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    SubjectRe: [RHEL5 PATCH 1/4] Provide fallback full 64-bit divide/modulus ops for gcc
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    Andi Kleen <ak@suse.de> wrote:

    > At least Linus' traditional argument against this is that it's better
    > to open code these (do_div) so that it's clear to the coder that they
    > are really costly.

    do_div() is not a full replacement for __udivdi3(), __umoddi3() or
    __udivmoddi4(), though I suspect we don't need divisor >= 2^32 anywhere atm.

    There are places where the compiler emits these that aren't entirely obvious,
    one of which IIRC is in ext2 inode allocation.

    David
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