[PATCH] i386: Allow to use GENERICARCH for UP kernels

There are some machines around (large xSeries or Unisys ES7000) that
need physical IO-APIC destination mode to access all of their IO
devices. This currently doesn't work in UP kernels as used in
distribution installers.

This patch allows to compile even UP kernels as GENERICARCH which
allows to use physical or clustered APIC mode.

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 41 insertions, 28 deletions

diff --git a/include/asm-i386/genapic.h b/include/asm-i386/genapic.h
index b3783a32abee..8ffbb0f07457 100644
--- a/include/asm-i386/genapic.h
+++ b/include/asm-i386/genapic.h
@@ -1,6 +1,8 @@
 #ifndef _ASM_GENAPIC_H
 #define _ASM_GENAPIC_H 1
 
+#include <asm/mpspec.h>
+
 /*
  * Generic APIC driver interface.
  *
@@ -63,14 +65,25 @@ struct genapic {
         unsigned (*get_apic_id)(unsigned long x);
         unsigned long apic_id_mask;
         unsigned int (*cpu_mask_to_apicid)(cpumask_t cpumask);
-        
+
+#ifdef CONFIG_SMP
         /* ipi */
         void (*send_IPI_mask)(cpumask_t mask, int vector);
         void (*send_IPI_allbutself)(int vector);
         void (*send_IPI_all)(int vector);
+#endif
 }; 
 
-#define APICFUNC(x) .x = x
+#define APICFUNC(x) .x = x,
+
+/* More functions could be probably marked IPIFUNC and save some space
+   in UP GENERICARCH kernels, but I don't have the nerve right now
+   to untangle this mess. -AK  */
+#ifdef CONFIG_SMP
+#define IPIFUNC(x) APICFUNC(x)
+#else
+#define IPIFUNC(x)
+#endif
 
 #define APIC_INIT(aname, aprobe) { \
         .name = aname, \
@@ -80,33 +93,33 @@ struct genapic {
         .no_balance_irq = NO_BALANCE_IRQ, \
         .ESR_DISABLE = esr_disable, \
         .apic_destination_logical = APIC_DEST_LOGICAL, \
-        APICFUNC(apic_id_registered), \
-        APICFUNC(target_cpus), \
-        APICFUNC(check_apicid_used), \
-        APICFUNC(check_apicid_present), \
-        APICFUNC(init_apic_ldr), \
-        APICFUNC(ioapic_phys_id_map), \
-        APICFUNC(clustered_apic_check), \
-        APICFUNC(multi_timer_check), \
-        APICFUNC(apicid_to_node), \
-        APICFUNC(cpu_to_logical_apicid), \
-        APICFUNC(cpu_present_to_apicid), \
-        APICFUNC(apicid_to_cpu_present), \
-        APICFUNC(mpc_apic_id), \
-        APICFUNC(setup_portio_remap), \
-        APICFUNC(check_phys_apicid_present), \
-        APICFUNC(mpc_oem_bus_info), \
-        APICFUNC(mpc_oem_pci_bus), \
-        APICFUNC(mps_oem_check), \
-        APICFUNC(get_apic_id), \
+        APICFUNC(apic_id_registered) \
+        APICFUNC(target_cpus) \
+        APICFUNC(check_apicid_used) \
+        APICFUNC(check_apicid_present) \
+        APICFUNC(init_apic_ldr) \
+        APICFUNC(ioapic_phys_id_map) \
+        APICFUNC(clustered_apic_check) \
+        APICFUNC(multi_timer_check) \
+        APICFUNC(apicid_to_node) \
+        APICFUNC(cpu_to_logical_apicid) \
+        APICFUNC(cpu_present_to_apicid) \
+        APICFUNC(apicid_to_cpu_present) \
+        APICFUNC(mpc_apic_id) \
+        APICFUNC(setup_portio_remap) \
+        APICFUNC(check_phys_apicid_present) \
+        APICFUNC(mpc_oem_bus_info) \
+        APICFUNC(mpc_oem_pci_bus) \
+        APICFUNC(mps_oem_check) \
+        APICFUNC(get_apic_id) \
         .apic_id_mask = APIC_ID_MASK, \
-        APICFUNC(cpu_mask_to_apicid), \
-        APICFUNC(acpi_madt_oem_check), \
-        APICFUNC(send_IPI_mask), \
-        APICFUNC(send_IPI_allbutself), \
-        APICFUNC(send_IPI_all), \
-        APICFUNC(enable_apic_mode), \
-        APICFUNC(phys_pkg_id), \
+        APICFUNC(cpu_mask_to_apicid) \
+        APICFUNC(acpi_madt_oem_check) \
+        IPIFUNC(send_IPI_mask) \
+        IPIFUNC(send_IPI_allbutself) \
+        IPIFUNC(send_IPI_all) \
+        APICFUNC(enable_apic_mode) \
+        APICFUNC(phys_pkg_id) \
         }
 
 extern struct genapic *genapic;