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    SubjectRe: [PATCH 2/6] bitops: more BITS_TO_* macros
    On Sat, Apr 27, 2019 at 08:29:32PM -0700, Yury Norov wrote:
    > Introduce BITS_TO_U64, BITS_TO_U32 and BITS_TO_BYTES as they are handy
    > in the following changes (BITS_TO_U32 specifically). Sync tools/
    > version of the macros with the kernel implementation.

    AFAICS you basically reimplement them for kernel use from tools/.

    > #define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)

    Hmm... no TAB here? Perhaps another small fix can be done.

    > #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
    > +#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
    > +#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
    > +#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
    >
    > extern unsigned int __sw_hweight8(unsigned int w);
    > extern unsigned int __sw_hweight16(unsigned int w);
    > diff --git a/tools/include/linux/bitops.h b/tools/include/linux/bitops.h
    > index 0b0ef3abc966..959dcb8214ba 100644
    > --- a/tools/include/linux/bitops.h
    > +++ b/tools/include/linux/bitops.h
    > @@ -13,10 +13,11 @@
    > #include <linux/bits.h>
    > #include <linux/compiler.h>
    >
    > -#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
    > -#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
    > -#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
    > -#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE)
    > +#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
    > +#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
    > +#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
    > +#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
    > +#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char))

    --
    With Best Regards,
    Andy Shevchenko


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