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    SubjectRe: out-of-line x86 "put_user()" implementation
    On Mon, Feb 07, 2005 at 05:20:06PM -0800, Linus Torvalds wrote:
    > +#define __put_user_8(x, ptr) __asm__ __volatile__("call __put_user_8":"=A" (__ret_pu):"0" ((typeof(*(ptr)))(x)), "c" (ptr))

    This is not constrained enough. The compiler could choose to put the
    return value in edx. You want

    __asm__ __volatile__("call __put_user_8":"=a" (__ret_pu)
    : "A" ((typeof(*(ptr)))(x)), "c" (ptr))

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