From c12ceb766eb5ac975c1145d51236fcdcf81a6578 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 21 May 2007 14:31:47 +0200 Subject: [PATCH] i386: Clear MCE flag on AMD K6 It reports machine check capability in CPUID, but doesn't actually implement all the necessary MSRs of the standard Intel machine check architecture. This fixes a boot failure on K6s recently introduced. Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/kernel/cpu/amd.c | 4 ++++ arch/i386/kernel/cpu/mcheck/k7.c | 6 +++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c index 4fec702..6f47eee 100644 --- a/arch/i386/kernel/cpu/amd.c +++ b/arch/i386/kernel/cpu/amd.c @@ -280,6 +280,10 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c) if (c->x86 == 0x10 && !force_mwait) clear_bit(X86_FEATURE_MWAIT, c->x86_capability); + + /* K6s reports MCEs but don't actually have all the MSRs */ + if (c->x86 < 6) + clear_bit(X86_FEATURE_MCE, c->x86_capability); } static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 * c, unsigned int size) diff --git a/arch/i386/kernel/cpu/mcheck/k7.c b/arch/i386/kernel/cpu/mcheck/k7.c index f9fa414..eef63e3 100644 --- a/arch/i386/kernel/cpu/mcheck/k7.c +++ b/arch/i386/kernel/cpu/mcheck/k7.c @@ -72,12 +72,12 @@ void amd_mcheck_init(struct cpuinfo_x86 *c) u32 l, h; int i; - machine_check_vector = k7_machine_check; - wmb(); - if (!cpu_has(c, X86_FEATURE_MCE)) return; + machine_check_vector = k7_machine_check; + wmb(); + printk (KERN_INFO "Intel machine check architecture supported.\n"); rdmsr (MSR_IA32_MCG_CAP, l, h); if (l & (1<<8)) /* Control register present ? */ -- 2.7.4