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Commit 3f14c746 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] Remove old "focus disabled" chipset errata workaround 



The new systems already use focus disabled and the comment was
completely outdated.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 6c96a29f

arch/x86_64/kernel/apic.c

+2 −26
Original line number Diff line number Diff line
@@ -399,32 +399,8 @@ void __cpuinit setup_local_APIC (void) 
	 */

	value |= APIC_SPIV_APIC_ENABLED;



	/*

	 * Some unknown Intel IO/APIC (or APIC) errata are biting us with

	 * certain networking cards. If high frequency interrupts are

	 * happening on a particular IOAPIC pin, plus the IOAPIC routing

	 * entry is masked/unmasked at a high rate as well then sooner or

	 * later IOAPIC line gets 'stuck', no more interrupts are received

	 * from the device. If focus CPU is disabled then the hang goes

	 * away, oh well :-(

	 *

	 * [ This bug can be reproduced easily with a level-triggered

	 *   PCI Ne2000 networking cards and PII/PIII processors, dual

	 *   BX chipset. ]

	 */

	/*

	 * Actually disabling the focus CPU check just makes the hang less

	 * frequent as it makes the interrupt distributon model be more

	 * like LRU than MRU (the short-term load is more even across CPUs).

	 * See also the comment in end_level_ioapic_irq().  --macro

	 */

#if 1

	/* Enable focus processor (bit==0) */

	value &= ~APIC_SPIV_FOCUS_DISABLED;

#else

	/* Disable focus processor (bit==1) */

	value |= APIC_SPIV_FOCUS_DISABLED;

#endif

	/* We always use processor focus */



	/*

	 * Set spurious IRQ vector

	 */