Messages in this thread | | | From | Linus Torvalds <> | Date | Thu, 7 Jan 2021 12:17:40 -0800 | Subject | Re: [PATCH 2/2] mm: soft_dirty: userfaultfd: introduce wrprotect_tlb_flush_pending |
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On Thu, Jan 7, 2021 at 12:04 PM Andrea Arcangeli <aarcange@redhat.com> wrote: > > However there are two cases that could wrprotecting exclusive anon > pages with only the mmap_read_lock:
I still think the real fix is "Don't do that then", and just take the write lock.
The UFFDIO_WRITEPROTECT case simply isn't that critical. It's not a normal operation. Same goes for softdirty.
Why have those become _so_ magical that they can break the VM for everybody else?
Linus
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