Subject: [x86 VIA] Identify number of cores of nano X2 and Quad Core E chips From: Carsten Emde Date: Fri, Aug 31 2012 14:53:51 +0100 The VIA nano X2 and Quad Core E chips have two and four cores on chip, respectively. This patch is needed to let the kernel correctly recognize them. The related CPUID definitions were obtained from VIA Tech Support. VIA C7 Processor 1000MHz: Centaur 1 core found on chip VIA Nano X2 L4050 @ 1.4 GHz: Centaur 2 cores found on chip VIA QuadCore L4700 @ 1.2+ GHz: Centaur 4 cores found on chip Signed-off-by: Carsten Emde CC: Markus Krämer CC: Jörg Erkel CC: Jessie Wu --- arch/x86/kernel/cpu/centaur.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) Index: linux-3.18.11-rt7/arch/x86/kernel/cpu/centaur.c =================================================================== --- linux-3.18.11-rt7.orig/arch/x86/kernel/cpu/centaur.c +++ linux-3.18.11-rt7/arch/x86/kernel/cpu/centaur.c @@ -62,7 +62,11 @@ static void init_c3(struct cpuinfo_x86 * c->x86_cache_alignment = c->x86_clflush_size * 2; set_cpu_cap(c, X86_FEATURE_REP_GOOD); } - +#ifdef CONFIG_SMP + c->x86_max_cores = (cpuid_ebx(0x00000001) >> 16) & 0xff; + printk(KERN_INFO "Centaur %d logical processor%s on chip\n", + c->x86_max_cores, c->x86_max_cores == 1 ? "" : "s"); +#endif cpu_detect_cache_sizes(c); }