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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-v4wb.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-v4wb.c')
-rw-r--r--arch/arm/mm/copypage-v4wb.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/arch/arm/mm/copypage-v4wb.c b/arch/arm/mm/copypage-v4wb.c
index 186a68a794a9..9144a96037bf 100644
--- a/arch/arm/mm/copypage-v4wb.c
+++ b/arch/arm/mm/copypage-v4wb.c
@@ -64,31 +64,31 @@ void v4wb_copy_user_highpage(struct page *to, struct page *from,
*
* Same story as above.
*/
-void __attribute__((naked))
-v4wb_clear_user_page(void *kaddr, unsigned long vaddr)
+void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr)
{
+ void *kaddr = kmap_atomic(page, KM_USER0);
asm("\
- str lr, [sp, #-4]!\n\
- mov r1, %0 @ 1\n\
+ mov r1, %1 @ 1\n\
mov r2, #0 @ 1\n\
mov r3, #0 @ 1\n\
mov ip, #0 @ 1\n\
mov lr, #0 @ 1\n\
-1: mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line\n\
- stmia r0!, {r2, r3, ip, lr} @ 4\n\
- stmia r0!, {r2, r3, ip, lr} @ 4\n\
- mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line\n\
- stmia r0!, {r2, r3, ip, lr} @ 4\n\
- stmia r0!, {r2, r3, ip, lr} @ 4\n\
+1: mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
subs r1, r1, #1 @ 1\n\
bne 1b @ 1\n\
- mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB\n\
- ldr pc, [sp], #4"
+ mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
:
- : "I" (PAGE_SIZE / 64));
+ : "r" (kaddr), "I" (PAGE_SIZE / 64)
+ : "r1", "r2", "r3", "ip", "lr");
+ kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns v4wb_user_fns __initdata = {
- .cpu_clear_user_page = v4wb_clear_user_page,
+ .cpu_clear_user_highpage = v4wb_clear_user_highpage,
.cpu_copy_user_highpage = v4wb_copy_user_highpage,
};