1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index a220239cea65..dd9e50500297 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -711,6 +711,11 @@ static void init_amd(struct cpuinfo_x86 *c)
                 set_cpu_bug(c, X86_BUG_AMD_APIC_C1E);
 
         rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
+
+        /* 3DNow or LM implies PREFETCHW */
+        if (!cpu_has(c, X86_FEATURE_3DNOWPREFETCH))
+                if (cpu_has(c, X86_FEATURE_3DNOW) || cpu_has(c, X86_FEATURE_LM))
+                        set_cpu_cap(c, X86_FEATURE_3DNOWPREFETCH);
 }
 
 #ifdef CONFIG_X86_32