[PATCH] s390: task_stack_page()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/s390/kernel/process.c

@@ -153,7 +153,7 @@ void show_regs(struct pt_regs *regs)
 {
 	struct task_struct *tsk = current;
 
-        printk("CPU:    %d    %s\n", tsk->thread_info->cpu, print_tainted());
+        printk("CPU:    %d    %s\n", task_thread_info(tsk)->cpu, print_tainted());
         printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
 	       current->comm, current->pid, (void *) tsk,
 	       (void *) tsk->thread.ksp);
@@ -357,11 +357,10 @@ unsigned long get_wchan(struct task_struct *p)
 	unsigned long return_address;
 	int count;
 
-	if (!p || p == current || p->state == TASK_RUNNING || !p->thread_info)
+	if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
 		return 0;
-	low = (struct stack_frame *) p->thread_info;
-	high = (struct stack_frame *)
-		((unsigned long) p->thread_info + THREAD_SIZE) - 1;
+	low = task_stack_page(p);
+	high = (struct stack_frame *) task_pt_regs(p);
 	sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN);
 	if (sf <= low || sf > high)
 		return 0;

arch/s390/kernel/smp.c

@@ -657,7 +657,7 @@ __cpu_up(unsigned int cpu)
 	idle = current_set[cpu];
         cpu_lowcore = lowcore_ptr[cpu];
 	cpu_lowcore->kernel_stack = (unsigned long)
-		idle->thread_info + (THREAD_SIZE);
+		task_stack_page(idle) + (THREAD_SIZE);
 	sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
 				     - sizeof(struct pt_regs)
 				     - sizeof(struct stack_frame));

arch/s390/kernel/traps.c

@@ -136,8 +136,8 @@ void show_trace(struct task_struct *task, unsigned long * stack)
 	sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
 			  S390_lowcore.async_stack);
 	if (task)
-		__show_trace(sp, (unsigned long) task->thread_info,
-			     (unsigned long) task->thread_info + THREAD_SIZE);
+		__show_trace(sp, (unsigned long) task_stack_page(task),
+			     (unsigned long) task_stack_page(task) + THREAD_SIZE);
 	else
 		__show_trace(sp, S390_lowcore.thread_info,
 			     S390_lowcore.thread_info + THREAD_SIZE);

include/asm-s390/processor.h

@@ -192,7 +192,7 @@ extern void show_trace(struct task_struct *task, unsigned long *sp);
 
 unsigned long get_wchan(struct task_struct *p);
 #define task_pt_regs(tsk) ((struct pt_regs *) \
-        ((void *)(tsk)->thread_info + THREAD_SIZE) - 1)
+        (task_stack_page(tsk) + THREAD_SIZE) - 1)
 #define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)
 #define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15])