On 06/21/2010 05:29 PM, Andrea Arcangeli wrote:
On Mon, Jun 21, 2010 at 05:18:56PM +0300, Gleb Natapov wrote:
Avi did the fix. We discussed using MADV_DONTFORK for that, but calling
madvise() from kernel deemed to be messy.
Agree that calling madvise looks messy. It's possible to set
VM_DONTCOPY under mmap_sem write mode and it'll work as well.
But we aren't guaranteed to get our own vma, yes?
But surely we can as well keep this quicker fix until the fork vs gup
race is fixed, and back it out later.
Right.
Note kvm shouldn't be calling do_mmap() in any case. I let that in
because it was simple and because we had a userspace interface relying
on that, but that's no longer the case, so I'll make that page kernel owned.
--
error compiling committee.c: too many arguments to function
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