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    Subject[PATCH v5 08/27] arm: introduce little-endian bitops
    Date
    Introduce little-endian bit operations by renaming native ext2 bit
    operations. The ext2 and minix bit operations are kept as wrapper
    macros using little-endian bit operations to maintain bisectability
    until the conversions are finished.

    Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
    Cc: Russell King <rmk+kernel@arm.linux.org.uk>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---

    Change from v4:
    - add casts in the macro to take any pointer types
    - drop acked-by line because enough changes has been made

    The whole series is available in the git branch at:
    git://git.kernel.org/pub/scm/linux/kernel/git/mita/linux-2.6.git le-bitops-v5

    arch/arm/include/asm/bitops.h | 61 +++++++++++++++++++++++-----------------
    1 files changed, 35 insertions(+), 26 deletions(-)

    diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
    index 7b1bb2b..872d502 100644
    --- a/arch/arm/include/asm/bitops.h
    +++ b/arch/arm/include/asm/bitops.h
    @@ -303,41 +303,50 @@ static inline int fls(int x)
    #include <asm-generic/bitops/hweight.h>
    #include <asm-generic/bitops/lock.h>

    +#define __set_bit_le(nr, p) \
    + __set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define __clear_bit_le(nr, p) \
    + __clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define __test_and_set_bit_le(nr, p) \
    + __test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define test_and_set_bit_le(nr, p) \
    + test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define __test_and_clear_bit_le(nr, p) \
    + __test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define test_and_clear_bit_le(nr, p) \
    + test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define test_bit_le(nr, p) \
    + test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    +#define find_first_zero_bit_le(p, sz) \
    + _find_first_zero_bit_le(p, sz)
    +#define find_next_zero_bit_le(p, sz, off) \
    + _find_next_zero_bit_le(p, sz, off)
    +#define find_next_bit_le(p, sz, off) \
    + _find_next_bit_le((unsigned long *)(p), sz, off)
    /*
    * Ext2 is defined to use little-endian byte ordering.
    * These do not need to be atomic.
    */
    -#define ext2_set_bit(nr,p) \
    - __test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define ext2_set_bit_atomic(lock,nr,p) \
    - test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define ext2_clear_bit(nr,p) \
    - __test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define ext2_clear_bit_atomic(lock,nr,p) \
    - test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define ext2_test_bit(nr,p) \
    - test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define ext2_find_first_zero_bit(p,sz) \
    - _find_first_zero_bit_le(p,sz)
    -#define ext2_find_next_zero_bit(p,sz,off) \
    - _find_next_zero_bit_le(p,sz,off)
    -#define ext2_find_next_bit(p, sz, off) \
    - _find_next_bit_le(p, sz, off)
    +#define ext2_set_bit __test_and_set_bit_le
    +#define ext2_set_bit_atomic(lock, nr, p) \
    + test_and_set_bit_le(nr, p)
    +#define ext2_clear_bit __test_and_clear_bit_le
    +#define ext2_clear_bit_atomic(lock, nr, p) \
    + test_and_clear_bit_le(nr, p)
    +#define ext2_test_bit test_bit_le
    +#define ext2_find_first_zero_bit find_first_zero_bit_le
    +#define ext2_find_next_zero_bit find_next_zero_bit_le
    +#define ext2_find_next_bit find_next_bit_le

    /*
    * Minix is defined to use little-endian byte ordering.
    * These do not need to be atomic.
    */
    -#define minix_set_bit(nr,p) \
    - __set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define minix_test_bit(nr,p) \
    - test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define minix_test_and_set_bit(nr,p) \
    - __test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define minix_test_and_clear_bit(nr,p) \
    - __test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
    -#define minix_find_first_zero_bit(p,sz) \
    - _find_first_zero_bit_le(p,sz)
    +#define minix_set_bit __set_bit_le
    +#define minix_test_bit test_bit_le
    +#define minix_test_and_set_bit __test_and_set_bit_le
    +#define minix_test_and_clear_bit __test_and_clear_bit_le
    +#define minix_find_first_zero_bit find_first_zero_bit_le

    #endif /* __KERNEL__ */

    --
    1.7.3.4


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