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authorKhem Raj <raj.khem@gmail.com>2010-06-03 23:05:15 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-06-08 14:42:18 -0400
commit9a40ac86152c9cffd3dca482a15ddf9a8c5716b3 (patch)
tree52a74a0826d771141b78b1a04928e75df5726ebf /arch/arm/mm/copypage-v4wt.c
parent76962be8491b18ae7ff4fd6a4accd398bdb402a2 (diff)
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>
Diffstat (limited to 'arch/arm/mm/copypage-v4wt.c')
-rw-r--r--arch/arm/mm/copypage-v4wt.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mm/copypage-v4wt.c b/arch/arm/mm/copypage-v4wt.c
index 172e6a55458e..30c7d048a324 100644
--- a/arch/arm/mm/copypage-v4wt.c
+++ b/arch/arm/mm/copypage-v4wt.c
@@ -25,7 +25,7 @@ v4wt_copy_user_page(void *kto, const void *kfrom)
25{ 25{
26 asm("\ 26 asm("\
27 stmfd sp!, {r4, lr} @ 2\n\ 27 stmfd sp!, {r4, lr} @ 2\n\
28 mov r2, %0 @ 1\n\ 28 mov r2, %2 @ 1\n\
29 ldmia r1!, {r3, r4, ip, lr} @ 4\n\ 29 ldmia r1!, {r3, r4, ip, lr} @ 4\n\
301: stmia r0!, {r3, r4, ip, lr} @ 4\n\ 301: stmia r0!, {r3, r4, ip, lr} @ 4\n\
31 ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\ 31 ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\
@@ -40,7 +40,7 @@ v4wt_copy_user_page(void *kto, const void *kfrom)
40 mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\ 40 mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\
41 ldmfd sp!, {r4, pc} @ 3" 41 ldmfd sp!, {r4, pc} @ 3"
42 : 42 :
43 : "I" (PAGE_SIZE / 64)); 43 : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
44} 44}
45 45
46void v4wt_copy_user_highpage(struct page *to, struct page *from, 46void v4wt_copy_user_highpage(struct page *to, struct page *from,