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    SubjectRe: [PATCH]: x86_64: Remove unnecessary cast in prefetch()
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    Andi Kleen <andi@firstfloor.org> writes:

    ...
    >> to make kernel work with GCC 4.3 and above. (Also note that gcc 4.2 already
    >> smart enough to break that code, but kernel is just lucky currently).
    >
    > How would it break the code exactly? It more sounded like an optimization
    > to me. Would it generate incorrect code without it?


    See http://gcc.gnu.org/PR33294 for testcase which fails if compiled with gcc 4.2
    and above. Yes, incorrect code can be generated without the patch as demonstrated by
    testcase, but i didn't analyze why kernel appears to work with 4.2 currently.
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