From 7021d86afa6f3a8bf76218ac97f5847a6d985730 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Mon, 29 Dec 2008 06:40:35 +0000 Subject: [PATCH] powerpc/mm: Make clear_fixmap() actually work The clear_fixmap() routine issues map_page() with flags set to 0. Currently this causes a BUG_ON() inside the map_page(), as it assumes that a PTE should be clear before mapping. This patch makes the map_page() to trigger the BUG_ON() only if the flags were set. Signed-off-by: Anton Vorontsov Acked-by: Kumar Gala Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/mm/pgtable_32.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 38ff35f2142a..22972cd83cc9 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -266,7 +266,8 @@ int map_page(unsigned long va, phys_addr_t pa, int flags) /* The PTE should never be already set nor present in the * hash table */ - BUG_ON(pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)); + BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) && + flags); set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags))); } -- 2.20.1