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    SubjectRe: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch
    Andi Kleen <> wrote:
    > Andrew Morton <> writes:
    > > Looking at Andi's patch, it is also a dead box if the fault happens inside
    > > down_write(mmap_sem). That should be fixed, methinks.
    > The only way to fix all that would be to move the instruction checks early
    > into the fast path.

    Well the deadlock avoidance only needs to happen if the fault occured in
    kernel mode. Presumably most faults are in userspace, so most of the
    overhead can be avoided.

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