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    SubjectRe: [RFC][PATCH] introduce ptr_diff()
    > If so, the warning seems valid as sizeof(struct page) is probably not
    > (always) a power of 2. On a native build on x86_64 it is 56 bytes
    > hereover.
    > Hmm ....

    gcc just generats a mull with inverted value. mull is cheap on any
    reasonable CPU. Please fix sparse.


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