[PATCH] x86_64: Node local pda take 2 -- cpu_pda preparation

Helper patch to change cpu_pda users to use macros to access cpu_pda
instead of the cpu_pda[] array.
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/irq.c

@@ -70,13 +70,13 @@ int show_interrupts(struct seq_file *p, void *v)
 		seq_printf(p, "NMI: ");
 		for (j = 0; j < NR_CPUS; j++)
 			if (cpu_online(j))
-				seq_printf(p, "%10u ", cpu_pda[j].__nmi_count);
+				seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
 		seq_putc(p, '\n');
 #ifdef CONFIG_X86_LOCAL_APIC
 		seq_printf(p, "LOC: ");
 		for (j = 0; j < NR_CPUS; j++)
 			if (cpu_online(j))
-				seq_printf(p, "%10u ", cpu_pda[j].apic_timer_irqs);
+				seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
 		seq_putc(p, '\n');
 #endif
 		seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));

arch/x86_64/kernel/nmi.c

@@ -155,19 +155,19 @@ int __init check_nmi_watchdog (void)
 		smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
 
 	for (cpu = 0; cpu < NR_CPUS; cpu++)
-		counts[cpu] = cpu_pda[cpu].__nmi_count; 
+		counts[cpu] = cpu_pda(cpu)->__nmi_count;
 	local_irq_enable();
 	mdelay((10*1000)/nmi_hz); // wait 10 ticks
 
 	for (cpu = 0; cpu < NR_CPUS; cpu++) {
 		if (!cpu_online(cpu))
 			continue;
-		if (cpu_pda[cpu].__nmi_count - counts[cpu] <= 5) {
+		if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {
 			endflag = 1;
 			printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
 			       cpu,
 			       counts[cpu],
-			       cpu_pda[cpu].__nmi_count);
+			       cpu_pda(cpu)->__nmi_count);
 			nmi_active = 0;
 			lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;
 			nmi_perfctr_msr = 0;

arch/x86_64/kernel/setup64.c

@@ -30,7 +30,7 @@ char x86_boot_params[BOOT_PARAM_SIZE] __initdata = {0,};
 
 cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
 
-struct x8664_pda cpu_pda[NR_CPUS] __cacheline_aligned; 
+struct x8664_pda _cpu_pda[NR_CPUS] __cacheline_aligned;
 
 struct desc_ptr idt_descr = { 256 * 16, (unsigned long) idt_table }; 
 
@@ -110,18 +110,18 @@ void __init setup_per_cpu_areas(void)
 		}
 		if (!ptr)
 			panic("Cannot allocate cpu data for CPU %d\n", i);
-		cpu_pda[i].data_offset = ptr - __per_cpu_start;
+		cpu_pda(i)->data_offset = ptr - __per_cpu_start;
 		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 	}
 } 
 
 void pda_init(int cpu)
 { 
-	struct x8664_pda *pda = &cpu_pda[cpu];
+	struct x8664_pda *pda = cpu_pda(cpu);
 
 	/* Setup up data that may be needed in __get_free_pages early */
 	asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0)); 
-	wrmsrl(MSR_GS_BASE, cpu_pda + cpu);
+	wrmsrl(MSR_GS_BASE, pda);
 
 	pda->cpunumber = cpu; 
 	pda->irqcount = -1;

arch/x86_64/kernel/smpboot.c

@@ -792,7 +792,7 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
 
 do_rest:
 
-	cpu_pda[cpu].pcurrent = c_idle.idle;
+	cpu_pda(cpu)->pcurrent = c_idle.idle;
 
 	start_rip = setup_trampoline();
 

arch/x86_64/kernel/traps.c

@@ -70,7 +70,6 @@ asmlinkage void reserved(void);
 asmlinkage void alignment_check(void);
 asmlinkage void machine_check(void);
 asmlinkage void spurious_interrupt_bug(void);
-asmlinkage void call_debug(void);
 
 struct notifier_block *die_chain;
 static DEFINE_SPINLOCK(die_notifier_lock);
@@ -139,7 +138,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
 		switch (k + 1) {
 #if DEBUG_STKSZ > EXCEPTION_STKSZ
 		case DEBUG_STACK:
-			end = cpu_pda[cpu].debugstack + DEBUG_STKSZ;
+			end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
 			break;
 #endif
 		default:
@@ -186,7 +185,7 @@ void show_trace(unsigned long *stack)
 {
 	unsigned long addr;
 	const unsigned cpu = safe_smp_processor_id();
-	unsigned long *irqstack_end = (unsigned long *)cpu_pda[cpu].irqstackptr;
+	unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
 	int i;
 	unsigned used = 0;
 
@@ -254,8 +253,8 @@ void show_stack(struct task_struct *tsk, unsigned long * rsp)
 	unsigned long *stack;
 	int i;
 	const int cpu = safe_smp_processor_id();
-	unsigned long *irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
-	unsigned long *irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE);    
+	unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr);
+	unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
 
 	// debugging aid: "show_stack(NULL, NULL);" prints the
 	// back trace for this cpu.
@@ -303,7 +302,7 @@ void show_registers(struct pt_regs *regs)
 	int in_kernel = !user_mode(regs);
 	unsigned long rsp;
 	const int cpu = safe_smp_processor_id(); 
-	struct task_struct *cur = cpu_pda[cpu].pcurrent; 
+	struct task_struct *cur = cpu_pda(cpu)->pcurrent;
 
 		rsp = regs->rsp;
 

arch/x86_64/kernel/x8664_ksyms.c

@@ -96,7 +96,7 @@ EXPORT_SYMBOL(pci_mem_start);
 EXPORT_SYMBOL(copy_page);
 EXPORT_SYMBOL(clear_page);
 
-EXPORT_SYMBOL(cpu_pda);
+EXPORT_SYMBOL(_cpu_pda);
 #ifdef CONFIG_SMP
 EXPORT_SYMBOL(cpu_data);
 EXPORT_SYMBOL(__write_lock_failed);

arch/x86_64/mm/numa.c

@@ -272,7 +272,7 @@ __cpuinit void numa_add_cpu(int cpu)
 
 void __cpuinit numa_set_node(int cpu, int node)
 {
-	cpu_pda[cpu].nodenumber = node;
+	cpu_pda(cpu)->nodenumber = node;
 	cpu_to_node[cpu] = node;
 }
 

include/asm-x86_64/pda.h

@@ -27,7 +27,9 @@ struct x8664_pda {
 	unsigned apic_timer_irqs;
 } ____cacheline_aligned_in_smp;
 
-extern struct x8664_pda cpu_pda[];
+extern struct x8664_pda _cpu_pda[];
+
+#define cpu_pda(i) (&_cpu_pda[i])
 
 /* 
  * There is no fast way to get the base address of the PDA, all the accesses

include/asm-x86_64/percpu.h

@@ -11,7 +11,7 @@
 
 #include <asm/pda.h>
 
-#define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset)
+#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
 #define __my_cpu_offset() read_pda(data_offset)
 
 /* Separate out the type, so (int[3], foo) works. */