arm64: Allow a capability to be checked on a single CPU

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Now that the capabilities are only available once all the CPUs
have booted, we're unable to check for a particular feature
in any subsystem that gets initialized before then.

In order to support this, introduce a local_cpu_has_cap() function
that tests for the presence of a given capability independently
of the whole framework.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[ Added preemptible() check ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[will: remove duplicate initialisation of caps in this_cpu_has_cap]
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

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Marc Zyngier 2016-04-22 12:25:32 +01:00 • committed by Will Deacon

parent 92406f0cc9

commit e3661b128e

2 changed files with 20 additions and 0 deletions

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arch/arm64/include/asm/cpufeature.h

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18

arch/arm64/kernel/cpufeature.c

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