[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completely outdated.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>

1 files changed, 2 insertions, 26 deletions

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index c6ca100a7dea..78c43b1a3064 100644
--- 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
          */