On Tue, 2009-12-08 at 19:14 +0200, kordex - wrote:
> Hello,
>
> I turned some debuging options in order to trace rcutree problems but
> after turning debugging on it began just to loop on this:
>
> http://xnet.fi/opt/pics/pgtable_badness.jpg
> 1.5M pgtable_badness.jpg
>
> I am sorry that I could not produce full dmesg.
>
> Kernel config: http://xnet.fi/opt/apps/lkml-2.6.32-vanilla.debug.config.txt
Thanks for your report.
Does that patch fixes it ?
powerpc/mm: Fix a WARN_ON() with CONFIG_DEBUG_PAGEALLOC and CONFIG_DEBUG_VM
Set need to call __set_pte_at() and not set_pte_at() from __change_page_attr()
since the later will perform checks with CONFIG_DEBUG_VM that aren't suitable
to the way we override an existing PTE. (More specifically, it doesn't let
you write over a present PTE).
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
Index: linux-work/arch/powerpc/mm/pgtable_32.c
===================================================================
--- linux-work.orig/arch/powerpc/mm/pgtable_32.c 2009-12-09
18:06:14.000000000 +1100
+++ linux-work/arch/powerpc/mm/pgtable_32.c 2009-12-09 18:06:16.000000000
+1100
@@ -356,7 +356,7 @@ static int __change_page_attr(struct pag
return 0;
if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
return -EINVAL;
- set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
+ __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
wmb();
#ifdef CONFIG_PPC_STD_MMU
flush_hash_pages(0, address, pmd_val(*kpmd), 1);
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