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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-01-14 22:15:05 +0100
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-07-02 11:01:28 +0200
commitcfd23e93a0289cf6711fd3877c5226658d87240a (patch)
tree1030f0ee5ccd59d1d80b2b5fdc892987f90fac8e /arch/avr32/mm
parentebe74597a55fef00edc80a414ef5c6477d035e0a (diff)
downloadlinux-cfd23e93a0289cf6711fd3877c5226658d87240a.tar.gz
avr32: Store virtual addresses in the PGD
Instead of storing physical addresses along with page flags in the PGD, store virtual addresses and use NULL to indicate a not present second-level page table. A non-page-aligned page table indicates a bad PMD. This simplifies the TLB miss handler since it no longer has to check the Present bit and no longer has to convert the PGD entry from physical to virtual address. Instead, it has to check for a NULL entry, which is slightly cheaper than either. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/mm')
-rw-r--r--arch/avr32/mm/init.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index 0e77578..3f90a87 100644
--- a/arch/avr32/mm/init.c
+++ b/arch/avr32/mm/init.c
@@ -24,9 +24,11 @@
#include <asm/setup.h>
#include <asm/sections.h>
+#define __page_aligned __attribute__((section(".data.page_aligned")))
+
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-pgd_t swapper_pg_dir[PTRS_PER_PGD];
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned;
struct page *empty_zero_page;
EXPORT_SYMBOL(empty_zero_page);