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Commit 75c1d539 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc: Fix CONFIG_DEBUG_PAGEALLOC on 603/e300 



So we tried to speed things up a bit using flush_hash_pages() directly
but that falls over on 603 of course meaning we fail to flush the TLB
properly and we may even end up having it corrupt memory randomly by
accessing a hash table that doesn't exist.

This removes the "optimization" by always going through flush_tlb_page()
for now at least.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent aef40e87

arch/powerpc/mm/pgtable_32.c

+0 −4
Original line number Original line Diff line number Diff line
@@ -393,11 +393,7 @@ static int __change_page_attr(struct page *page, pgprot_t prot) 
		return -EINVAL;

		return -EINVAL;

	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);

	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);

	wmb();

	wmb();

#ifdef CONFIG_PPC_STD_MMU

	flush_hash_pages(0, address, pmd_val(*kpmd), 1);

#else

	flush_tlb_page(NULL, address);

	flush_tlb_page(NULL, address);

#endif

	pte_unmap(kpte);

	pte_unmap(kpte);





	return 0;

	return 0;