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    Subject[RFC PATCH v1 06/31] asm-generic headers: Allow yet more arch overrides in checksum.h
    Date
    arches can have more efficient implementation of these routines

    Acked-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
    ---
    include/asm-generic/checksum.h | 4 ++++
    lib/checksum.c | 2 ++
    2 files changed, 6 insertions(+), 0 deletions(-)

    diff --git a/include/asm-generic/checksum.h b/include/asm-generic/checksum.h
    index c084767..59811df 100644
    --- a/include/asm-generic/checksum.h
    +++ b/include/asm-generic/checksum.h
    @@ -38,12 +38,15 @@ extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
    csum_partial_copy((src), (dst), (len), (sum))
    #endif

    +#ifndef ip_fast_csum
    /*
    * This is a version of ip_compute_csum() optimized for IP headers,
    * which always checksum on 4 octet boundaries.
    */
    extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
    +#endif

    +#ifndef csum_fold
    /*
    * Fold a partial checksum
    */
    @@ -54,6 +57,7 @@ static inline __sum16 csum_fold(__wsum csum)
    sum = (sum & 0xffff) + (sum >> 16);
    return (__force __sum16)~sum;
    }
    +#endif

    #ifndef csum_tcpudp_nofold
    /*
    diff --git a/lib/checksum.c b/lib/checksum.c
    index 12dceb2..129775e 100644
    --- a/lib/checksum.c
    +++ b/lib/checksum.c
    @@ -102,6 +102,7 @@ out:
    }
    #endif

    +#ifndef ip_fast_csum
    /*
    * This is a version of ip_compute_csum() optimized for IP headers,
    * which always checksum on 4 octet boundaries.
    @@ -111,6 +112,7 @@ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
    return (__force __sum16)~do_csum(iph, ihl*4);
    }
    EXPORT_SYMBOL(ip_fast_csum);
    +#endif

    /*
    * computes the checksum of a memory block at buff, length len,
    --
    1.7.4.1


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