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    SubjectRe: spin_lock forgets to clobber memory and other smp fixes [was
    kuznet@ms2.inr.ac.ru wrote:
    > Just hint. I remember the time when "memory" clobber option
    > was _absent_ in gcc. And we managed to compile kernel with such gcc. 8)
    > To all that I understand, "asm" (like function calls) implied barrier
    > that time and constraints and clobber option were used only for
    > register allocation and reloading.

    Well, now GCC does CSE across "asm" and will eliminate memory loads,
    even though it may not move them! I suspect it always did CSE across
    "asm" and we just never got hit by the bug.

    -- Jamie
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