[PATCH] genirq: x86_64 irq: Kill gsi_irq_sharing

After raising the number of irqs the system supports this function is no
longer necessary.

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>

2 files changed, 1 insertions, 65 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 256fb532321e..92f79cdd9a48 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -62,8 +62,6 @@ static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return
 #include <mach_mpparse.h>
 #endif                          /* CONFIG_X86_LOCAL_APIC */
 
-static inline int gsi_irq_sharing(int gsi) { return gsi; }
-
 #endif                          /* X86 */
 
 #define BAD_MADT_ENTRY(entry, end) (                                        \
@@ -468,7 +466,7 @@ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 
 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 {
-        *irq = gsi_irq_sharing(gsi);
+        *irq = gsi;
         return 0;
 }
 
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 7d53f66394a7..e076a8fa3ac3 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -191,8 +191,6 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
 }
 #endif
 
-static u8 gsi_2_irq[NR_IRQ_VECTORS] = { [0 ... NR_IRQ_VECTORS-1] = 0xFF };
-
 /*
  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
  * shared ISA-space IRQs, so we have to support them. We are super
@@ -518,64 +516,6 @@ static inline int irq_trigger(int idx)
         return MPBIOS_trigger(idx);
 }
 
-static int next_irq = 16;
-
-/*
- * gsi_irq_sharing -- Name overload!  "irq" can be either a legacy IRQ
- * in the range 0-15, a linux IRQ in the range 0-223, or a GSI number
- * from ACPI, which can reach 800 in large boxen.
- *
- * Compact the sparse GSI space into a sequential IRQ series and reuse
- * vectors if possible.
- */
-int gsi_irq_sharing(int gsi)
-{
-        int i, tries, vector;
-
-        BUG_ON(gsi >= NR_IRQ_VECTORS);
-
-        if (platform_legacy_irq(gsi))
-                return gsi;
-
-        if (gsi_2_irq[gsi] != 0xFF)
-                return (int)gsi_2_irq[gsi];
-
-        tries = NR_IRQS;
-  try_again:
-        vector = assign_irq_vector(gsi, TARGET_CPUS);
-
-        /*
-         * Sharing vectors means sharing IRQs, so scan irq_vectors for previous
-         * use of vector and if found, return that IRQ.  However, we never want
-         * to share legacy IRQs, which usually have a different trigger mode
-         * than PCI.
-         */
-        for (i = 0; i < NR_IRQS; i++)
-                if (IO_APIC_VECTOR(i) == vector)
-                        break;
-        if (platform_legacy_irq(i)) {
-                if (--tries >= 0) {
-                        IO_APIC_VECTOR(i) = 0;
-                        goto try_again;
-                }
-                panic("gsi_irq_sharing: didn't find an IRQ using vector 0x%02X for GSI %d", vector, gsi);
-        }
-        if (i < NR_IRQS) {
-                gsi_2_irq[gsi] = i;
-                printk(KERN_INFO "GSI %d sharing vector 0x%02X and IRQ %d\n",
-                                gsi, vector, i);
-                return i;
-        }
-
-        i = next_irq++;
-        BUG_ON(i >= NR_IRQS);
-        gsi_2_irq[gsi] = i;
-        IO_APIC_VECTOR(i) = vector;
-        printk(KERN_INFO "GSI %d assigned vector 0x%02X and IRQ %d\n",
-                        gsi, vector, i);
-        return i;
-}
-
 static int pin_2_irq(int idx, int apic, int pin)
 {
         int irq, i;
@@ -597,7 +537,6 @@ static int pin_2_irq(int idx, int apic, int pin)
                 while (i < apic)
                         irq += nr_ioapic_registers[i++];
                 irq += pin;
-                irq = gsi_irq_sharing(irq);
         }
         BUG_ON(irq >= NR_IRQS);
         return irq;
@@ -1872,7 +1811,6 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
                 return -EINVAL;
         }
 
-        irq = gsi_irq_sharing(irq);
         /*
          * IRQs < 16 are already in the irq_2_pin[] map
          */