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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>
This commit is contained in:
Anton Vorontsov 2008-12-29 06:40:35 +00:00 committed by Benjamin Herrenschmidt
parent 02af87a742
commit 7021d86afa
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/mm/pgtable_32.c
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@ -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)));
}