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x86, cpu: Add a synthetic, always true, cpu feature

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This will be used in alternatives later as an always-replace flag.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1370772454-6106-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Borislav Petkov 2013-06-09 12:07:30 +02:00 committed by H. Peter Anvin
parent 60e019eb37
commit c3b83598c1
2 changed files with 3 additions and 1 deletions
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2
arch/x86/include/asm/cpufeature.h
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@ -92,7 +92,7 @@
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
#define X86_FEATURE_11AP (3*32+19) /* "" Bad local APIC aka 11AP */
#define X86_FEATURE_NOPL (3*32+20) /* The NOPL (0F 1F) instructions */
/* 21 available, was AMD_C1E */
#define X86_FEATURE_ALWAYS (3*32+21) /* "" Always-present feature */
#define X86_FEATURE_XTOPOLOGY (3*32+22) /* cpu topology enum extensions */
#define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
#define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */

2
arch/x86/kernel/cpu/common.c
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@ -723,6 +723,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
if (this_cpu->c_bsp_init)
this_cpu->c_bsp_init(c);
setup_force_cpu_cap(X86_FEATURE_ALWAYS);
}
void __init early_cpu_init(void)