ARM: kprobes: Fix unreliable MRS instruction tests

For the instruction 'mrs Rn, cpsr' the resulting value of Rn can vary due to
external factors we can't control. So get the test code to mask out these
indeterminate bits.

Signed-off-by: Jon Medhurst <tixy@linaro.org>

arch/arm/probes/kprobes/test-arm.c

@@ -204,9 +204,9 @@ void kprobe_arm_test_cases(void)
 #endif
 	TEST_GROUP("Miscellaneous instructions")
 
-	TEST("mrs	r0, cpsr")
-	TEST("mrspl	r7, cpsr")
-	TEST("mrs	r14, cpsr")
+	TEST_RMASKED("mrs	r",0,~PSR_IGNORE_BITS,", cpsr")
+	TEST_RMASKED("mrspl	r",7,~PSR_IGNORE_BITS,", cpsr")
+	TEST_RMASKED("mrs	r",14,~PSR_IGNORE_BITS,", cpsr")
 	TEST_UNSUPPORTED(__inst_arm(0xe10ff000) "	@ mrs r15, cpsr")
 	TEST_UNSUPPORTED("mrs	r0, spsr")
 	TEST_UNSUPPORTED("mrs	lr, spsr")