[SPARC64]: Fix build regressions added by dr-cpu changes.

Do not select HOTPLUG_CPU from SUN_LDOMS, that causes
HOTPLUG_CPU to be selected even on non-SMP which is
illegal.

Only build hvtramp.o when SMP, just like trampoline.o

Protect dr-cpu code in ds.c with HOTPLUG_CPU.

Likewise move ldom_startcpu_cpuid() to smp.c and protect
it and the call site with SUN_LDOMS && HOTPLUG_CPU.

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

arch/sparc64/Kconfig

@@ -316,7 +316,6 @@ config SUN_IO
 
 config SUN_LDOMS
 	bool "Sun Logical Domains support"
-	select HOTPLUG_CPU
 	help
 	  Say Y here is you want to support virtual devices via
 	  Logical Domains.

arch/sparc64/kernel/Makefile

@@ -12,14 +12,13 @@ obj-y		:= process.o setup.o cpu.o idprom.o \
 		   irq.o ptrace.o time.o sys_sparc.o signal.o \
 		   unaligned.o central.o pci.o starfire.o semaphore.o \
 		   power.o sbus.o iommu_common.o sparc64_ksyms.o chmc.o \
-		   visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o \
-		   hvtramp.o
+		   visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o
 
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
 obj-$(CONFIG_PCI)	 += ebus.o isa.o pci_common.o pci_iommu.o \
 			    pci_psycho.o pci_sabre.o pci_schizo.o \
 			    pci_sun4v.o pci_sun4v_asm.o pci_fire.o
-obj-$(CONFIG_SMP)	 += smp.o trampoline.o
+obj-$(CONFIG_SMP)	 += smp.o trampoline.o hvtramp.o
 obj-$(CONFIG_SPARC32_COMPAT) += sys32.o sys_sparc32.o signal32.o
 obj-$(CONFIG_BINFMT_ELF32) += binfmt_elf32.o
 obj-$(CONFIG_BINFMT_AOUT32) += binfmt_aout32.o

arch/sparc64/kernel/ds.c

@@ -148,9 +148,11 @@ static void domain_shutdown_data(struct ldc_channel *lp,
 static void domain_panic_data(struct ldc_channel *lp,
 			      struct ds_cap_state *cp,
 			      void *buf, int len);
+#ifdef CONFIG_HOTPLUG_CPU
 static void dr_cpu_data(struct ldc_channel *lp,
 			struct ds_cap_state *cp,
 			void *buf, int len);
+#endif
 static void ds_pri_data(struct ldc_channel *lp,
 			struct ds_cap_state *cp,
 			void *buf, int len);
@@ -171,10 +173,12 @@ struct ds_cap_state ds_states[] = {
 		.service_id	= "domain-panic",
 		.data		= domain_panic_data,
 	},
+#ifdef CONFIG_HOTPLUG_CPU
 	{
 		.service_id	= "dr-cpu",
 		.data		= dr_cpu_data,
 	},
+#endif
 	{
 		.service_id	= "pri",
 		.data		= ds_pri_data,
@@ -355,6 +359,7 @@ static void domain_panic_data(struct ldc_channel *lp,
 	panic("PANIC requested by LDOM manager.");
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 struct dr_cpu_tag {
 	__u64				req_num;
 	__u32				type;
@@ -395,54 +400,6 @@ static unsigned long kimage_addr_to_ra(void *p)
 	return kern_base + (val - KERNBASE);
 }
 
-void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
-{
-	extern unsigned long sparc64_ttable_tl0;
-	extern unsigned long kern_locked_tte_data;
-	extern int bigkernel;
-	struct hvtramp_descr *hdesc;
-	unsigned long trampoline_ra;
-	struct trap_per_cpu *tb;
-	u64 tte_vaddr, tte_data;
-	unsigned long hv_err;
-
-	hdesc = kzalloc(sizeof(*hdesc), GFP_KERNEL);
-	if (!hdesc) {
-		printk(KERN_ERR PFX "ldom_startcpu_cpuid: Cannot allocate "
-		       "hvtramp_descr.\n");
-		return;
-	}
-
-	hdesc->cpu = cpu;
-	hdesc->num_mappings = (bigkernel ? 2 : 1);
-
-	tb = &trap_block[cpu];
-	tb->hdesc = hdesc;
-
-	hdesc->fault_info_va = (unsigned long) &tb->fault_info;
-	hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
-
-	hdesc->thread_reg = thread_reg;
-
-	tte_vaddr = (unsigned long) KERNBASE;
-	tte_data = kern_locked_tte_data;
-
-	hdesc->maps[0].vaddr = tte_vaddr;
-	hdesc->maps[0].tte   = tte_data;
-	if (bigkernel) {
-		tte_vaddr += 0x400000;
-		tte_data  += 0x400000;
-		hdesc->maps[1].vaddr = tte_vaddr;
-		hdesc->maps[1].tte   = tte_data;
-	}
-
-	trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
-
-	hv_err = sun4v_cpu_start(cpu, trampoline_ra,
-				 kimage_addr_to_ra(&sparc64_ttable_tl0),
-				 __pa(hdesc));
-}
-
 /* DR cpu requests get queued onto the work list by the
  * dr_cpu_data() callback.  The list is protected by
  * ds_lock, and processed by dr_cpu_process() in order.
@@ -704,6 +661,7 @@ static void dr_cpu_data(struct ldc_channel *lp,
 		schedule_work(&dr_cpu_work);
 	}
 }
+#endif
 
 struct ds_pri_msg {
 	__u64				req_num;

arch/sparc64/kernel/smp.c

@@ -281,6 +281,56 @@ static void smp_synchronize_one_tick(int cpu)
 	spin_unlock_irqrestore(&itc_sync_lock, flags);
 }
 
+#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
+static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
+{
+	extern unsigned long sparc64_ttable_tl0;
+	extern unsigned long kern_locked_tte_data;
+	extern int bigkernel;
+	struct hvtramp_descr *hdesc;
+	unsigned long trampoline_ra;
+	struct trap_per_cpu *tb;
+	u64 tte_vaddr, tte_data;
+	unsigned long hv_err;
+
+	hdesc = kzalloc(sizeof(*hdesc), GFP_KERNEL);
+	if (!hdesc) {
+		printk(KERN_ERR PFX "ldom_startcpu_cpuid: Cannot allocate "
+		       "hvtramp_descr.\n");
+		return;
+	}
+
+	hdesc->cpu = cpu;
+	hdesc->num_mappings = (bigkernel ? 2 : 1);
+
+	tb = &trap_block[cpu];
+	tb->hdesc = hdesc;
+
+	hdesc->fault_info_va = (unsigned long) &tb->fault_info;
+	hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
+
+	hdesc->thread_reg = thread_reg;
+
+	tte_vaddr = (unsigned long) KERNBASE;
+	tte_data = kern_locked_tte_data;
+
+	hdesc->maps[0].vaddr = tte_vaddr;
+	hdesc->maps[0].tte   = tte_data;
+	if (bigkernel) {
+		tte_vaddr += 0x400000;
+		tte_data  += 0x400000;
+		hdesc->maps[1].vaddr = tte_vaddr;
+		hdesc->maps[1].tte   = tte_data;
+	}
+
+	trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
+
+	hv_err = sun4v_cpu_start(cpu, trampoline_ra,
+				 kimage_addr_to_ra(&sparc64_ttable_tl0),
+				 __pa(hdesc));
+}
+#endif
+
 extern void sun4v_init_mondo_queues(int use_bootmem, int cpu, int alloc, int load);
 
 extern unsigned long sparc64_cpu_startup;
@@ -309,7 +359,7 @@ static int __devinit smp_boot_one_cpu(unsigned int cpu)
 		/* Alloc the mondo queues, cpu will load them.  */
 		sun4v_init_mondo_queues(0, cpu, 1, 0);
 
-#ifdef CONFIG_SUN_LDOMS
+#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
 		if (ldom_domaining_enabled)
 			ldom_startcpu_cpuid(cpu,
 					    (unsigned long) cpu_new_thread);

include/asm-sparc64/ldc.h

@@ -7,7 +7,6 @@ extern int ldom_domaining_enabled;
 extern void ldom_set_var(const char *var, const char *value);
 extern void ldom_reboot(const char *boot_command);
 extern void ldom_power_off(void);
-extern void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg);
 
 /* The event handler will be evoked when link state changes
  * or data becomes available on the receive side.