linux-kernel - [PATCH v3 26/60] arm64: Move feature overrides into the BSS section

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Message-Id: <20230307140522.2311461-27-ardb@kernel.org>
Date:   Tue,  7 Mar 2023 15:04:48 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ryan Roberts <ryan.roberts@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH v3 26/60] arm64: Move feature overrides into the BSS section

In order to allow the CPU feature override detection code to run even
earlier, move the feature override global variables into BSS, which is
the only part of the static kernel image that is mapped read-write in
the initial ID map.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arm64/kernel/cpufeature.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 88cec6c14743c4c5..0b16e676b68c6543 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -649,13 +649,13 @@ static const struct arm64_ftr_bits ftr_raz[] = {
 #define ARM64_FTR_REG(id, table)		\
 	__ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override)
 
-struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override;
-struct arm64_ftr_override __ro_after_init id_aa64pfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64pfr1_override;
-struct arm64_ftr_override __ro_after_init id_aa64zfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64smfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64isar1_override;
-struct arm64_ftr_override __ro_after_init id_aa64isar2_override;
+struct arm64_ftr_override id_aa64mmfr1_override;
+struct arm64_ftr_override id_aa64pfr0_override;
+struct arm64_ftr_override id_aa64pfr1_override;
+struct arm64_ftr_override id_aa64zfr0_override;
+struct arm64_ftr_override id_aa64smfr0_override;
+struct arm64_ftr_override id_aa64isar1_override;
+struct arm64_ftr_override id_aa64isar2_override;
 
 struct arm64_ftr_override arm64_sw_feature_override;
 
-- 
2.39.2