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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 <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-12-08 21:08:44 +00:00
parent 030bdc3fd0
commit 50891457f1
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/mm/pgtable_32.c
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@ -382,7 +382,7 @@ static int __change_page_attr(struct page *page, pgprot_t prot)
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), 0);
wmb();
#ifdef CONFIG_PPC_STD_MMU
flush_hash_pages(0, address, pmd_val(*kpmd), 1);