[PATCH] x86_64: Remove unique APIC/IO-APIC ID check

It is unnecessary on modern Intel or AMD systems, and that is all we support
on x86-64

Also causes problems on various systems

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 60be586..ac76843 100644 (file)
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1804,76 +1804,6 @@ device_initcall(ioapic_init_sysfs);
 
 #define IO_APIC_MAX_ID         0xFE
 
-int __init io_apic_get_unique_id (int ioapic, int apic_id)
-{
-       union IO_APIC_reg_00 reg_00;
-       static physid_mask_t apic_id_map;
-       unsigned long flags;
-       int i = 0;
-
-       /*
-        * The P4 platform supports up to 256 APIC IDs on two separate APIC 
-        * buses (one for LAPICs, one for IOAPICs), where predecessors only 
-        * supports up to 16 on one shared APIC bus.
-        * 
-        * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
-        *      advantage of new APIC bus architecture.
-        */
-
-       if (physids_empty(apic_id_map))
-               apic_id_map = phys_cpu_present_map;
-
-       spin_lock_irqsave(&ioapic_lock, flags);
-       reg_00.raw = io_apic_read(ioapic, 0);
-       spin_unlock_irqrestore(&ioapic_lock, flags);
-
-       if (apic_id >= IO_APIC_MAX_ID) {
-               apic_printk(APIC_QUIET, KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
-                       "%d\n", ioapic, apic_id, reg_00.bits.ID);
-               apic_id = reg_00.bits.ID;
-       }
-
-       /*
-        * Every APIC in a system must have a unique ID or we get lots of nice 
-        * 'stuck on smp_invalidate_needed IPI wait' messages.
-        */
-       if (physid_isset(apic_id, apic_id_map)) {
-
-               for (i = 0; i < IO_APIC_MAX_ID; i++) {
-                       if (!physid_isset(i, apic_id_map))
-                               break;
-               }
-
-               if (i == IO_APIC_MAX_ID)
-                       panic("Max apic_id exceeded!\n");
-
-               apic_printk(APIC_VERBOSE, KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
-                       "trying %d\n", ioapic, apic_id, i);
-
-               apic_id = i;
-       } 
-
-       physid_set(apic_id, apic_id_map);
-
-       if (reg_00.bits.ID != apic_id) {
-               reg_00.bits.ID = apic_id;
-
-               spin_lock_irqsave(&ioapic_lock, flags);
-               io_apic_write(ioapic, 0, reg_00.raw);
-               reg_00.raw = io_apic_read(ioapic, 0);
-               spin_unlock_irqrestore(&ioapic_lock, flags);
-
-               /* Sanity check */
-               if (reg_00.bits.ID != apic_id)
-                       panic("IOAPIC[%d]: Unable change apic_id!\n", ioapic);
-       }
-
-       apic_printk(APIC_VERBOSE,KERN_INFO "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
-
-       return apic_id;
-}
-
-
 int __init io_apic_get_version (int ioapic)
 {
        union IO_APIC_reg_01    reg_01;

diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 7ec031c..f221231 100644 (file)
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -759,7 +759,7 @@ void __init mp_register_ioapic (
        mp_ioapics[idx].mpc_apicaddr = address;
 
        set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
-       mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
+       mp_ioapics[idx].mpc_apicid = id;
        mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
        
        /* 

diff --git a/include/asm-x86_64/io_apic.h b/include/asm-x86_64/io_apic.h
index 7efc932..3257374 100644 (file)
--- a/include/asm-x86_64/io_apic.h
+++ b/include/asm-x86_64/io_apic.h
@@ -202,7 +202,6 @@ extern int skip_ioapic_setup;
 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 
 #ifdef CONFIG_ACPI_BOOT
-extern int io_apic_get_unique_id (int ioapic, int apic_id);
 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);