powerpc: Fix VMX in interrupt check in POWER7 copy loops

The enhanced prefetch hint patches corrupt the condition register
that was used to check if we are in interrupt. Fix this by using cr1.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Author: antonblanchard

arch/powerpc/lib/copyuser_power7.S

@@ -288,7 +288,7 @@ err1;	stb	r0,0(r3)
 	std	r0,16(r1)
 	stdu	r1,-STACKFRAMESIZE(r1)
 	bl	.enter_vmx_usercopy
-	cmpwi	r3,0
+	cmpwi	cr1,r3,0
 	ld	r0,STACKFRAMESIZE+16(r1)
 	ld	r3,STACKFRAMESIZE+48(r1)
 	ld	r4,STACKFRAMESIZE+56(r1)
@@ -326,7 +326,7 @@ err1;	stb	r0,0(r3)
 	dcbt	r0,r8,0b01010	/* GO */
 .machine pop
 
-	beq	.Lunwind_stack_nonvmx_copy
+	beq	cr1,.Lunwind_stack_nonvmx_copy
 
 	/*
 	 * If source and destination are not relatively aligned we use a

arch/powerpc/lib/memcpy_power7.S

@@ -222,7 +222,7 @@ _GLOBAL(memcpy_power7)
 	std	r0,16(r1)
 	stdu	r1,-STACKFRAMESIZE(r1)
 	bl	.enter_vmx_copy
-	cmpwi	r3,0
+	cmpwi	cr1,r3,0
 	ld	r0,STACKFRAMESIZE+16(r1)
 	ld	r3,STACKFRAMESIZE+48(r1)
 	ld	r4,STACKFRAMESIZE+56(r1)
@@ -260,7 +260,7 @@ _GLOBAL(memcpy_power7)
 	dcbt	r0,r8,0b01010	/* GO */
 .machine pop
 
-	beq	.Lunwind_stack_nonvmx_copy
+	beq	cr1,.Lunwind_stack_nonvmx_copy
 
 	/*
 	 * If source and destination are not relatively aligned we use a