[SPARC]: Try to start getting SMP back into shape.

Todo items:
 - IRQ_INPROGRESS flag - use sparc64 irq buckets, or generic irq_desc?
 - sun4d
 - re-indent large chunks of sun4m_smp.c
 - some places assume sequential cpu numbering (i.e. 0,1 instead of 0,2)

Last I checked (with 2.6.14), random programs segfault with dual
HyperSPARC.  And with SuperSPARC II's, it seems stable but will
eventually die from a write lock error (wrong lock owner or something).

I haven't tried the HyperSPARC + highmem combination recently, so that
may still be a problem.

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 185 insertions, 167 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index f944b58cdfe7..7c58fc1a39c4 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -23,7 +23,6 @@ menu "General machine setup"
 
 config SMP
         bool "Symmetric multi-processing support (does not work on sun4/sun4c)"
-        depends on BROKEN
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, say N. If you have a system with more
diff --git a/arch/sparc/kernel/irq.c b/arch/sparc/kernel/irq.c
index 4c60a6ef54a9..aac8af5aae51 100644
--- a/arch/sparc/kernel/irq.c
+++ b/arch/sparc/kernel/irq.c
@@ -154,9 +154,11 @@ void (*sparc_init_timers)(irqreturn_t (*)(int, void *,struct pt_regs *)) =
 struct irqaction static_irqaction[MAX_STATIC_ALLOC];
 int static_irq_count;
 
-struct irqaction *irq_action[NR_IRQS] = {
-        [0 ... (NR_IRQS-1)] = NULL
-};
+struct {
+        struct irqaction *action;
+        int flags;
+} sparc_irq[NR_IRQS];
+#define SPARC_IRQ_INPROGRESS 1
 
 /* Used to protect the IRQ action lists */
 DEFINE_SPINLOCK(irq_action_lock);
@@ -177,7 +179,7 @@ int show_interrupts(struct seq_file *p, void *v)
         }
         spin_lock_irqsave(&irq_action_lock, flags);
         if (i < NR_IRQS) {
-                action = *(i + irq_action);
+                action = sparc_irq[i].action;
                 if (!action) 
                         goto out_unlock;
                 seq_printf(p, "%3d: ", i);
@@ -186,7 +188,7 @@ int show_interrupts(struct seq_file *p, void *v)
 #else
                 for_each_online_cpu(j) {
                         seq_printf(p, "%10u ",
-                                    kstat_cpu(cpu_logical_map(j)).irqs[i]);
+                                    kstat_cpu(j).irqs[i]);
                 }
 #endif
                 seq_printf(p, " %c %s",
@@ -207,7 +209,7 @@ out_unlock:
 void free_irq(unsigned int irq, void *dev_id)
 {
         struct irqaction * action;
-        struct irqaction * tmp = NULL;
+        struct irqaction **actionp;
         unsigned long flags;
         unsigned int cpu_irq;
         
@@ -225,7 +227,8 @@ void free_irq(unsigned int irq, void *dev_id)
 
         spin_lock_irqsave(&irq_action_lock, flags);
 
-        action = *(cpu_irq + irq_action);
+        actionp = &sparc_irq[cpu_irq].action;
+        action = *actionp;
 
         if (!action->handler) {
                 printk("Trying to free free IRQ%d\n",irq);
@@ -235,7 +238,7 @@ void free_irq(unsigned int irq, void *dev_id)
                 for (; action; action = action->next) {
                         if (action->dev_id == dev_id)
                                 break;
-                        tmp = action;
+                        actionp = &action->next;
                 }
                 if (!action) {
                         printk("Trying to free free shared IRQ%d\n",irq);
@@ -254,11 +257,8 @@ void free_irq(unsigned int irq, void *dev_id)
                        irq, action->name);
                 goto out_unlock;
         }
-        
-        if (action && tmp)
-                tmp->next = action->next;
-        else
-                *(cpu_irq + irq_action) = action->next;
+
+        *actionp = action->next;
 
         spin_unlock_irqrestore(&irq_action_lock, flags);
 
@@ -268,7 +268,7 @@ void free_irq(unsigned int irq, void *dev_id)
 
         kfree(action);
 
-        if (!(*(cpu_irq + irq_action)))
+        if (!sparc_irq[cpu_irq].action)
                 disable_irq(irq);
 
 out_unlock:
@@ -287,8 +287,11 @@ EXPORT_SYMBOL(free_irq);
 #ifdef CONFIG_SMP
 void synchronize_irq(unsigned int irq)
 {
-        printk("synchronize_irq says: implement me!\n");
-        BUG();
+        unsigned int cpu_irq;
+
+        cpu_irq = irq & (NR_IRQS - 1);
+        while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
+                cpu_relax();
 }
 #endif /* SMP */
 
@@ -299,7 +302,7 @@ void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
         unsigned int cpu_irq;
         
         cpu_irq = irq & (NR_IRQS - 1);
-        action = *(cpu_irq + irq_action);
+        action = sparc_irq[cpu_irq].action;
 
         printk("IO device interrupt, irq = %d\n", irq);
         printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc, 
@@ -330,7 +333,8 @@ void handler_irq(int irq, struct pt_regs * regs)
         if(irq < 10)
                 smp4m_irq_rotate(cpu);
 #endif
-        action = *(irq + irq_action);
+        action = sparc_irq[irq].action;
+        sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
         kstat_cpu(cpu).irqs[irq]++;
         do {
                 if (!action || !action->handler)
@@ -338,6 +342,7 @@ void handler_irq(int irq, struct pt_regs * regs)
                 action->handler(irq, action->dev_id, regs);
                 action = action->next;
         } while (action);
+        sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
         enable_pil_irq(irq);
         irq_exit();
 }
@@ -389,7 +394,7 @@ int request_fast_irq(unsigned int irq,
 
         spin_lock_irqsave(&irq_action_lock, flags);
 
-        action = *(cpu_irq + irq_action);
+        action = sparc_irq[cpu_irq].action;
         if(action) {
                 if(action->flags & SA_SHIRQ)
                         panic("Trying to register fast irq when already shared.\n");
@@ -452,7 +457,7 @@ int request_fast_irq(unsigned int irq,
         action->dev_id = NULL;
         action->next = NULL;
 
-        *(cpu_irq + irq_action) = action;
+        sparc_irq[cpu_irq].action = action;
 
         enable_irq(irq);
 
@@ -467,7 +472,7 @@ int request_irq(unsigned int irq,
                 irqreturn_t (*handler)(int, void *, struct pt_regs *),
                 unsigned long irqflags, const char * devname, void *dev_id)
 {
-        struct irqaction * action, *tmp = NULL;
+        struct irqaction * action, **actionp;
         unsigned long flags;
         unsigned int cpu_irq;
         int ret;
@@ -490,20 +495,20 @@ int request_irq(unsigned int irq,
             
         spin_lock_irqsave(&irq_action_lock, flags);
 
-        action = *(cpu_irq + irq_action);
+        actionp = &sparc_irq[cpu_irq].action;
+        action = *actionp;
         if (action) {
-                if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
-                        for (tmp = action; tmp->next; tmp = tmp->next);
-                } else {
+                if (!(action->flags & SA_SHIRQ) || !(irqflags & SA_SHIRQ)) {
                         ret = -EBUSY;
                         goto out_unlock;
                 }
-                if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
+                if ((action->flags & SA_INTERRUPT) != (irqflags & SA_INTERRUPT)) {
                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
                         ret = -EBUSY;
                         goto out_unlock;
-                }   
-                action = NULL;          /* Or else! */
+                }
+                for ( ; action; action = *actionp)
+                        actionp = &action->next;
         }
 
         /* If this is flagged as statically allocated then we use our
@@ -532,10 +537,7 @@ int request_irq(unsigned int irq,
         action->next = NULL;
         action->dev_id = dev_id;
 
-        if (tmp)
-                tmp->next = action;
-        else
-                *(cpu_irq + irq_action) = action;
+        *actionp = action;
 
         enable_irq(irq);
 
diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c
index ea5682ce7031..2be812115197 100644
--- a/arch/sparc/kernel/smp.c
+++ b/arch/sparc/kernel/smp.c
@@ -45,6 +45,7 @@ volatile int __cpu_logical_map[NR_CPUS];
 
 cpumask_t cpu_online_map = CPU_MASK_NONE;
 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 
 /* The only guaranteed locking primitive available on all Sparc
  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
@@ -57,11 +58,6 @@ cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
 /* Used to make bitops atomic */
 unsigned char bitops_spinlock = 0;
 
-volatile unsigned long ipi_count;
-
-volatile int smp_process_available=0;
-volatile int smp_commenced = 0;
-
 void __init smp_store_cpu_info(int id)
 {
         int cpu_node;
@@ -79,6 +75,22 @@ void __init smp_store_cpu_info(int id)
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
+        extern void smp4m_smp_done(void);
+        unsigned long bogosum = 0;
+        int cpu, num;
+
+        for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
+                if (cpu_online(cpu)) {
+                        num++;
+                        bogosum += cpu_data(cpu).udelay_val;
+                }
+
+        printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+                num, bogosum/(500000/HZ),
+                (bogosum/(5000/HZ))%100);
+
+        BUG_ON(sparc_cpu_model != sun4m);
+        smp4m_smp_done();
 }
 
 void cpu_panic(void)
@@ -89,17 +101,6 @@ void cpu_panic(void)
 
 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
 
-void __init smp_boot_cpus(void)
-{
-        extern void smp4m_boot_cpus(void);
-        extern void smp4d_boot_cpus(void);
-        
-        if (sparc_cpu_model == sun4m)
-                smp4m_boot_cpus();
-        else
-                smp4d_boot_cpus();
-}
-
 void smp_send_reschedule(int cpu)
 {
         /* See sparc64 */
@@ -252,20 +253,61 @@ int setup_profiling_timer(unsigned int multiplier)
         return 0;
 }
 
-void __init smp_prepare_cpus(unsigned int maxcpus)
+void __init smp_prepare_cpus(unsigned int max_cpus)
 {
+        extern void smp4m_boot_cpus(void);
+        int i, cpuid, ncpus, extra;
+
+        BUG_ON(sparc_cpu_model != sun4m);
+        printk("Entering SMP Mode...\n");
+
+        ncpus = 1;
+        extra = 0;
+        for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
+                if (cpuid == boot_cpu_id)
+                        continue;
+                if (cpuid < NR_CPUS && ncpus++ < max_cpus)
+                        cpu_set(cpuid, phys_cpu_present_map);
+                else
+                        extra++;
+        }
+        if (max_cpus >= NR_CPUS && extra)
+                printk("Warning: NR_CPUS is too low to start all cpus\n");
+
+        smp_store_cpu_info(boot_cpu_id);
+
+        smp4m_boot_cpus();
 }
 
 void __devinit smp_prepare_boot_cpu(void)
 {
-        current_thread_info()->cpu = hard_smp_processor_id();
-        cpu_set(smp_processor_id(), cpu_online_map);
-        cpu_set(smp_processor_id(), phys_cpu_present_map);
+        int cpuid = hard_smp_processor_id();
+
+        if (cpuid >= NR_CPUS) {
+                prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
+                prom_halt();
+        }
+        if (cpuid != 0)
+                printk("boot cpu id != 0, this could work but is untested\n");
+
+        current_thread_info()->cpu = cpuid;
+        cpu_set(cpuid, cpu_online_map);
+        cpu_set(cpuid, phys_cpu_present_map);
 }
 
 int __devinit __cpu_up(unsigned int cpu)
 {
-        panic("smp doesn't work\n");
+        extern int smp4m_boot_one_cpu(int);
+        int ret;
+
+        ret = smp4m_boot_one_cpu(cpu);
+
+        if (!ret) {
+                cpu_set(cpu, smp_commenced_mask);
+                while (!cpu_online(cpu))
+                        mb();
+        }
+        return ret;
 }
 
 void smp_bogo(struct seq_file *m)
diff --git a/arch/sparc/kernel/sparc_ksyms.c b/arch/sparc/kernel/sparc_ksyms.c
index 19b25399d7e4..2c21d7907635 100644
--- a/arch/sparc/kernel/sparc_ksyms.c
+++ b/arch/sparc/kernel/sparc_ksyms.c
@@ -136,10 +136,6 @@ EXPORT_PER_CPU_SYMBOL(__cpu_data);
 /* IRQ implementation. */
 EXPORT_SYMBOL(synchronize_irq);
 
-/* Misc SMP information */
-EXPORT_SYMBOL(__cpu_number_map);
-EXPORT_SYMBOL(__cpu_logical_map);
-
 /* CPU online map and active count. */
 EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(phys_cpu_present_map);
diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
index cea7fc6fc6e5..ca656d9bd6fd 100644
--- a/arch/sparc/kernel/sun4d_irq.c
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -54,7 +54,7 @@ unsigned char cpu_leds[32];
 unsigned char sbus_tid[32];
 #endif
 
-extern struct irqaction *irq_action[];
+static struct irqaction *irq_action[NR_IRQS];
 extern spinlock_t irq_action_lock;
 
 struct sbus_action {
diff --git a/arch/sparc/kernel/sun4d_smp.c b/arch/sparc/kernel/sun4d_smp.c
index 41bb9596be48..b141b7ee6717 100644
--- a/arch/sparc/kernel/sun4d_smp.c
+++ b/arch/sparc/kernel/sun4d_smp.c
@@ -46,14 +46,16 @@ extern volatile int smp_processors_ready;
 extern int smp_num_cpus;
 static int smp_highest_cpu;
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
-extern struct cpuinfo_sparc cpu_data[NR_CPUS];
+extern cpuinfo_sparc cpu_data[NR_CPUS];
 extern unsigned char boot_cpu_id;
 extern int smp_activated;
 extern volatile int __cpu_number_map[NR_CPUS];
 extern volatile int __cpu_logical_map[NR_CPUS];
 extern volatile unsigned long ipi_count;
 extern volatile int smp_process_available;
-extern volatile int smp_commenced;
+
+extern cpumask_t smp_commenced_mask;
+
 extern int __smp4d_processor_id(void);
 
 /* #define SMP_DEBUG */
@@ -136,7 +138,7 @@ void __init smp4d_callin(void)
         
         local_irq_enable();     /* We don't allow PIL 14 yet */
         
-        while(!smp_commenced)
+        while (!cpu_isset(cpuid, smp_commenced_mask))
                 barrier();
 
         spin_lock_irqsave(&sun4d_imsk_lock, flags);
diff --git a/arch/sparc/kernel/sun4m_smp.c b/arch/sparc/kernel/sun4m_smp.c
index 1dde312eebda..70b375a4c2c2 100644
--- a/arch/sparc/kernel/sun4m_smp.c
+++ b/arch/sparc/kernel/sun4m_smp.c
@@ -40,15 +40,11 @@ extern ctxd_t *srmmu_ctx_table_phys;
 extern void calibrate_delay(void);
 
 extern volatile int smp_processors_ready;
-extern int smp_num_cpus;
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
 extern unsigned char boot_cpu_id;
-extern int smp_activated;
-extern volatile int __cpu_number_map[NR_CPUS];
-extern volatile int __cpu_logical_map[NR_CPUS];
-extern volatile unsigned long ipi_count;
-extern volatile int smp_process_available;
-extern volatile int smp_commenced;
+
+extern cpumask_t smp_commenced_mask;
+
 extern int __smp4m_processor_id(void);
 
 /*#define SMP_DEBUG*/
@@ -77,8 +73,6 @@ void __init smp4m_callin(void)
         local_flush_cache_all();
         local_flush_tlb_all();
 
-        set_irq_udt(boot_cpu_id);
-
         /* Get our local ticker going. */
         smp_setup_percpu_timer();
 
@@ -95,8 +89,9 @@ void __init smp4m_callin(void)
          * to call the scheduler code.
          */
         /* Allow master to continue. */
-        swap((unsigned long *)&cpu_callin_map[cpuid], 1);
+        swap(&cpu_callin_map[cpuid], 1);
 
+        /* XXX: What's up with all the flushes? */
         local_flush_cache_all();
         local_flush_tlb_all();
         
@@ -111,13 +106,14 @@ void __init smp4m_callin(void)
         atomic_inc(&init_mm.mm_count);
         current->active_mm = &init_mm;
 
-        while(!smp_commenced)
-                barrier();
-
-        local_flush_cache_all();
-        local_flush_tlb_all();
+        while (!cpu_isset(cpuid, smp_commenced_mask))
+                mb();
 
         local_irq_enable();
+
+        cpu_set(cpuid, cpu_online_map);
+        /* last one in gets all the interrupts (for testing) */
+        set_irq_udt(boot_cpu_id);
 }
 
 extern void init_IRQ(void);
@@ -134,102 +130,76 @@ extern unsigned long trapbase_cpu3[];
 
 void __init smp4m_boot_cpus(void)
 {
-        int cpucount = 0;
-        int i, mid;
+        smp_setup_percpu_timer();
+        local_flush_cache_all();
+}
 
-        printk("Entering SMP Mode...\n");
+int smp4m_boot_one_cpu(int i)
+{
+        extern unsigned long sun4m_cpu_startup;
+        unsigned long *entry = &sun4m_cpu_startup;
+        struct task_struct *p;
+        int timeout;
+        int cpu_node;
 
-        local_irq_enable();
-        cpus_clear(cpu_present_map);
+        cpu_find_by_mid(i, &cpu_node);
+
+        /* Cook up an idler for this guy. */
+        p = fork_idle(i);
+        current_set[i] = task_thread_info(p);
+        /* See trampoline.S for details... */
+        entry += ((i-1) * 3);
 
-        for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
-                cpu_set(mid, cpu_present_map);
+        /*
+         * Initialize the contexts table
+         * Since the call to prom_startcpu() trashes the structure,
+         * we need to re-initialize it for each cpu
+         */
+        smp_penguin_ctable.which_io = 0;
+        smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
+        smp_penguin_ctable.reg_size = 0;
 
-        for(i=0; i < NR_CPUS; i++) {
-                __cpu_number_map[i] = -1;
-                __cpu_logical_map[i] = -1;
+        /* whirrr, whirrr, whirrrrrrrrr... */
+        printk("Starting CPU %d at %p\n", i, entry);
+        local_flush_cache_all();
+        prom_startcpu(cpu_node,
+                      &smp_penguin_ctable, 0, (char *)entry);
+
+        /* wheee... it's going... */
+        for(timeout = 0; timeout < 10000; timeout++) {
+                if(cpu_callin_map[i])
+                        break;
+                udelay(200);
         }
 
-        __cpu_number_map[boot_cpu_id] = 0;
-        __cpu_logical_map[0] = boot_cpu_id;
-        current_thread_info()->cpu = boot_cpu_id;
+        if (!(cpu_callin_map[i])) {
+                printk("Processor %d is stuck.\n", i);
+                return -ENODEV;
+        }
 
-        smp_store_cpu_info(boot_cpu_id);
-        set_irq_udt(boot_cpu_id);
-        smp_setup_percpu_timer();
         local_flush_cache_all();
-        if(cpu_find_by_instance(1, NULL, NULL))
-                return;  /* Not an MP box. */
-        for(i = 0; i < NR_CPUS; i++) {
-                if(i == boot_cpu_id)
-                        continue;
-
-                if (cpu_isset(i, cpu_present_map)) {
-                        extern unsigned long sun4m_cpu_startup;
-                        unsigned long *entry = &sun4m_cpu_startup;
-                        struct task_struct *p;
-                        int timeout;
-
-                        /* Cook up an idler for this guy. */
-                        p = fork_idle(i);
-                        cpucount++;
-                        current_set[i] = task_thread_info(p);
-                        /* See trampoline.S for details... */
-                        entry += ((i-1) * 3);
-
-                        /*
-                         * Initialize the contexts table
-                         * Since the call to prom_startcpu() trashes the structure,
-                         * we need to re-initialize it for each cpu
-                         */
-                        smp_penguin_ctable.which_io = 0;
-                        smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
-                        smp_penguin_ctable.reg_size = 0;
-
-                        /* whirrr, whirrr, whirrrrrrrrr... */
-                        printk("Starting CPU %d at %p\n", i, entry);
-                        local_flush_cache_all();
-                        prom_startcpu(cpu_data(i).prom_node,
-                                      &smp_penguin_ctable, 0, (char *)entry);
-
-                        /* wheee... it's going... */
-                        for(timeout = 0; timeout < 10000; timeout++) {
-                                if(cpu_callin_map[i])
-                                        break;
-                                udelay(200);
-                        }
-                        if(cpu_callin_map[i]) {
-                                /* Another "Red Snapper". */
-                                __cpu_number_map[i] = i;
-                                __cpu_logical_map[i] = i;
-                        } else {
-                                cpucount--;
-                                printk("Processor %d is stuck.\n", i);
-                        }
-                }
-                if(!(cpu_callin_map[i])) {
-                        cpu_clear(i, cpu_present_map);
-                        __cpu_number_map[i] = -1;
+        return 0;
+}
+
+void __init smp4m_smp_done(void)
+{
+        int i, first;
+        int *prev;
+
+        /* setup cpu list for irq rotation */
+        first = 0;
+        prev = &first;
+        for (i = 0; i < NR_CPUS; i++) {
+                if (cpu_online(i)) {
+                        *prev = i;
+                        prev = &cpu_data(i).next;
                 }
         }
+        *prev = first;
         local_flush_cache_all();
-        if(cpucount == 0) {
-                printk("Error: only one Processor found.\n");
-                cpu_present_map = cpumask_of_cpu(smp_processor_id());
-        } else {
-                unsigned long bogosum = 0;
-                for_each_present_cpu(i)
-                        bogosum += cpu_data(i).udelay_val;
-                printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
-                       cpucount + 1,
-                       bogosum/(500000/HZ),
-                       (bogosum/(5000/HZ))%100);
-                smp_activated = 1;
-                smp_num_cpus = cpucount + 1;
-        }
 
         /* Free unneeded trap tables */
-        if (!cpu_isset(i, cpu_present_map)) {
+        if (!cpu_isset(1, cpu_present_map)) {
                 ClearPageReserved(virt_to_page(trapbase_cpu1));
                 init_page_count(virt_to_page(trapbase_cpu1));
                 free_page((unsigned long)trapbase_cpu1);
@@ -263,6 +233,9 @@ void __init smp4m_boot_cpus(void)
  */
 void smp4m_irq_rotate(int cpu)
 {
+        int next = cpu_data(cpu).next;
+        if (next != cpu)
+                set_irq_udt(next);
 }
 
 /* Cross calls, in order to work efficiently and atomically do all
@@ -289,7 +262,7 @@ void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 
         smp_cpu_in_msg[me]++;
         if(target == MSG_ALL_BUT_SELF || target == MSG_ALL) {
-                mask = cpu_present_map;
+                mask = cpu_online_map;
                 if(target == MSG_ALL_BUT_SELF)
                         cpu_clear(me, mask);
                 for(i = 0; i < 4; i++) {
@@ -314,8 +287,8 @@ static struct smp_funcall {
         unsigned long arg3;
         unsigned long arg4;
         unsigned long arg5;
-        unsigned long processors_in[NR_CPUS];  /* Set when ipi entered. */
-        unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
+        unsigned long processors_in[SUN4M_NCPUS];  /* Set when ipi entered. */
+        unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
 } ccall_info;
 
 static DEFINE_SPINLOCK(cross_call_lock);
@@ -324,8 +297,7 @@ static DEFINE_SPINLOCK(cross_call_lock);
 void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 {
-        if(smp_processors_ready) {
-                register int ncpus = smp_num_cpus;
+                register int ncpus = SUN4M_NCPUS;
                 unsigned long flags;
 
                 spin_lock_irqsave(&cross_call_lock, flags);
@@ -340,7 +312,7 @@ void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 
                 /* Init receive/complete mapping, plus fire the IPI's off. */
                 {
-                        cpumask_t mask = cpu_present_map;
+                        cpumask_t mask = cpu_online_map;
                         register int i;
 
                         cpu_clear(smp_processor_id(), mask);
@@ -373,7 +345,6 @@ void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
                 }
 
                 spin_unlock_irqrestore(&cross_call_lock, flags);
-        }
 }
 
 /* Running cross calls. */
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 27b0e0ba8581..58c65cc8d0d3 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -1302,7 +1302,12 @@ void __init srmmu_paging_init(void)
 
         flush_cache_all();
         srmmu_set_ctable_ptr((unsigned long)srmmu_ctx_table_phys);
+#ifdef CONFIG_SMP
+        /* Stop from hanging here... */
+        local_flush_tlb_all();
+#else
         flush_tlb_all();
+#endif
         poke_srmmu();
 
 #ifdef CONFIG_SUN_IO
@@ -1419,6 +1424,7 @@ static void __init init_vac_layout(void)
                                 max_size = vac_cache_size;
                         if(vac_line_size < min_line_size)
                                 min_line_size = vac_line_size;
+                        //FIXME: cpus not contiguous!!
                         cpu++;
                         if (cpu >= NR_CPUS || !cpu_online(cpu))
                                 break;