arm64: capabilities: Allow features based on local CPU scope

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So far we have treated the feature capabilities as system wide
and this wouldn't help with features that could be detected locally
on one or more CPUs (e.g, KPTI, Software prefetch). This patch
splits the feature detection to two phases :

 1) Local CPU features are checked on all boot time active CPUs.
 2) System wide features are checked only once after all CPUs are
    active.

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>

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Suzuki K Poulose 2018-03-26 15:12:37 +01:00 • committed by Will Deacon

parent d69fe9a7e7

commit fbd890b9b8

1 changed files with 11 additions and 6 deletions

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arch/arm64/kernel/cpufeature.c

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