1 files changed, 39 insertions, 30 deletions

diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index d306fe04489a..d2012635b093 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -41,51 +41,50 @@ const char *stack_type_name(enum stack_type type)
 EXPORT_SYMBOL_GPL(stack_type_name);
 
 static inline bool in_stack(unsigned long sp, struct stack_info *info,
-			    enum stack_type type, unsigned long low,
-			    unsigned long high)
+			    enum stack_type type, unsigned long stack)
 {
-	if (sp < low || sp >= high)
+	if (sp < stack || sp >= stack + THREAD_SIZE)
 		return false;
 	info->type = type;
-	info->begin = low;
-	info->end = high;
+	info->begin = stack;
+	info->end = stack + THREAD_SIZE;
 	return true;
 }
 
 static bool in_task_stack(unsigned long sp, struct task_struct *task,
 			  struct stack_info *info)
 {
-	unsigned long stack;
+	unsigned long stack = (unsigned long)task_stack_page(task);
 
-	stack = (unsigned long) task_stack_page(task);
-	return in_stack(sp, info, STACK_TYPE_TASK, stack, stack + THREAD_SIZE);
+	return in_stack(sp, info, STACK_TYPE_TASK, stack);
 }
 
 static bool in_irq_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long frame_size, top;
+	unsigned long stack = S390_lowcore.async_stack - STACK_INIT_OFFSET;
 
-	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
-	top = S390_lowcore.async_stack + frame_size;
-	return in_stack(sp, info, STACK_TYPE_IRQ, top - THREAD_SIZE, top);
+	return in_stack(sp, info, STACK_TYPE_IRQ, stack);
 }
 
 static bool in_nodat_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long frame_size, top;
+	unsigned long stack = S390_lowcore.nodat_stack - STACK_INIT_OFFSET;
 
-	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
-	top = S390_lowcore.nodat_stack + frame_size;
-	return in_stack(sp, info, STACK_TYPE_NODAT, top - THREAD_SIZE, top);
+	return in_stack(sp, info, STACK_TYPE_NODAT, stack);
+}
+
+static bool in_mcck_stack(unsigned long sp, struct stack_info *info)
+{
+	unsigned long stack = S390_lowcore.mcck_stack - STACK_INIT_OFFSET;
+
+	return in_stack(sp, info, STACK_TYPE_MCCK, stack);
 }
 
 static bool in_restart_stack(unsigned long sp, struct stack_info *info)
 {
-	unsigned long frame_size, top;
+	unsigned long stack = S390_lowcore.restart_stack - STACK_INIT_OFFSET;
 
-	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
-	top = S390_lowcore.restart_stack + frame_size;
-	return in_stack(sp, info, STACK_TYPE_RESTART, top - THREAD_SIZE, top);
+	return in_stack(sp, info, STACK_TYPE_RESTART, stack);
 }
 
 int get_stack_info(unsigned long sp, struct task_struct *task,
@@ -108,7 +107,8 @@ int get_stack_info(unsigned long sp, struct task_struct *task,
 	/* Check per-cpu stacks */
 	if (!in_irq_stack(sp, info) &&
 	    !in_nodat_stack(sp, info) &&
-	    !in_restart_stack(sp, info))
+	    !in_restart_stack(sp, info) &&
+	    !in_mcck_stack(sp, info))
 		goto unknown;
 
 recursion_check:
@@ -126,22 +126,29 @@ unknown:
 	return -EINVAL;
 }
 
-void show_stack(struct task_struct *task, unsigned long *stack)
+void show_stack(struct task_struct *task, unsigned long *stack,
+		       const char *loglvl)
 {
 	struct unwind_state state;
 
-	printk("Call Trace:\n");
+	printk("%sCall Trace:\n", loglvl);
 	unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)
-		printk(state.reliable ? " [<%016lx>] %pSR \n" :
-					"([<%016lx>] %pSR)\n",
-		       state.ip, (void *) state.ip);
+		printk(state.reliable ? "%s [<%016lx>] %pSR \n" :
+					"%s([<%016lx>] %pSR)\n",
+		       loglvl, state.ip, (void *) state.ip);
 	debug_show_held_locks(task ? : current);
 }
 
 static void show_last_breaking_event(struct pt_regs *regs)
 {
 	printk("Last Breaking-Event-Address:\n");
-	printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
+	printk(" [<%016lx>] ", regs->last_break);
+	if (user_mode(regs)) {
+		print_vma_addr(KERN_CONT, regs->last_break);
+		pr_cont("\n");
+	} else {
+		pr_cont("%pSR\n", (void *)regs->last_break);
+	}
 }
 
 void show_registers(struct pt_regs *regs)
@@ -175,13 +182,13 @@ void show_regs(struct pt_regs *regs)
 	show_registers(regs);
 	/* Show stack backtrace if pt_regs is from kernel mode */
 	if (!user_mode(regs))
-		show_stack(NULL, (unsigned long *) regs->gprs[15]);
+		show_stack(NULL, (unsigned long *) regs->gprs[15], KERN_DEFAULT);
 	show_last_breaking_event(regs);
 }
 
 static DEFINE_SPINLOCK(die_lock);
 
-void die(struct pt_regs *regs, const char *str)
+void __noreturn die(struct pt_regs *regs, const char *str)
 {
 	static int die_counter;
 
@@ -195,6 +202,8 @@ void die(struct pt_regs *regs, const char *str)
 	       regs->int_code >> 17, ++die_counter);
 #ifdef CONFIG_PREEMPT
 	pr_cont("PREEMPT ");
+#elif defined(CONFIG_PREEMPT_RT)
+	pr_cont("PREEMPT_RT ");
 #endif
 	pr_cont("SMP ");
 	if (debug_pagealloc_enabled())
@@ -211,5 +220,5 @@ void die(struct pt_regs *regs, const char *str)
 	if (panic_on_oops)
 		panic("Fatal exception: panic_on_oops");
 	oops_exit();
-	do_exit(SIGSEGV);
+	make_task_dead(SIGSEGV);
 }