From bda869c614c937c318547c3ee1d65a316b693c21 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Thu, 9 Apr 2009 15:05:10 +0200 Subject: [PATCH] x86: cacheinfo: use L3 cache index disable feature only for CPUs that support it AMD family 0x11 CPU doesn't support the feature. Some AMD family 0x10 CPUs do not support it or have an erratum, see erratum #382 in "Revision Guide for AMD Family 10h Processors, 41322 Rev. 3.40 February 2009". Signed-off-by: Andreas Herrmann CC: Mark Langsdorf Cc: Andrew Morton LKML-Reference: <20090409130510.GG31527@alberich.amd.com> Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/intel_cacheinfo.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c index 483eda9..7240126 100644 --- a/arch/x86/kernel/cpu/intel_cacheinfo.c +++ b/arch/x86/kernel/cpu/intel_cacheinfo.c @@ -291,6 +291,14 @@ amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf) { if (index < 3) return; + + if (boot_cpu_data.x86 == 0x11) + return; + + /* see erratum #382 */ + if ((boot_cpu_data.x86 == 0x10) && (boot_cpu_data.x86_model < 0x8)) + return; + this_leaf->can_disable = 1; } -- 2.7.4