[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>

4 files changed, 8 insertions, 9 deletions

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 9f643309ed3d..2ff90a1a1056 100644
--- a/arch/s390/kernel/process.c
+++ b/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;
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index e10f4ca00499..cbfcfd02a43a 100644
--- a/arch/s390/kernel/smp.c
+++ b/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));
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 012135b8b32e..5d21e9e6e7b4 100644
--- a/arch/s390/kernel/traps.c
+++ b/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);
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 795bfcb95def..c5cbc4bd8414 100644
--- a/include/asm-s390/processor.h
+++ b/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])