() instead of find_next_zero_bit(addr, size, 0)
has been removed from the -mm tree. Its filename was
bitops-use-find_first_zero_bit-instead-of-find_next_zero_bitaddr-size-0.patch
This patch was dropped because an updated version will be merged
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: bitops: use find_first_zero_bit() instead of find_next_zero_bit(addr, size, 0)
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
The little-endian bitops patch series introduced inefficiency to some
little-endian architectures.
include/asm-generic/bitops/le.h defines find_first_zero_le_bit() like this:
#define find_first_zero_le_bit(addr, size) \
find_next_zero_le_bit((addr), (size), 0)
All little-endian architectures include le.h and little-endian bitops
are just aliases for their native endian bitops. So above macro definision
is converted to:
#define find_first_zero_le_bit(addr, size) \
find_next_zero_bit(addr, size, 0)
This is inefficient for some architectures which have faster
find_first_zero_bit() than find_next_zero_bit(addr, size, 0).
Fix it by aliasing find_first_zero_bit() to find_first_zero_le_bit()
on little-endian architectures.
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/bitops/le.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff -puN include/asm-generic/bitops/le.h~bitops-use-find_first_zero_bit-instead-of-find_next_zero_bitaddr-size-0 include/asm-generic/bitops/le.h
--- a/include/asm-generic/bitops/le.h~bitops-use-find_first_zero_bit-instead-of-find_next_zero_bitaddr-size-0
+++ a/include/asm-generic/bitops/le.h
@@ -12,6 +12,8 @@
find_next_zero_bit(addr, size, offset)
#define find_next_le_bit(addr, size, offset) \
find_next_bit(addr, size, offset)
+#define find_first_zero_le_bit(addr, size) \
+ find_first_zero_bit(addr, size)
#elif defined(__BIG_ENDIAN)
@@ -22,6 +24,9 @@ extern unsigned long find_next_zero_le_b
extern unsigned long find_next_le_bit(const unsigned long *addr,
unsigned long size, unsigned long offset);
+#define find_first_zero_le_bit(addr, size) \
+ find_next_zero_le_bit((addr), (size), 0)
+
#else
#error "Please fix <asm/byteorder.h>"
#endif
@@ -43,7 +48,4 @@ extern unsigned long find_next_le_bit(co
#define __test_and_clear_le_bit(nr, addr) \
__test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
-#define find_first_zero_le_bit(addr, size) \
- find_next_zero_le_bit((addr), (size), 0)
-
#endif /* _ASM_GENERIC_BITOPS_LE_H_ */
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
origin.patch
spufs-use-simple_write_to_buffer.patch
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