linux-kernel - [PATCH] arm64: cpufeature: fix CPU features mismatch message

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Date:   Wed, 17 Nov 2021 00:59:22 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH] arm64: cpufeature: fix CPU features mismatch message

Fix cpp magic involved in ARM64_FTR_REG/ARM64_FTR_REG_OVERRIDE macros.
Currently ARM64_FTR_REG parameters are expanded early, resulting in
cryptic debug messages:

[    0.071123] CPU features: SANITY CHECK: Unexpected variation in (((3) << 19) | ((0) << 16) | ((0) << 12) | ((7) << 8) | ((0) << 5)). Boot CPU: 0x00022200101022, CPU4: 0x00022200101122

Make ARM64_FTR_REG to be expanded before parameters, resulting in proper
debug log:

[    0.071163] CPU features: SANITY CHECK: Unexpected variation in SYS_ID_AA64MMFR0_EL1. Boot CPU: 0x00022200101022, CPU4: 0x00022200101122

Fixes: 8f266a5d878a ("arm64: cpufeature: Add global feature override facility")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 arch/arm64/kernel/cpufeature.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 6ec7036ef7e1..72e3e3819eb4 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -573,15 +573,17 @@ static const struct arm64_ftr_bits ftr_raz[] = {
 	ARM64_FTR_END,
 };
 
-#define ARM64_FTR_REG_OVERRIDE(id, table, ovr) {		\
+#define __ARM64_FTR_REG(id, _name, table, ovr) {		\
 		.sys_id = id,					\
 		.reg = 	&(struct arm64_ftr_reg){		\
-			.name = #id,				\
+			.name = _name,				\
 			.override = (ovr),			\
 			.ftr_bits = &((table)[0]),		\
 	}}
 
-#define ARM64_FTR_REG(id, table) ARM64_FTR_REG_OVERRIDE(id, table, &no_override)
+#define ARM64_FTR_REG_OVERRIDE(id, table, ovr) __ARM64_FTR_REG(id, #id, table, ovr)
+
+#define ARM64_FTR_REG(id, table) __ARM64_FTR_REG(id, #id, table, &no_override)
 
 struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override;
 struct arm64_ftr_override __ro_after_init id_aa64pfr1_override;
-- 
2.33.0