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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-10-31 16:32:19 +0000 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-11-27 23:53:48 +0000 |
commit | 303c6443659bc1dc911356f5de149f48ff1d97b8 (patch) | |
tree | 75da0aef28ec8e843cdeb24c96349bdf812e2740 /arch/arm/mm/copypage-v4wb.c | |
parent | 063b0a4207e43acbeff3d4b09f43e750e0212b48 (diff) | |
download | linux-303c6443659bc1dc911356f5de149f48ff1d97b8.tar.gz linux-303c6443659bc1dc911356f5de149f48ff1d97b8.tar.bz2 linux-303c6443659bc1dc911356f5de149f48ff1d97b8.zip |
[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.c | 28 |
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, }; |