From: Will Deacon Date: Wed, 4 Feb 2015 12:17:55 +0000 (+0000) Subject: arm64: alternatives: add cpu feature for lse atomics X-Git-Tag: v4.3-rc1~84^2~47 X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=d964b7229e7f94428a1e8d26999adffbe8a69db2;p=karo-tx-linux.git arm64: alternatives: add cpu feature for lse atomics Add a CPU feature for the LSE atomic instructions, so that they can be patched in at runtime when we detect that they are supported. Reviewed-by: Steve Capper Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 40e106f81f27..d9262d4b4dcd 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -26,8 +26,9 @@ #define ARM64_WORKAROUND_845719 2 #define ARM64_HAS_SYSREG_GIC_CPUIF 3 #define ARM64_HAS_PAN 4 +#define ARM64_CPU_FEAT_LSE_ATOMICS 5 -#define ARM64_NCAPS 5 +#define ARM64_NCAPS 6 #ifndef __ASSEMBLY__ diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index b2f9895ecf7b..f4fbbc884893 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -284,6 +284,7 @@ static void __init setup_processor(void) default: case 2: elf_hwcap |= HWCAP_ATOMICS; + cpus_set_cap(ARM64_CPU_FEAT_LSE_ATOMICS); case 1: /* RESERVED */ case 0: