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Commit d964b722 authored Feb 04, 2015 by Will Deacon

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 <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 40a1db24

arch/arm64/include/asm/cpufeature.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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__

arch/arm64/kernel/setup.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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: