lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] clearpage: provide our own clear_user_highpage()

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/mm/copypage-v3.c
View File

@@ -54,10 +54,10 @@ void v3_copy_user_highpage(struct page *to, struct page *from,
*
* FIXME: do we need to handle cache stuff...
*/
void __attribute__((naked)) v3_clear_user_page(void *kaddr, unsigned long vaddr)
void v3_clear_user_highpage(struct page *page, unsigned long vaddr)
{
void *kaddr = kmap_atomic(page, KM_USER0);
asm("\n\
str lr, [sp, #-4]!\n\
mov r1, %1 @ 1\n\
mov r2, #0 @ 1\n\
mov r3, #0 @ 1\n\
@@ -68,13 +68,14 @@ void __attribute__((naked)) v3_clear_user_page(void *kaddr, unsigned long vaddr)
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"
:
: "r" (kaddr), "I" (PAGE_SIZE / 64));
: "r" (kaddr), "I" (PAGE_SIZE / 64)
: "r1", "r2", "r3", "ip", "lr");
kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns v3_user_fns __initdata = {
.cpu_clear_user_page = v3_clear_user_page,
.cpu_clear_user_highpage = v3_clear_user_highpage,
.cpu_copy_user_highpage = v3_copy_user_highpage,
};