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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-12-29 06:40:35 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-01-08 05:25:17 (GMT)
commit7021d86afa6f3a8bf76218ac97f5847a6d985730 (patch)
treefb12712d5ff3ec34514c2799736263507de1918d /arch/powerpc
parent02af87a74271977d09ece9b709909dcae3f9fab9 (diff)
downloadlinux-7021d86afa6f3a8bf76218ac97f5847a6d985730.tar.xz
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 <avorontsov@ru.mvista.com> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/pgtable_32.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 38ff35f..22972cd 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)));
}