Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 18 Mar 2012 15:01:08 -0700 | Subject | Re: [rfc][patches] fix for munmap/truncate races |
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On Sun, Mar 18, 2012 at 12:07 PM, Al Viro <viro@zeniv.linux.org.uk> wrote: > - tlb_finish_mmu(&tlb, 0, end); > + tlb_finish_mmu(&tlb, 0, -1);
Hmm. The fact that you drop the end pointer means that some architectures that optimize the TLB flushing for ranges now effectively can't do it any more.
Now, I think it's only ia64 that really is affected, but it *might* matter.
In particular, ia64 has some logic for "if you only flush one single region, you can optimize it", and the region sizes are in the terabytes. And I'm pretty sure you broke that - I'm just not entirely sure how much we care.
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