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    SubjectRe: [patch 02/11] syslets: add syslet.h include file, user API/ABI definitions
    Ingo Molnar writes:

    > add include/linux/syslet.h which contains the user-space API/ABI
    > declarations. Add the new header to include/linux/Kbuild as well.

    > +struct syslet_uatom {
    > + unsigned long flags;
    > + unsigned long nr;
    > + long __user *ret_ptr;
    > + struct syslet_uatom __user *next;
    > + unsigned long __user *arg_ptr[6];
    > + /*
    > + * User-space can put anything in here, kernel will not
    > + * touch it:
    > + */
    > + void __user *private;
    > +};

    This structure, with its unsigned longs and pointers, is going to
    create enormous headaches for 32-bit processes on 64-bit machines as
    far as I can see---and on ppc64 machines, almost all processes are
    32-bit, since there is no inherent speed penalty for running in 32-bit
    mode, and some space savings.

    Have you thought about how you will handle compatibility for 32-bit
    processes? The issue will arise for x86_64 and ia64 (among others)
    too, I would think.

    Paul.
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