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    Subject[PATCH 3.18 54/92] arch/powerpc: provide zero_bytemask() for big-endian
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Chris Metcalf <cmetcalf@ezchip.com>

    commit 7a5692e6e533fd379081ab06fb58f3f5ee4d80bc upstream.

    For some reason, only the little-endian flavor of
    powerpc provided the zero_bytemask() implementation.

    Reported-by: Michal Sojka <sojkam1@fel.cvut.cz>
    Acked-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/include/asm/word-at-a-time.h | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/arch/powerpc/include/asm/word-at-a-time.h
    +++ b/arch/powerpc/include/asm/word-at-a-time.h
    @@ -40,6 +40,11 @@ static inline bool has_zero(unsigned lon
    return (val + c->high_bits) & ~rhs;
    }

    +static inline unsigned long zero_bytemask(unsigned long mask)
    +{
    + return ~1ul << __fls(mask);
    +}
    +
    #else

    #ifdef CONFIG_64BIT

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