[PATCH 3/5] dump_stack: introduce generic show_stack_lvl()

[aris@redhat.com]

[-- Attachment #1: introduce_generic_show_stack.patch --]
[-- Type: text/plain, Size: 1897 bytes --]

show_stack_lvl() works like show_stack() but allows also passing the log level.
The default implementation that should be overrided by architecture specific
code simply will call the existing show_stack().

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Aristeu Rozanski <aris@redhat.com>

---
 include/linux/sched.h |    2 ++
 lib/dump_stack.c      |    8 +++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

--- linux-2.6.orig/lib/dump_stack.c	2015-11-05 14:31:44.581921915 -0500
+++ linux-2.6/lib/dump_stack.c	2015-11-05 14:32:47.508211219 -0500
@@ -9,10 +9,16 @@
 #include <linux/smp.h>
 #include <linux/atomic.h>
 
+void __weak show_stack_lvl(struct task_struct *task, unsigned long *sp,
+			       char *log_lvl)
+{
+	return show_stack(task, sp);
+}
+
 static void __dump_stack(char *log_lvl)
 {
 	dump_stack_print_info(log_lvl);
-	show_stack(NULL, NULL);
+	show_stack_lvl(NULL, NULL, log_lvl);
 }
 
 /**
--- linux-2.6.orig/include/linux/sched.h	2015-11-05 14:31:44.581921915 -0500
+++ linux-2.6/include/linux/sched.h	2015-11-05 14:31:52.426833314 -0500
@@ -368,6 +368,8 @@ extern void show_regs(struct pt_regs *);
  * trace (or NULL if the entire call-chain of the task should be shown).
  */
 extern void show_stack(struct task_struct *task, unsigned long *sp);
+extern void show_stack_lvl(struct task_struct *task, unsigned long *sp,
+			   char *log_lvl);
 
 extern void cpu_init (void);
 extern void trap_init(void);

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