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x86, cpu: Push TLB detection CPUID check down 

Push the max CPUID leaf check into the ->detect_tlb function and remove
general test case from the generic path.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344272439-29080-3-git-send-email-bp@amd64.org
Acked-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
hifive-unleashed-5.1
Borislav Petkov 2012-08-06 19:00:37 +02:00 committed by H. Peter Anvin
parent a9ad773e0d
commit 5b556332c3
2 changed files with 5 additions and 2 deletions
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3
arch/x86/kernel/cpu/common.c
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@ -940,8 +940,7 @@ void __init identify_boot_cpu(void)
#else
vgetcpu_set_mode();
#endif
if (boot_cpu_data.cpuid_level >= 2)
cpu_detect_tlb(&boot_cpu_data);
cpu_detect_tlb(&boot_cpu_data);
}
void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)

4
arch/x86/kernel/cpu/intel.c
View File

@ -648,6 +648,10 @@ static void __cpuinit intel_detect_tlb(struct cpuinfo_x86 *c)
int i, j, n;
unsigned int regs[4];
unsigned char *desc = (unsigned char *)regs;
if (c->cpuid_level < 2)
return;
/* Number of times to iterate */
n = cpuid_eax(2) & 0xFF;