Messages in this thread | | | Date | Thu, 20 Dec 2007 16:17:26 -0800 (PST) | Subject | Re: 2.6.24-rc5-mm1: problems with cat /proc/kpageflags | From | David Miller <> |
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From: Mariusz Kozlowski <m.kozlowski@tuxland.pl> Date: Thu, 20 Dec 2007 20:47:55 +0100
> [ 145.128915] TSTATE: 0000004411009603 TPC: 00000000005119ac TNPC: 00000000005119b0 Y: 00000000 Not tainted > [ 145.128940] TPC: <kpagecount_read+0x94/0xe0>
My suspicion at this point is that with certain RAM layouts, simply iterating over PFN's is simply not working out.
pfn_to_page() seems to be doing no range checking, and with sparsemem vmemmap, which sparc64 always uses, this can be problematic.
It just blindly goes "vmemmap + pfn" which is asking for trouble, in particular when the physical RAM layout really is sparse.
Maybe it's enough to add a pfn_valid() check here? If pfn_valid() means there is a vmemmap translation setup for that page struct too, it would work.
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