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    SubjectRe: 2.6.32-rc3: floating-point build failure (undefined reference to `__udivdi3' in menu governor)
    Hi,

    On Wed, Oct 07, 2009 at 01:45:54PM -0400, Kyle McMartin wrote:
    > On Wed, Oct 07, 2009 at 07:34:58PM +0200, Andreas Mohr wrote:
    > > Still happening.
    > > IOW it must be somewhere inside the DIV_ROUND_CLOSEST macro or so.
    > >
    >
    > It's being a jerk and not realizing that RESOLUTION * DECAY is a power
    > of 2, so it can just do a shift...
    >
    > I don't recall if gcc 3 had these magic builtins, but if it does,
    > something like this might help since it's the u64 case that's
    > problematic.

    Uh... nope:

    In file included from kernel/sched.c:1818:
    kernel/sched_fair.c: In function `select_task_rq_fair':
    kernel/sched_fair.c:1366: implicit declaration of function `__builtin_popcountll'
    kernel/sched_fair.c:1366: implicit declaration of function `__builtin_ffsll'
    kernel/sched_fair.c:1366: warning: suggest parentheses around + or - inside shift
    kernel/sched.c: In function `update_sg_lb_stats':
    kernel/sched.c:3755: warning: suggest parentheses around + or - inside shift
    kernel/sched.c: In function `find_busiest_queue':
    kernel/sched.c:4050: warning: suggest parentheses around + or - inside shift
    make[1]: *** [kernel/sched.o] Error 1
    make: *** [kernel] Error 2


    Hmpf. Rather stuck now, ain'tcha, given that gcc 3.2.3 doesn't even have those?

    Thanks,

    Andreas Mohr


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