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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completely outdated.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: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:29 +02:00 committed by Andi Kleen
parent 6c96a29f20
commit 3f14c746a6
1 changed files with 2 additions and 26 deletions
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28
arch/x86_64/kernel/apic.c
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@ -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
*/