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Sat, 03 May 2025 04:22:54 -0700 (PDT) Date: Sat, 3 May 2025 13:21:41 +0200 In-Reply-To: <20250503112137.1962910-5-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250503112137.1962910-5-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=2200; i=ardb@kernel.org; h=from:subject; bh=z7mNfjQpBpv68AAd9mLqKIgg7+5n4LTGUtL+5ULXTPo=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIUP0jxvfFp07//euOxcgzJRTJtTTV6q79khId+maBWuLb R+FtTR3lLIwiHEwyIopsgjM/vtu5+mJUrXOs2Rh5rAygQxh4OIUgIkIrmRkaFycySHGGGp27+gj TW+tyNUn+/bn78zdVl2q9itT9IF+AsM/CxEdfuuHR0Olm06Z694+tckiatbUB6zLv70O2DXx8d5 sHgA= X-Mailer: git-send-email 2.49.0.906.g1f30a19c02-goog Message-ID: <20250503112137.1962910-8-ardb+git@google.com> Subject: [PATCH 2/3] arm64/boot: Move global CPU override variables out of BSS From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, Ard Biesheuvel , Yeoreum Yun Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel Accessing BSS will no longer be permitted form the startup code in arch/arm64/kernel/pi, as some of it executes before BSS is cleared. Clearing BSS earlier would involve managing cache coherency explicitly in software, which is a hassle we prefer to avoid. So move some variables that are assigned by the startup code out of BSS and into .data. Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/cpufeature.c | 22 ++++++++++---------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9c4d6d552b25..4f7a8050ab85 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -758,17 +758,17 @@ static const struct arm64_ftr_bits ftr_raz[] =3D { #define ARM64_FTR_REG(id, table) \ __ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override) =20 -struct arm64_ftr_override id_aa64mmfr0_override; -struct arm64_ftr_override id_aa64mmfr1_override; -struct arm64_ftr_override id_aa64mmfr2_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; +struct arm64_ftr_override __section(".data") id_aa64mmfr0_override; +struct arm64_ftr_override __section(".data") id_aa64mmfr1_override; +struct arm64_ftr_override __section(".data") id_aa64mmfr2_override; +struct arm64_ftr_override __section(".data") id_aa64pfr0_override; +struct arm64_ftr_override __section(".data") id_aa64pfr1_override; +struct arm64_ftr_override __section(".data") id_aa64zfr0_override; +struct arm64_ftr_override __section(".data") id_aa64smfr0_override; +struct arm64_ftr_override __section(".data") id_aa64isar1_override; +struct arm64_ftr_override __section(".data") id_aa64isar2_override; + +struct arm64_ftr_override __section(".data") arm64_sw_feature_override; =20 static const struct __ftr_reg_entry { u32 sys_id; --=20 2.49.0.906.g1f30a19c02-goog