1 files changed, 16 insertions, 7 deletions

diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 6273bf74c203..254cee9f0b7b 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -62,6 +62,18 @@ int apic_verbosity;
 
 static void apic_pm_activate(void);
 
+int modern_apic(void)
+{
+        unsigned int lvr, version;
+        /* AMD systems use old APIC versions, so check the CPU */
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+                boot_cpu_data.x86 >= 0xf)
+                return 1;
+        lvr = apic_read(APIC_LVR);
+        version = GET_APIC_VERSION(lvr);
+        return version >= 0x14;
+}
+
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.
  * each architecture has to answer this themselves.
@@ -119,10 +131,7 @@ void enable_NMI_through_LVT0 (void * dummy)
 
 int get_physical_broadcast(void)
 {
-        unsigned int lvr, version;
-        lvr = apic_read(APIC_LVR);
-        version = GET_APIC_VERSION(lvr);
-        if (!APIC_INTEGRATED(version) || version >= 0x14)
+        if (modern_apic())
                 return 0xff;
         else
                 return 0xf;
@@ -349,9 +358,9 @@ int __init verify_local_APIC(void)
 
 void __init sync_Arb_IDs(void)
 {
-        /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */
-        unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
-        if (ver >= 0x14)        /* P4 or higher */
+        /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1
+           And not needed on AMD */
+        if (modern_apic())
                 return;
         /*
          * Wait for idle.