[PATCH] genirq: x86_64 irq: Kill irq compression

With more irqs in the system we don't need this.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rajesh Shah <rajesh.shah@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 1 insertions, 47 deletions

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index e076a8fa3ac3..7cc29b50b0c1 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1415,8 +1415,6 @@ static inline void unlock_ExtINT_logic(void)
         spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
-int timer_uses_ioapic_pin_0;
-
 /*
  * This code may look a bit paranoid, but it's supposed to cooperate with
  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
@@ -1453,9 +1451,6 @@ static inline void check_timer(void)
         pin2  = ioapic_i8259.pin;
         apic2 = ioapic_i8259.apic;
 
-        if (pin1 == 0)
-                timer_uses_ioapic_pin_0 = 1;
-
         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
                 vector, apic1, pin1, apic2, pin2);
 
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index b8d53dfa9931..b147ab19fbd4 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -790,20 +790,11 @@ void __init mp_config_acpi_legacy_irqs(void)
         }
 }
 
-#define MAX_GSI_NUM     4096
-
 int mp_register_gsi(u32 gsi, int triggering, int polarity)
 {
         int ioapic = -1;
         int ioapic_pin = 0;
         int idx, bit = 0;
-        static int pci_irq = 16;
-        /*
-         * Mapping between Global System Interrupts, which
-         * represent all possible interrupts, to the IRQs
-         * assigned to actual devices.
-         */
-        static int gsi_to_irq[MAX_GSI_NUM];
 
         if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
                 return gsi;
@@ -836,42 +827,11 @@ int mp_register_gsi(u32 gsi, int triggering, int polarity)
         if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
                 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
                         mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
-                return gsi_to_irq[gsi];
+                return gsi;
         }
 
         mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
 
-        if (triggering == ACPI_LEVEL_SENSITIVE) {
-                /*
-                 * For PCI devices assign IRQs in order, avoiding gaps
-                 * due to unused I/O APIC pins.
-                 */
-                int irq = gsi;
-                if (gsi < MAX_GSI_NUM) {
-                        /*
-                         * Retain the VIA chipset work-around (gsi > 15), but
-                         * avoid a problem where the 8254 timer (IRQ0) is setup
-                         * via an override (so it's not on pin 0 of the ioapic),
-                         * and at the same time, the pin 0 interrupt is a PCI
-                         * type.  The gsi > 15 test could cause these two pins
-                         * to be shared as IRQ0, and they are not shareable.
-                         * So test for this condition, and if necessary, avoid
-                         * the pin collision.
-                         */
-                        if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
-                                gsi = pci_irq++;
-                        /*
-                         * Don't assign IRQ used by ACPI SCI
-                         */
-                        if (gsi == acpi_fadt.sci_int)
-                                gsi = pci_irq++;
-                        gsi_to_irq[irq] = gsi;
-                } else {
-                        printk(KERN_ERR "GSI %u is too high\n", gsi);
-                        return gsi;
-                }
-        }
-
         io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
                 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
                 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
diff --git a/include/asm-x86_64/io_apic.h b/include/asm-x86_64/io_apic.h
index b26248b0e373..171ec2dc8c04 100644
--- a/include/asm-x86_64/io_apic.h
+++ b/include/asm-x86_64/io_apic.h
@@ -162,7 +162,6 @@ extern int skip_ioapic_setup;
 extern int io_apic_get_version (int ioapic);
 extern int io_apic_get_redir_entries (int ioapic);
 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int, int);
-extern int timer_uses_ioapic_pin_0;
 #endif
 
 extern int sis_apic_bug; /* dummy */