Messages in this thread | | | Date | Tue, 22 Mar 2005 05:47:13 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: [PATCH 1/5] freepgt: free_pgtables use vma list |
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On Mon, 21 Mar 2005, David S. Miller wrote: > > flush_tlb_pgtables() on sparc64 has a BUG() check which > is basically: > > BUG((long)start > (long)end); > > This catches two cases of bogus arguments: > > 1) start --> end straddles sparc64 address space hole
That's an interesting remark. I hadn't noticed the signed long type. I believe the vma gathering in free_pgtables will have no problem with that, but what about the old code? What happens if an app does a huge munmap straddling the address space hole? Or is all the user address space below the hole?
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