1 files changed, 22 insertions, 37 deletions

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 78b64fe5e7c2..008c74526fd3 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -58,10 +58,18 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
-	struct stack_frame *sf;
+	struct stack_frame *sf, *low, *high;
 
-	sf = (struct stack_frame *) tsk->thread.ksp;
-	sf = (struct stack_frame *) sf->back_chain;
+	if (!tsk || !task_stack_page(tsk))
+		return 0;
+	low = task_stack_page(tsk);
+	high = (struct stack_frame *) task_pt_regs(tsk);
+	sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN);
+	if (sf <= low || sf > high)
+		return 0;
+	sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN);
+	if (sf <= low || sf > high)
+		return 0;
 	return sf->gprs[8];
 }
 
@@ -153,7 +161,7 @@ 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);
@@ -217,8 +225,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
             struct pt_regs childregs;
           } *frame;
 
-        frame = ((struct fake_frame *)
-		 (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
+        frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
         p->thread.ksp = (unsigned long) frame;
 	/* Store access registers to kernel stack of new process. */
         frame->childregs = *regs;
@@ -235,7 +242,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
 	/* Save access registers to new thread structure. */
 	save_access_regs(&p->thread.acrs[0]);
 
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
         /*
 	 * save fprs to current->thread.fp_regs to merge them with
 	 * the emulated registers and then copy the result to the child.
@@ -247,7 +254,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
 	/* Set a new TLS ?  */
 	if (clone_flags & CLONE_SETTLS)
 		p->thread.acrs[0] = regs->gprs[6];
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
 	/* Save the fpu registers to new thread structure. */
 	save_fp_regs(&p->thread.fp_regs);
         p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _REGION_TABLE;
@@ -260,7 +267,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
 			p->thread.acrs[1] = (unsigned int) regs->gprs[6];
 		}
 	}
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
 	/* start new process with ar4 pointing to the correct address space */
 	p->thread.mm_segment = get_fs();
         /* Don't copy debug registers */
@@ -339,51 +346,29 @@ out:
  */
 int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
 {
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
         /*
 	 * save fprs to current->thread.fp_regs to merge them with
 	 * the emulated registers and then copy the result to the dump.
 	 */
 	save_fp_regs(&current->thread.fp_regs);
 	memcpy(fpregs, &current->thread.fp_regs, sizeof(s390_fp_regs));
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
 	save_fp_regs(fpregs);
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
 	return 1;
 }
 
-/*
- * fill in the user structure for a core dump..
- */
-void dump_thread(struct pt_regs * regs, struct user * dump)
-{
-
-/* changed the size calculations - should hopefully work better. lbt */
-	dump->magic = CMAGIC;
-	dump->start_code = 0;
-	dump->start_stack = regs->gprs[15] & ~(PAGE_SIZE - 1);
-	dump->u_tsize = current->mm->end_code >> PAGE_SHIFT;
-	dump->u_dsize = (current->mm->brk + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	dump->u_dsize -= dump->u_tsize;
-	dump->u_ssize = 0;
-	if (dump->start_stack < TASK_SIZE)
-		dump->u_ssize = (TASK_SIZE - dump->start_stack) >> PAGE_SHIFT;
-	memcpy(&dump->regs, regs, sizeof(s390_regs));
-	dump_fpu (regs, &dump->regs.fp_regs);
-	dump->regs.per_info = current->thread.per_info;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	struct stack_frame *sf, *low, *high;
 	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;