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    SubjectRe: [PATCH 07/12] x86/virt/guest/xen: Remove use of pgd_list from the Xen guest code
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    On Thu, Jun 11, 2015 at 1:37 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    >
    > Don't use "for_each_process_thread(g, p)". You only care about each
    > mm, and threads all share the same mm, so just do
    >
    > for_each_process(p)
    >
    > instead of iterating over all threads too.

    Hmm. I may be wrong. It strikes me that one of the group leaders might
    have exited but the subthreads live on. We'd see p->mm being NULL,
    even though the mm was originally in use.

    Ugh. So maybe the code really does need to iterate over all threads.

    Linus


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