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    Subject[PATCH 03/10] x86: fix percpu_write with 64-bit constants
    Date
    From: Brian Gerst <brgerst@gmail.com>

    Impact: slightly better code generation for percpu_to_op()

    The processor will sign-extend 32-bit immediate values in 64-bit
    operations. Use the 'e' constraint ("32-bit signed integer constant,
    or a symbolic reference known to fit that range") for 64-bit constants.

    Signed-off-by: Brian Gerst <brgerst@gmail.com>
    Signed-off-by: Tejun Heo <tj@kernel.org>
    ---
    arch/x86/include/asm/percpu.h | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
    index ce980db..0b64af4 100644
    --- a/arch/x86/include/asm/percpu.h
    +++ b/arch/x86/include/asm/percpu.h
    @@ -75,7 +75,7 @@ do { \
    case 8: \
    asm(op "q %1,"__percpu_arg(0) \
    : "+m" (var) \
    - : "r" ((T__)val)); \
    + : "re" ((T__)val)); \
    break; \
    default: __bad_percpu_size(); \
    } \
    --
    1.6.0.2


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