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Commit f44d9efd authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: fix APIC related bootup crash on Athlon XP CPUs 

warmbloodedcreature@gmail.com reported that an APIC-enabled
Asus a7v8x-x with an Athlon XP reboots early in the bootup:

   http://bugzilla.kernel.org/show_bug.cgi?id=8723



after a long marathon of spontaneous-reboot debugging, it turns
out to be caused by sync_Arb_ids(). AMD CPUs never really needed
this sequence anyway, so just return early if we meet an AMD CPU.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 52bfb360

arch/x86/kernel/apic_32.c

+1 −1
Original line number Diff line number Diff line
@@ -789,7 +789,7 @@ void __init sync_Arb_IDs(void) 
	 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not

	 * needed on AMD.

	 */

	if (modern_apic())

	if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)

		return;

	/*

	 * Wait for idle.