Messages in this thread | | | Date | Sat, 4 Oct 2003 10:22:21 +0100 | From | Russell King <> | Subject | Re: mlockall and mmap of IO devices don't mix |
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On Sat, Oct 04, 2003 at 11:17:03AM +0200, Andi Kleen wrote: > > This check is only done, if it is a valid pfn (pfn_valid()) of a present > > pte. > > pfn_valid is useless, it doesn't handle all IO holes on x86 for examples.
Sounds like pfn_valid() is buggy on x86. It's supposed to definitively indicate whether the PFN is a valid page of ram (and has a valid struct page entry.) If it doesn't do that, the architecture implementation is wrong.
-- Russell King (rmk@arm.linux.org.uk) http://www.arm.linux.org.uk/personal/ Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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