| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 068/102] arm64: Allow checking of a CPU-local erratum | Date | Fri, 6 Apr 2018 15:23:49 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Marc Zyngier <marc.zyngier@arm.com>
commit 8f4137588261d7504f4aa022dc9d1a1fd1940e8e upstream.
this_cpu_has_cap() only checks the feature array, and not the errata one. In order to be able to check for a CPU-local erratum, allow it to inspect the latter as well.
This is consistent with cpus_have_cap()'s behaviour, which includes errata already.
Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Alex Shi <alex.shi@linaro.org> [v4.9 backport] Signed-off-by: Mark Rutland <mark.rutland@arm.com> [v4.9 backport] Tested-by: Will Deacon <will.deacon@arm.com> Tested-by: Greg Hackmann <ghackmann@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/arm64/kernel/cpufeature.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
--- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1103,20 +1103,29 @@ static void __init setup_feature_capabil * Check if the current CPU has a given feature capability. * Should be called from non-preemptible context. */ -bool this_cpu_has_cap(unsigned int cap) +static bool __this_cpu_has_cap(const struct arm64_cpu_capabilities *cap_array, + unsigned int cap) { const struct arm64_cpu_capabilities *caps; if (WARN_ON(preemptible())) return false; - for (caps = arm64_features; caps->desc; caps++) + for (caps = cap_array; caps->desc; caps++) if (caps->capability == cap && caps->matches) return caps->matches(caps, SCOPE_LOCAL_CPU); return false; } +extern const struct arm64_cpu_capabilities arm64_errata[]; + +bool this_cpu_has_cap(unsigned int cap) +{ + return (__this_cpu_has_cap(arm64_features, cap) || + __this_cpu_has_cap(arm64_errata, cap)); +} + void __init setup_cpu_features(void) { u32 cwg;
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