[PATCH 4.9 05/43] arm64: capabilities: Move errata work around check on boot CPU

Greg Kroah-Hartman
2022-04-06T20:13:05Z

From: Suzuki K Poulose <suzuki.poulose@arm.com>

[ Upstream commit 5e91107b06811f0ca147cebbedce53626c9c4443 ]

We trigger CPU errata work around check on the boot CPU from
smp_prepare_boot_cpu() to make sure that we run the checks only
after the CPU feature infrastructure is initialised. While this
is correct, we can also do this from init_cpu_features() which
initilises the infrastructure, and is called only on the
Boot CPU. This helps to consolidate the CPU capability handling
to cpufeature.c. No functional changes.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/kernel/cpufeature.c | 5 +++++
arch/arm64/kernel/smp.c | 6 ------
2 files changed, 5 insertions(+), 6 deletions(-)

--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -476,6 +476,11 @@ void __init init_cpu_features(struct cpu
init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2);
}

+ /*
+ * Run the errata work around checks on the boot CPU, once we have
+ * initialised the cpu feature infrastructure.
+ */
+ update_cpu_errata_workarounds();
}

static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -444,12 +444,6 @@ void __init smp_prepare_boot_cpu(void)
jump_label_init();
cpuinfo_store_boot_cpu();
save_boot_cpu_run_el();
- /*
- * Run the errata work around checks on the boot CPU, once we have
- * initialised the cpu feature infrastructure from
- * cpuinfo_store_boot_cpu() above.
- */
- update_cpu_errata_workarounds();
}

static u64 __init of_get_cpu_mpidr(struct device_node *dn)