From e3661b128e53ee281e1e7c589a5b647890bd6d7c Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 22 Apr 2016 12:25:32 +0100 Subject: 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 Signed-off-by: Marc Zyngier [ Added preemptible() check ] Signed-off-by: Suzuki K Poulose [will: remove duplicate initialisation of caps in this_cpu_has_cap] Signed-off-by: Will Deacon --- arch/arm64/include/asm/cpufeature.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arm64/include') 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); -- cgit v1.1