[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completely outdated.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>

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index c6ca100..78c43b1 100644 (file)
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -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
         */