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    Subject[RFC PATCH 1/6] kenrel.h: add ALIGN_OF_LAST_BIT()
    Date
    Get the biggest 2**y that x % (2**y) == 0 for the align value. 

    Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
    ---
    include/linux/kernel.h | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/include/linux/kernel.h b/include/linux/kernel.h
    index 5113462..2c439dc 100644
    --- a/include/linux/kernel.h
    +++ b/include/linux/kernel.h
    @@ -44,6 +44,8 @@
    #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
    #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)

    +#define ALIGN_OF_LAST_BIT(x) ((((x)^((x) - 1))>>1) + 1)
    +
    #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

    /*
    --
    1.7.4.4


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