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[ARM] clearpage: provide our own clear_user_highpage()

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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>
This commit is contained in:
Russell King
2008-10-31 16:32:19 +00:00
committed by Russell King
parent 063b0a4207
commit 303c644365
10 changed files with 100 additions and 100 deletions
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26
arch/arm/mm/copypage-xscale.c
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@@ -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,
};