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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-05-10 17:30:47 +0100 |
|---|---|---|
| committer | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-05-10 17:30:47 +0100 |
| commit | 08ee4e4c5fd3fb0857eeb6a5a0ff66881432e8a3 (patch) | |
| tree | a4c70b10a7bbd4dd5606a5d5122d98fd2c82b229 | |
| parent | d2bab05ac1f9a2f5ddcd2f3256237e5c47fc127f (diff) | |
| download | linux-stable-08ee4e4c5fd3fb0857eeb6a5a0ff66881432e8a3.tar.gz linux-stable-08ee4e4c5fd3fb0857eeb6a5a0ff66881432e8a3.tar.bz2 linux-stable-08ee4e4c5fd3fb0857eeb6a5a0ff66881432e8a3.zip | |
[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>
| -rw-r--r-- | arch/arm/mm/copypage-v6.c | 28 |
1 files changed, 6 insertions, 22 deletions
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c index 694ac8208858..a8c00236bd3d 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); |