From 40d4bf0207f82e26ea8ce9e91d136a315afdca2e Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Wed, 10 Feb 2021 18:51:48 -0800 Subject: [PATCH] FROMLIST: ARM: kprobes: fix UNPREDICTABLE warnings GNU as warns twice for this file: Warning: using r15 results in unpredictable behaviour via the Arm ARM: K1.1.1 Overview of the constraints on Armv7 UNPREDICTABLE behaviors The term UNPREDICTABLE describes a number of cases where the architecture has a feature that software must not use. Ard notes: These are selftests that aim to ensure that kprobe never attempts to replace the opcodes in question with a probe, but they are not actually executed, or expected to occur in real code. Reported-by: kernelci.org bot Suggested-by: Peter Smith Suggested-by: Renato Golin Suggested-by: David Spickett Signed-off-by: Nick Desaulniers Acked-by: Ard Biesheuvel Link: https://github.com/ClangBuiltLinux/linux/issues/1271 Link: https://reviews.llvm.org/D95586 Bug: 141693040 Link: https://lore.kernel.org/linux-arm-kernel/20210211025149.3544593-2-ndesaulniers@google.com/ Change-Id: I42333d7e64a98f739ab13916f61a587143fec7f8 --- arch/arm/probes/kprobes/test-arm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/probes/kprobes/test-arm.c b/arch/arm/probes/kprobes/test-arm.c index 8866aedfdea2..f27de3e6dd2d 100644 --- a/arch/arm/probes/kprobes/test-arm.c +++ b/arch/arm/probes/kprobes/test-arm.c @@ -169,10 +169,10 @@ void kprobe_arm_test_cases(void) /* Data-processing with PC as a target and status registers updated */ TEST_UNSUPPORTED("movs pc, r1") - TEST_UNSUPPORTED("movs pc, r1, lsl r2") + TEST_UNSUPPORTED(__inst_arm(0xe1b0f211) " @movs pc, r1, lsl r2") TEST_UNSUPPORTED("movs pc, #0x10000") TEST_UNSUPPORTED("adds pc, lr, r1") - TEST_UNSUPPORTED("adds pc, lr, r1, lsl r2") + TEST_UNSUPPORTED(__inst_arm(0xe09ef211) " @adds pc, lr, r1, lsl r2") TEST_UNSUPPORTED("adds pc, lr, #4") /* Data-processing with SP as target */