arm64: Use static keys for CPU features

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This patch adds static keys transparently for all the cpu_hwcaps
features by implementing an array of default-false static keys and
enabling them when detected. The cpus_have_cap() check uses the static
keys if the feature being checked is a constant, otherwise the compiler
generates the bitmap test.

Because of the early call to static_branch_enable() via
check_local_cpu_errata() -> update_cpu_capabilities(), the jump labels
are initialised in cpuinfo_store_boot_cpu().

Cc: Will Deacon <will.deacon@arm.com>
Cc: Suzuki K. Poulose <Suzuki.Poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Catalin Marinas 2016-09-05 18:25:48 +01:00 • committed by Will Deacon

parent ef0da55a84

commit efd9e03fac

3 changed files with 19 additions and 3 deletions

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14

arch/arm64/include/asm/cpufeature.h

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3

arch/arm64/kernel/cpufeature.c

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5

arch/arm64/kernel/smp.c

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