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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-05-10 17:30:47 +0100
committerRussell King <rmk@dyn-67.arm.linux.org.uk>2005-05-10 17:30:47 +0100
commit08ee4e4c5fd3fb0857eeb6a5a0ff66881432e8a3 (patch)
treea4c70b10a7bbd4dd5606a5d5122d98fd2c82b229 /arch/arm
parentd2bab05ac1f9a2f5ddcd2f3256237e5c47fc127f (diff)
[PATCH] ARM: Use top_pmd for V6 copy/clear user_page
Remove needless page table walking for v6 page operations. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mm/copypage-v6.c28
1 files changed, 6 insertions, 22 deletions
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index 694ac820885..a8c00236bd3 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -26,8 +26,8 @@
#define to_address (0xffffc000)
#define to_pgprot PAGE_KERNEL
-static pte_t *from_pte;
-static pte_t *to_pte;
+#define TOP_PTE(x) pte_offset_kernel(top_pmd, x)
+
static DEFINE_SPINLOCK(v6_lock);
#define DCACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
@@ -74,8 +74,8 @@ void v6_copy_user_page_aliasing(void *kto, const void *kfrom, unsigned long vadd
*/
spin_lock(&v6_lock);
- set_pte(from_pte + offset, pfn_pte(__pa(kfrom) >> PAGE_SHIFT, from_pgprot));
- set_pte(to_pte + offset, pfn_pte(__pa(kto) >> PAGE_SHIFT, to_pgprot));
+ set_pte(TOP_PTE(from_address) + offset, pfn_pte(__pa(kfrom) >> PAGE_SHIFT, from_pgprot));
+ set_pte(TOP_PTE(to_address) + offset, pfn_pte(__pa(kto) >> PAGE_SHIFT, to_pgprot));
from = from_address + (offset << PAGE_SHIFT);
to = to_address + (offset << PAGE_SHIFT);
@@ -114,7 +114,7 @@ void v6_clear_user_page_aliasing(void *kaddr, unsigned long vaddr)
*/
spin_lock(&v6_lock);
- set_pte(to_pte + offset, pfn_pte(__pa(kaddr) >> PAGE_SHIFT, to_pgprot));
+ set_pte(TOP_PTE(to_address) + offset, pfn_pte(__pa(kaddr) >> PAGE_SHIFT, to_pgprot));
flush_tlb_kernel_page(to);
clear_page((void *)to);
@@ -129,21 +129,6 @@ struct cpu_user_fns v6_user_fns __initdata = {
static int __init v6_userpage_init(void)
{
if (cache_is_vipt_aliasing()) {
- pgd_t *pgd;
- pmd_t *pmd;
-
- pgd = pgd_offset_k(from_address);
- pmd = pmd_alloc(&init_mm, pgd, from_address);
- if (!pmd)
- BUG();
- from_pte = pte_alloc_kernel(&init_mm, pmd, from_address);
- if (!from_pte)
- BUG();
-
- to_pte = pte_alloc_kernel(&init_mm, pmd, to_address);
- if (!to_pte)
- BUG();
-
cpu_user.cpu_clear_user_page = v6_clear_user_page_aliasing;
cpu_user.cpu_copy_user_page = v6_copy_user_page_aliasing;
}
@@ -151,5 +136,4 @@ static int __init v6_userpage_init(void)
return 0;
}
-__initcall(v6_userpage_init);
-
+core_initcall(v6_userpage_init);