[PATCH] x86: default to physical mode on hotplug CPU kernels

Default to physical mode on hotplug CPU kernels.  Furher simplify and clean up
the APIC initialization code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

13 files changed, 16 insertions, 26 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 9ea5b8ecc7e1..280898b045b2 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -874,7 +874,7 @@ static void __init acpi_process_madt(void)
                                 acpi_ioapic = 1;
 
                                 smp_found_config = 1;
-                                clustered_apic_check();
+                                setup_apic_routing();
                         }
                 }
                 if (error == -EINVAL) {
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index 4f5983c98669..0952eccd8f28 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -477,7 +477,7 @@ static int __init smp_read_mpc(struct mp_config_table *mpc)
                 }
                 ++mpc_record;
         }
-        clustered_apic_check();
+        setup_apic_routing();
         if (!num_processors)
                 printk(KERN_ERR "SMP mptable: no processors registered!\n");
         return num_processors;
diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c
index 025f26ebb8d7..c08650a427e2 100644
--- a/arch/x86_64/kernel/genapic.c
+++ b/arch/x86_64/kernel/genapic.c
@@ -35,11 +35,8 @@ struct genapic __read_mostly *genapic = &apic_flat;
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  */
-void __init clustered_apic_check(void)
+void __init setup_apic_routing(void)
 {
-        unsigned int i, max_apic = 0;
-        u8 id;
-
 #ifdef CONFIG_ACPI
         /*
          * Quirk: some x86_64 machines can only use physical APIC mode
@@ -49,17 +46,10 @@ void __init clustered_apic_check(void)
         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
                         (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
                 genapic = &apic_physflat;
+        else
 #endif
 
-        for (i = 0; i < NR_CPUS; i++) {
-                id = bios_cpu_apicid[i];
-                if (id == BAD_APICID)
-                        continue;
-                if (id > max_apic)
-                        max_apic = id;
-        }
-
-        if (max_apic < 8)
+        if (cpus_weight(cpu_possible_map) <= 8)
                 genapic = &apic_flat;
         else
                 genapic = &apic_physflat;
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 455aa0b932f0..d0dc4891599b 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -300,7 +300,7 @@ static int __init smp_read_mpc(struct mp_config_table *mpc)
                         }
                 }
         }
-        clustered_apic_check();
+        setup_apic_routing();
         if (!num_processors)
                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
         return num_processors;
diff --git a/include/asm-i386/genapic.h b/include/asm-i386/genapic.h
index 8ffbb0f07457..33e3ffe1766c 100644
--- a/include/asm-i386/genapic.h
+++ b/include/asm-i386/genapic.h
@@ -36,7 +36,7 @@ struct genapic {
         void (*init_apic_ldr)(void);
         physid_mask_t (*ioapic_phys_id_map)(physid_mask_t map);
 
-        void (*clustered_apic_check)(void);
+        void (*setup_apic_routing)(void);
         int (*multi_timer_check)(int apic, int irq);
         int (*apicid_to_node)(int logical_apicid); 
         int (*cpu_to_logical_apicid)(int cpu);
@@ -99,7 +99,7 @@ struct genapic {
         APICFUNC(check_apicid_present) \
         APICFUNC(init_apic_ldr) \
         APICFUNC(ioapic_phys_id_map) \
-        APICFUNC(clustered_apic_check) \
+        APICFUNC(setup_apic_routing) \
         APICFUNC(multi_timer_check) \
         APICFUNC(apicid_to_node) \
         APICFUNC(cpu_to_logical_apicid) \
diff --git a/include/asm-i386/mach-bigsmp/mach_apic.h b/include/asm-i386/mach-bigsmp/mach_apic.h
index 18b19a773440..ebd319f838ab 100644
--- a/include/asm-i386/mach-bigsmp/mach_apic.h
+++ b/include/asm-i386/mach-bigsmp/mach_apic.h
@@ -71,7 +71,7 @@ static inline void init_apic_ldr(void)
         apic_write_around(APIC_LDR, val);
 }
 
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
         printk("Enabling APIC mode:  %s.  Using %d I/O APICs\n",
                 "Physflat", nr_ioapics);
diff --git a/include/asm-i386/mach-default/mach_apic.h b/include/asm-i386/mach-default/mach_apic.h
index 3ef6292db780..6db1c3babe9a 100644
--- a/include/asm-i386/mach-default/mach_apic.h
+++ b/include/asm-i386/mach-default/mach_apic.h
@@ -54,7 +54,7 @@ static inline physid_mask_t ioapic_phys_id_map(physid_mask_t phys_map)
         return phys_map;
 }
 
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
         printk("Enabling APIC mode:  %s.  Using %d I/O APICs\n",
                                         "Flat", nr_ioapics);
diff --git a/include/asm-i386/mach-es7000/mach_apic.h b/include/asm-i386/mach-es7000/mach_apic.h
index 26333685a7fb..8e8b3949173a 100644
--- a/include/asm-i386/mach-es7000/mach_apic.h
+++ b/include/asm-i386/mach-es7000/mach_apic.h
@@ -81,7 +81,7 @@ static inline void enable_apic_mode(void)
 }
 
 extern int apic_version [MAX_APICS];
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
         int apic = bios_cpu_apicid[smp_processor_id()];
         printk("Enabling APIC mode:  %s.  Using %d I/O APICs, target cpus %lx\n",
diff --git a/include/asm-i386/mach-generic/mach_apic.h b/include/asm-i386/mach-generic/mach_apic.h
index d9dc039da94a..a236e7021528 100644
--- a/include/asm-i386/mach-generic/mach_apic.h
+++ b/include/asm-i386/mach-generic/mach_apic.h
@@ -13,7 +13,7 @@
 #define apic_id_registered (genapic->apic_id_registered)
 #define init_apic_ldr (genapic->init_apic_ldr)
 #define ioapic_phys_id_map (genapic->ioapic_phys_id_map)
-#define clustered_apic_check (genapic->clustered_apic_check) 
+#define setup_apic_routing (genapic->setup_apic_routing)
 #define multi_timer_check (genapic->multi_timer_check)
 #define apicid_to_node (genapic->apicid_to_node)
 #define cpu_to_logical_apicid (genapic->cpu_to_logical_apicid) 
diff --git a/include/asm-i386/mach-numaq/mach_apic.h b/include/asm-i386/mach-numaq/mach_apic.h
index 9d158095da82..5e5e7dd2692e 100644
--- a/include/asm-i386/mach-numaq/mach_apic.h
+++ b/include/asm-i386/mach-numaq/mach_apic.h
@@ -34,7 +34,7 @@ static inline void init_apic_ldr(void)
         /* Already done in NUMA-Q firmware */
 }
 
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
         printk("Enabling APIC mode:  %s.  Using %d I/O APICs\n",
                 "NUMA-Q", nr_ioapics);
diff --git a/include/asm-i386/mach-summit/mach_apic.h b/include/asm-i386/mach-summit/mach_apic.h
index 43e5bd8f4a19..732f776aab8e 100644
--- a/include/asm-i386/mach-summit/mach_apic.h
+++ b/include/asm-i386/mach-summit/mach_apic.h
@@ -80,7 +80,7 @@ static inline int apic_id_registered(void)
         return 1;
 }
 
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
         printk("Enabling APIC mode:  Summit.  Using %d I/O APICs\n",
                                                 nr_ioapics);
diff --git a/include/asm-i386/mach-visws/mach_apic.h b/include/asm-i386/mach-visws/mach_apic.h
index 18afe6b6fc4d..efac6f0d139f 100644
--- a/include/asm-i386/mach-visws/mach_apic.h
+++ b/include/asm-i386/mach-visws/mach_apic.h
@@ -47,7 +47,7 @@ static inline void summit_check(char *oem, char *productid)
 {
 }
 
-static inline void clustered_apic_check(void)
+static inline void setup_apic_routing(void)
 {
 }
 
diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h
index 7cfb39cbd918..2f3b013595ab 100644
--- a/include/asm-x86_64/apic.h
+++ b/include/asm-x86_64/apic.h
@@ -83,7 +83,7 @@ extern void setup_secondary_APIC_clock (void);
 extern int APIC_init_uniprocessor (void);
 extern void disable_APIC_timer(void);
 extern void enable_APIC_timer(void);
-extern void clustered_apic_check(void);
+extern void setup_apic_routing(void);
 
 extern void setup_APIC_extened_lvt(unsigned char lvt_off, unsigned char vector,
                                    unsigned char msg_type, unsigned char mask);