Messages in this thread |  | | | Date | Mon, 19 Apr 2010 18:32:17 +0200 | | From | Andrea Arcangeli <> | | Subject | Re: Process-shared futexes on hugepages puts the kernel in an infinite loop in 2.6.32.11; is this fixed now? |
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On Mon, Apr 19, 2010 at 06:18:48PM +0200, Peter Zijlstra wrote: > Well, most poison values have that problem and still we have them. Also
That would better be fixed too to stay <4096 for higher chance of bug-detection, it doesn't make this case correct ;).
> on 64bit machines you can use POISON_POINTER_DELTA to map it outside the > virtual address range.
We've thousands of magic values there, I don't see much benefit from POISON_POINTER_DELTA other than being able to call it 0xdeadbeef+POISON_POINTER_DELTA ;). We always look the assembly to find the actual real raw pointer value (without the field offset) so I think using a range between 0xaaa and 0xbbb for the error pointers, is functional enough, but it's up to you as long as it is a address range that can't be used by userland it's surely ok ;).
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