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arm64: alternatives: add cpu feature for lse atomics

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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>
This commit is contained in:
Will Deacon 2015-02-04 12:17:55 +00:00
parent 40a1db2434
commit d964b7229e
2 changed files with 3 additions and 1 deletions
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3
arch/arm64/include/asm/cpufeature.h
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@ -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__

1
arch/arm64/kernel/setup.c
View File

@ -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: