Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull smp/hotplug changes from Ingo Molnar:
 "Various cleanups to the SMP hotplug code - a continuing effort of
  Thomas et al"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  smpboot: Remove leftover declaration
  smp: Remove num_booting_cpus()
  smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()
  POWERPC: Smp: remove call to ipi_call_lock()/ipi_call_unlock()
  SPARC: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq()
  ia64: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq()
  x86-smp-remove-call-to-ipi_call_lock-ipi_call_unlock
  tile: SMP: Remove call to ipi_call_lock()/ipi_call_unlock()
  S390: Smp: remove call to ipi_call_lock()/ipi_call_unlock()
  parisc: Smp: remove call to ipi_call_lock()/ipi_call_unlock()
  mn10300: SMP: Remove call to ipi_call_lock()/ipi_call_unlock()
  hexagon: SMP: Remove call to ipi_call_lock()/ipi_call_unlock()

12 files changed, 1 insertions, 49 deletions

diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
index f7264621e58d..149fbefc1a4d 100644
--- a/arch/hexagon/kernel/smp.c
+++ b/arch/hexagon/kernel/smp.c
@@ -180,9 +180,7 @@ void __cpuinit start_secondary(void)
 
         notify_cpu_starting(cpu);
 
-        ipi_call_lock();
         set_cpu_online(cpu, true);
-        ipi_call_unlock();
 
         local_irq_enable();
 
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 1113b8aba07f..963d2db53bfa 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -382,7 +382,6 @@ smp_callin (void)
         set_numa_node(cpu_to_node_map[cpuid]);
         set_numa_mem(local_memory_node(cpu_to_node_map[cpuid]));
 
-        ipi_call_lock_irq();
         spin_lock(&vector_lock);
         /* Setup the per cpu irq handling data structures */
         __setup_vector_irq(cpuid);
@@ -390,7 +389,6 @@ smp_callin (void)
         set_cpu_online(cpuid, true);
         per_cpu(cpu_state, cpuid) = CPU_ONLINE;
         spin_unlock(&vector_lock);
-        ipi_call_unlock_irq();
 
         smp_setup_percpu_timer();
 
diff --git a/arch/m32r/include/asm/smp.h b/arch/m32r/include/asm/smp.h
index cf7829a61551..c689b828dfe2 100644
--- a/arch/m32r/include/asm/smp.h
+++ b/arch/m32r/include/asm/smp.h
@@ -79,11 +79,6 @@ static __inline__ int cpu_number_map(int cpu)
         return cpu;
 }
 
-static __inline__ unsigned int num_booting_cpus(void)
-{
-        return cpumask_weight(&cpu_callout_map);
-}
-
 extern void smp_send_timer(void);
 extern unsigned long send_IPI_mask_phys(const cpumask_t*, int, int);
 
diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
index 090d35d36973..e62c223e4c45 100644
--- a/arch/mn10300/kernel/smp.c
+++ b/arch/mn10300/kernel/smp.c
@@ -876,9 +876,7 @@ static void __init smp_online(void)
 
         notify_cpu_starting(cpu);
 
-        ipi_call_lock();
         set_cpu_online(cpu, true);
-        ipi_call_unlock();
 
         local_irq_enable();
 }
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index a47828d31fe6..6266730efd61 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -300,9 +300,7 @@ smp_cpu_init(int cpunum)
 
         notify_cpu_starting(cpunum);
 
-        ipi_call_lock();
         set_cpu_online(cpunum, true);
-        ipi_call_unlock();
 
         /* Initialise the idle task for this CPU */
         atomic_inc(&init_mm.mm_count);
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index e4cb34322de4..e1417c42155c 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -571,7 +571,6 @@ void __devinit start_secondary(void *unused)
         if (system_state == SYSTEM_RUNNING)
                 vdso_data->processorCount++;
 #endif
-        ipi_call_lock();
         notify_cpu_starting(cpu);
         set_cpu_online(cpu, true);
         /* Update sibling maps */
@@ -601,7 +600,6 @@ void __devinit start_secondary(void *unused)
                 of_node_put(np);
         }
         of_node_put(l2_cache);
-        ipi_call_unlock();
 
         local_irq_enable();
 
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 15cca26ccb6c..8dca9c248ac7 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -717,9 +717,7 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
         init_cpu_vtimer();
         pfault_init();
         notify_cpu_starting(smp_processor_id());
-        ipi_call_lock();
         set_cpu_online(smp_processor_id(), true);
-        ipi_call_unlock();
         local_irq_enable();
         /* cpu_idle will call schedule for us */
         cpu_idle();
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index f591598d92f6..781bcb10b8bd 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -103,8 +103,6 @@ void __cpuinit smp_callin(void)
         if (cheetah_pcache_forced_on)
                 cheetah_enable_pcache();
 
-        local_irq_enable();
-
         callin_flag = 1;
         __asm__ __volatile__("membar #Sync\n\t"
                              "flush  %%g6" : : : "memory");
@@ -124,9 +122,8 @@ void __cpuinit smp_callin(void)
         while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
                 rmb();
 
-        ipi_call_lock_irq();
         set_cpu_online(cpuid, true);
-        ipi_call_unlock_irq();
+        local_irq_enable();
 
         /* idle thread is expected to have preempt disabled */
         preempt_disable();
@@ -1308,9 +1305,7 @@ int __cpu_disable(void)
         mdelay(1);
         local_irq_disable();
 
-        ipi_call_lock();
         set_cpu_online(cpu, false);
-        ipi_call_unlock();
 
         cpu_map_rebuild();
 
diff --git a/arch/tile/kernel/smpboot.c b/arch/tile/kernel/smpboot.c
index 84873fbe8f27..e686c5ac90be 100644
--- a/arch/tile/kernel/smpboot.c
+++ b/arch/tile/kernel/smpboot.c
@@ -198,17 +198,7 @@ void __cpuinit online_secondary(void)
 
         notify_cpu_starting(smp_processor_id());
 
-        /*
-         * We need to hold call_lock, so there is no inconsistency
-         * between the time smp_call_function() determines number of
-         * IPI recipients, and the time when the determination is made
-         * for which cpus receive the IPI. Holding this
-         * lock helps us to not include this cpu in a currently in progress
-         * smp_call_function().
-         */
-        ipi_call_lock();
         set_cpu_online(smp_processor_id(), 1);
-        ipi_call_unlock();
         __get_cpu_var(cpu_state) = CPU_ONLINE;
 
         /* Set up tile-specific state for this cpu. */
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index f48394513c37..2ffa95dc2333 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -169,11 +169,6 @@ void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 void smp_store_cpu_info(int id);
 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 
-/* We don't mark CPUs online until __cpu_up(), so we need another measure */
-static inline int num_booting_cpus(void)
-{
-        return cpumask_weight(cpu_callout_mask);
-}
 #else /* !CONFIG_SMP */
 #define wbinvd_on_cpu(cpu)     wbinvd()
 static inline int wbinvd_on_all_cpus(void)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7bd8a0823654..27e2eeff7a4b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -255,22 +255,13 @@ notrace static void __cpuinit start_secondary(void *unused)
         check_tsc_sync_target();
 
         /*
-         * We need to hold call_lock, so there is no inconsistency
-         * between the time smp_call_function() determines number of
-         * IPI recipients, and the time when the determination is made
-         * for which cpus receive the IPI. Holding this
-         * lock helps us to not include this cpu in a currently in progress
-         * smp_call_function().
-         *
          * We need to hold vector_lock so there the set of online cpus
          * does not change while we are assigning vectors to cpus.  Holding
          * this lock ensures we don't half assign or remove an irq from a cpu.
          */
-        ipi_call_lock();
         lock_vector_lock();
         set_cpu_online(smp_processor_id(), true);
         unlock_vector_lock();
-        ipi_call_unlock();
         per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
         x86_platform.nmi_init();
 
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index afb250d22a6b..f58dca7a6e52 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -80,9 +80,7 @@ static void __cpuinit cpu_bringup(void)
 
         notify_cpu_starting(cpu);
 
-        ipi_call_lock();
         set_cpu_online(cpu, true);
-        ipi_call_unlock();
 
         this_cpu_write(cpu_state, CPU_ONLINE);