[PATCH 20/29] arm64: Allow checking of a CPU-local erratum
From: Alex Shi <hidden>
Date: 2018-02-28 04:00:03
Also in:
lkml, stable
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: Marc Zyngier <redacted> 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 <redacted> Acked-by: Daniel Lezcano <redacted> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Marc Zyngier <redacted> Signed-off-by: Alex Shi <redacted> --- arch/arm64/kernel/cpufeature.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 3ec6517..4e5dff1 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c@@ -1103,20 +1103,29 @@ static void __init setup_feature_capabilities(void) * 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;
--
2.7.4