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    SubjectRe: [PATCH UPDATE] x86: ignore spurious faults
    Matt Mackall wrote:
    > There's perhaps an opportunity to do this lazy TLB trick in the mmap
    > path as well, where RW mappings are initially mapped as RO so we can
    > catch processes dirtying them and then switched to RW. If the mapping is
    > shared across threads on multiple cores, we can defer synchronizing the
    > TLBs on the others.

    I think spurious usermode faults are already dealt with.
    handle_pte_fault() does essentially the same thing as this patch:

    if (ptep_set_access_flags(vma, address, pte, entry, write_access)) {
    update_mmu_cache(vma, address, entry);
    } else {
    * This is needed only for protection faults but the arch code
    * is not yet telling us if this is a protection fault or not.
    * This still avoids useless tlb flushes for .text page faults
    * with threads.
    if (write_access)
    flush_tlb_page(vma, address);


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