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    SubjectRe: page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP
    On Mon, 23 Aug 2004, Rajesh Venkatasubramanian wrote:

    > So there are no other active thread (mm_user) other than the current
    > exit_mmap() thread. This gives thread exclusion. So we don't need
    > mm->mmap_sem.
    > However, we have to lock out truncate()->zap_pmd_range(), rmap.c
    > functions, and other places from walking the page tables while we
    > are freeing the page tables in exit_mmap(). The page_table_lock in
    > exit_mmap() provides that exclusion.
    > That's my understanding. Correct me if I am wrong.

    Correct. I just looked through the function and it unlinks the pgd before
    unlocking page_table_lock. It frees the pgd tree content later.

    Since no mm_user is active anymore no pte ops occur and therefore also
    atomic pte operations do not need protection.

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