ARM: 6164/1: Add kto and kfrom to input operands list.

When functions incoming parameters are not in input operands list gcc
4.5 does not load the parameters into registers before calling this
function but the inline assembly assumes valid addresses inside this
function. This breaks the code because r0 and r1 are invalid when
execution enters v4wb_copy_user_page ()

Also the constant needs to be used as third input operand so account
for that as well.

Tested on qemu arm.

CC: <stable@kernel.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/mm/copypage-v4wb.c b/arch/arm/mm/copypage-v4wb.c
index 7c2eb55cd4a9..cb589cbb2b6c 100644
--- a/arch/arm/mm/copypage-v4wb.c
+++ b/arch/arm/mm/copypage-v4wb.c
@@ -27,7 +27,7 @@ v4wb_copy_user_page(void *kto, const void *kfrom)
 {
         asm("\
         stmfd   sp!, {r4, lr}                   @ 2\n\
-        mov     r2, %0                          @ 1\n\
+        mov     r2, %2                          @ 1\n\
         ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
 1:      mcr     p15, 0, r0, c7, c6, 1           @ 1   invalidate D line\n\
         stmia   r0!, {r3, r4, ip, lr}           @ 4\n\
@@ -44,7 +44,7 @@ v4wb_copy_user_page(void *kto, const void *kfrom)
         mcr     p15, 0, r1, c7, c10, 4          @ 1   drain WB\n\
         ldmfd    sp!, {r4, pc}                  @ 3"
         :
-        : "I" (PAGE_SIZE / 64));
+        : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
 }
 
 void v4wb_copy_user_highpage(struct page *to, struct page *from,