Messages in this thread | | | From | Linus Torvalds <> | Date | Sat, 19 Sep 2020 12:13:01 -0700 | Subject | Re: [patch RFC 00/15] mm/highmem: Provide a preemptible variant of kmap_atomic & friends |
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On Sat, Sep 19, 2020 at 10:39 AM Matthew Wilcox <willy@infradead.org> wrote: > > My concern with that is people might use kmap() and then pass the address > to a different task. So we need to audit the current users of kmap() > and convert any that do that into using vmap() instead.
Ahh. Yes, I guess they might do that. It sounds strange, but not entirely crazy - I could imagine some "PIO thread" that does IO to a page that has been set up by somebody else using kmap(). Or similar.
Linus
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