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    SubjectRe: [PATCH 02/30] x86-64: Use explicit sizes in sigcontext.h, prepare for x32
    Date
    On Monday 20 February 2012, H. Peter Anvin wrote:
    > We are using __u64 as x86-32 compatible since we are sharing most of the
    > really complex path (like ioctl) with i386 much more so than x86-64. So
    > it is defined in userspace as:
    >
    > typedef unsigned long long __u64 __attribute__((aligned(4)));
    >
    > __aligned_u64 obviously is naturally aligned, which matches uint64_t is
    > userspace.

    Has someone audited the interfaces to check if there are data structures that
    use a plain signed or unsigned "long long" instead of __s64/__u64 in places
    where i386 differs from the other compat implementations?

    I found DRM_IOCTL_UPDATE_DRAW, but there could be more like this one.

    Arnd


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