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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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28
arch/arm/mm/copypage-v4mc.c
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@ -91,30 +91,30 @@ void v4_mc_copy_user_highpage(struct page *from, struct page *to,
/*
* ARMv4 optimised clear_user_page
*/
void __attribute__((naked))
v4_mc_clear_user_page(void *kaddr, unsigned long vaddr)
void v4_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
{
asm volatile(
"str lr, [sp, #-4]!\n\
void *kaddr = kmap_atomic(page, KM_USER0);
asm volatile("\
mov r1, %0 @ 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\
ldr pc, [sp], #4"
bne 1b @ 1"
:
: "I" (PAGE_SIZE / 64));
: "r" (kaddr), "I" (PAGE_SIZE / 64)
: "r1", "r2", "r3", "ip", "lr");
kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns v4_mc_user_fns __initdata = {
.cpu_clear_user_page = v4_mc_clear_user_page,
.cpu_clear_user_highpage = v4_mc_clear_user_highpage,
.cpu_copy_user_highpage = v4_mc_copy_user_highpage,
};