Re: [PATCH 07/12] x86/virt/guest/xen: Remove use of pgd_list from the Xen guest code

[Linus Torvalds]

On Thu, Jun 11, 2015 at 1:37 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> 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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