linux-kernel - [PATCH v5 1/2] ARM: kprobes: fix UNPREDICTABLE warnings

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Date:   Wed, 10 Feb 2021 18:51:48 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     clang-built-linux@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Peter Smith <peter.smith@....com>,
        Renato Golin <rengolin@...temcall.eu>,
        David Spickett <david.spickett@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "kernelci . org bot" <bot@...nelci.org>
Subject: [PATCH v5 1/2] 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.

Link: https://github.com/ClangBuiltLinux/linux/issues/1271
Link: https://reviews.llvm.org/D95586
Reported-by: kernelci.org bot <bot@...nelci.org>
Suggested-by: Peter Smith <peter.smith@....com>
Suggested-by: Renato Golin <rengolin@...temcall.eu>
Suggested-by: David Spickett <david.spickett@...aro.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 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 977369f1aa48..2543106a203e 100644
--- a/arch/arm/probes/kprobes/test-arm.c
+++ b/arch/arm/probes/kprobes/test-arm.c
@@ -166,10 +166,10 @@ 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 */
-- 
2.30.0.478.g8a0d178c01-goog