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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-10-31 19:32:19 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-11-28 02:53:48 +0300
commit303c6443659bc1dc911356f5de149f48ff1d97b8 (patch)
tree75da0aef28ec8e843cdeb24c96349bdf812e2740 /arch/arm/mm/copypage-xscale.c
parent063b0a4207e43acbeff3d4b09f43e750e0212b48 (diff)
downloadlinux-303c6443659bc1dc911356f5de149f48ff1d97b8.tar.xz
[ARM] clearpage: provide our own clear_user_highpage()
For similar reasons as copy_user_page(), we want to avoid the additional kmap_atomic if it's unnecessary. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/copypage-xscale.c')
-rw-r--r--arch/arm/mm/copypage-xscale.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
index 01bafafce181..aa9f2ff9dce0 100644
--- a/arch/arm/mm/copypage-xscale.c
+++ b/arch/arm/mm/copypage-xscale.c
@@ -113,28 +113,30 @@ void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
/*
* XScale optimised clear_user_page
*/
-void __attribute__((naked))
-xscale_mc_clear_user_page(void *kaddr, unsigned long vaddr)
+void
+xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
{
+ void *kaddr = kmap_atomic(page, KM_USER0);
asm volatile(
- "mov r1, %0 \n\
+ "mov r1, %1 \n\
mov r2, #0 \n\
mov r3, #0 \n\
-1: mov ip, r0 \n\
- strd r2, [r0], #8 \n\
- strd r2, [r0], #8 \n\
- strd r2, [r0], #8 \n\
- strd r2, [r0], #8 \n\
+1: mov ip, %0 \n\
+ strd r2, [%0], #8 \n\
+ strd r2, [%0], #8 \n\
+ strd r2, [%0], #8 \n\
+ strd r2, [%0], #8 \n\
mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\
subs r1, r1, #1 \n\
mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\
- bne 1b \n\
- mov pc, lr"
+ bne 1b"
:
- : "I" (PAGE_SIZE / 32));
+ : "r" (kaddr), "I" (PAGE_SIZE / 32)
+ : "r1", "r2", "r3", "ip");
+ kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns xscale_mc_user_fns __initdata = {
- .cpu_clear_user_page = xscale_mc_clear_user_page,
+ .cpu_clear_user_highpage = xscale_mc_clear_user_highpage,
.cpu_copy_user_highpage = xscale_mc_copy_user_highpage,
};