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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-04-22 12:25:32 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-04-25 15:13:05 +0100 |
| commit | e3661b128e53ee281e1e7c589a5b647890bd6d7c (patch) | |
| tree | 456828adc71dc6cc53861c704a55ce425805db83 /arch/arm64/include | |
| parent | 92406f0cc9e3d5cc77bf3de6d68c9c2373dcd701 (diff) | |
| download | op-kernel-dev-e3661b128e53ee281e1e7c589a5b647890bd6d7c.zip op-kernel-dev-e3661b128e53ee281e1e7c589a5b647890bd6d7c.tar.gz | |
arm64: Allow a capability to be checked on a single CPU
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>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index e501e4a..d39db63 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -109,6 +109,8 @@ struct arm64_cpu_capabilities { extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); +bool this_cpu_has_cap(unsigned int cap); + static inline bool cpu_have_feature(unsigned int num) { return elf_hwcap & (1UL << num); |
