Messages in this thread Patch in this message | | | Date | Tue, 28 Oct 2014 13:57:53 -0400 | From | Dave Jones <> | Subject | [PATCH] Don't enable F00F workaround on Intel Quark processors. |
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The Intel Quark processor is a part of family 5, but does not have the F00F bug present in Pentiums of the same family.
Pentiums were models 0 through 8, Quark is model 9.
Cc: Bryan O'Donoghue <pure.logic@nexus-software.ie> Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 1ef456273172..9cc6b6f25f42 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -213,12 +213,13 @@ static void intel_workarounds(struct cpuinfo_x86 *c) { #ifdef CONFIG_X86_F00F_BUG /* - * All current models of Pentium and Pentium with MMX technology CPUs + * All models of Pentium and Pentium with MMX technology CPUs * have the F0 0F bug, which lets nonprivileged users lock up the * system. Announce that the fault handler will be checking for it. + * The Quark is also family 5, but does not have the same bug. */ clear_cpu_bug(c, X86_BUG_F00F); - if (!paravirt_enabled() && c->x86 == 5) { + if (!paravirt_enabled() && c->x86 == 5 && c->x86_model < 9) { static int f00f_workaround_enabled; set_cpu_bug(c, X86_BUG_F00F);
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