[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>
diff --git a/arch/arm/mm/copypage-feroceon.c b/arch/arm/mm/copypage-feroceon.c
index edd7168..c3651b2 100644
--- a/arch/arm/mm/copypage-feroceon.c
+++ b/arch/arm/mm/copypage-feroceon.c
@@ -79,12 +79,11 @@
kunmap_atomic(kto, KM_USER0);
}
-void __attribute__((naked))
-feroceon_clear_user_page(void *kaddr, unsigned long vaddr)
+void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
{
+ void *kaddr = kmap_atomic(page, KM_USER0);
asm("\
- stmfd sp!, {r4-r7, lr} \n\
- mov r1, %0 \n\
+ mov r1, %1 \n\
mov r2, #0 \n\
mov r3, #0 \n\
mov r4, #0 \n\
@@ -93,19 +92,20 @@
mov r7, #0 \n\
mov ip, #0 \n\
mov lr, #0 \n\
-1: stmia r0, {r2-r7, ip, lr} \n\
+1: stmia %0, {r2-r7, ip, lr} \n\
subs r1, r1, #1 \n\
- mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
+ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
bne 1b \n\
- mcr p15, 0, r1, c7, c10, 4 @ drain WB\n\
- ldmfd sp!, {r4-r7, pc}"
+ mcr p15, 0, r1, c7, c10, 4 @ drain WB"
:
- : "I" (PAGE_SIZE / 32));
+ : "r" (kaddr), "I" (PAGE_SIZE / 32)
+ : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
+ kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns feroceon_user_fns __initdata = {
- .cpu_clear_user_page = feroceon_clear_user_page,
+ .cpu_clear_user_highpage = feroceon_clear_user_highpage,
.cpu_copy_user_highpage = feroceon_copy_user_highpage,
};