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    Subject[14/18] [IA64] fix csum_ipv6_magic()
    2.6.27-stable review patch.  If anyone has any objections, please let us know.

    ------------------
    From: Jiri Bohac <jbohac@suse.cz>
    commit 5afe18d2f58812f3924edbd215464e5e3e8545e7 upstream.

    The 32-bit parameters (len and csum) of csum_ipv6_magic() are passed in 64-bit
    registers in2 and in4. The high order 32 bits of the registers were never
    cleared, and garbage was sometimes calculated into the checksum.

    Fix this by clearing the high order 32 bits of these registers.

    Signed-off-by: Jiri Bohac <jbohac@suse.cz>
    Signed-off-by: Tony Luck <tony.luck@intel.com>
    Cc: Dennis Schridde <devurandom@gmx.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    arch/ia64/lib/ip_fast_csum.S | 8 +++++---
    1 file changed, 5 insertions(+), 3 deletions(-)
    --- a/arch/ia64/lib/ip_fast_csum.S
    +++ b/arch/ia64/lib/ip_fast_csum.S
    @@ -96,20 +96,22 @@ END(ip_fast_csum)
    GLOBAL_ENTRY(csum_ipv6_magic)
    ld4 r20=[in0],4
    ld4 r21=[in1],4
    - dep r15=in3,in2,32,16
    + zxt4 in2=in2
    ;;
    ld4 r22=[in0],4
    ld4 r23=[in1],4
    - mux1 r15=r15,@rev
    + dep r15=in3,in2,32,16
    ;;
    ld4 r24=[in0],4
    ld4 r25=[in1],4
    - shr.u r15=r15,16
    + mux1 r15=r15,@rev
    add r16=r20,r21
    add r17=r22,r23
    + zxt4 in4=in4
    ;;
    ld4 r26=[in0],4
    ld4 r27=[in1],4
    + shr.u r15=r15,16
    add r18=r24,r25
    add r8=r16,r17
    ;;



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