[PATCH] i386: Add smp_ops interface

Add a smp_ops interface.  This abstracts the API defined by
<linux/smp.h> for use within arch/i386.  The primary intent is that it
be used by a paravirtualizing hypervisor to implement SMP, but it
could also be used by non-APIC-using sub-architectures.

This is related to CONFIG_PARAVIRT, but is implemented unconditionally
since it is simpler that way and not a highly performance-sensitive
interface.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 20 insertions, 9 deletions

diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
index b90bebeb1c79..fe38b49a1223 100644
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -483,7 +483,7 @@ void flush_tlb_all(void)
  * it goes straight through and wastes no time serializing
  * anything. Worst case is that we lose a reschedule ...
  */
-void smp_send_reschedule(int cpu)
+void native_smp_send_reschedule(int cpu)
 {
         WARN_ON(cpu_is_offline(cpu));
         send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
@@ -560,9 +560,9 @@ static void __smp_call_function(void (*func) (void *info), void *info,
  * You must not call this function with disabled interrupts or from a
  * hardware interrupt handler or from a bottom half handler.
  */
-int smp_call_function_mask(cpumask_t mask,
-                           void (*func)(void *), void *info,
-                           int wait)
+int native_smp_call_function_mask(cpumask_t mask,
+                                  void (*func)(void *), void *info,
+                                  int wait)
 {
         struct call_data_struct data;
         cpumask_t allbutself;
@@ -681,7 +681,7 @@ static void stop_this_cpu (void * dummy)
  * this function calls the 'stop' function on all other CPUs in the system.
  */
 
-void smp_send_stop(void)
+void native_smp_send_stop(void)
 {
         /* Don't deadlock on the call lock in panic */
         int nolock = !spin_trylock(&call_lock);
@@ -757,3 +757,14 @@ int safe_smp_processor_id(void)
 
         return cpuid >= 0 ? cpuid : 0;
 }
+
+struct smp_ops smp_ops = {
+        .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
+        .smp_prepare_cpus = native_smp_prepare_cpus,
+        .cpu_up = native_cpu_up,
+        .smp_cpus_done = native_smp_cpus_done,
+
+        .smp_send_stop = native_smp_send_stop,
+        .smp_send_reschedule = native_smp_send_reschedule,
+        .smp_call_function_mask = native_smp_call_function_mask,
+};
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index b0ad04d9ef21..1c3ad9b406ca 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -1171,7 +1171,7 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
 
 /* These are wrappers to interface to the new boot process.  Someone
    who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init native_smp_prepare_cpus(unsigned int max_cpus)
 {
         smp_commenced_mask = cpumask_of_cpu(0);
         cpu_callin_map = cpumask_of_cpu(0);
@@ -1191,7 +1191,7 @@ static inline void switch_to_new_gdt(void)
         asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_PDA) : "memory");
 }
 
-void __init smp_prepare_boot_cpu(void)
+void __init native_smp_prepare_boot_cpu(void)
 {
         unsigned int cpu = smp_processor_id();
 
@@ -1292,7 +1292,7 @@ void __cpu_die(unsigned int cpu)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpuinit native_cpu_up(unsigned int cpu)
 {
         unsigned long flags;
 #ifdef CONFIG_HOTPLUG_CPU
@@ -1337,7 +1337,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
         return 0;
 }
 
-void __init smp_cpus_done(unsigned int max_cpus)
+void __init native_smp_cpus_done(unsigned int max_cpus)
 {
 #ifdef CONFIG_X86_IO_APIC
         setup_ioapic_dest();