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arm64: Allow checking of a CPU-local erratum

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commit 8f41375882 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>
This commit is contained in:
Marc Zyngier
2018-04-03 12:09:15 +01:00
committed by Greg Kroah-Hartman
parent 7354772afe
commit 1d648e44e9
1 changed files with 11 additions and 2 deletions
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13
arch/arm64/kernel/cpufeature.c
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@@ -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;