debugobjects: add timer specific object debugging code

Add calls to the generic object debugging infrastructure and provide fixup
functions which allow to keep the system alive when recoverable problems have
been detected by the object debugging core code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 29 insertions, 1 deletions

diff --git a/include/linux/poison.h b/include/linux/poison.h
index a9c31be7052..9f31683728f 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -10,6 +10,13 @@
 #define LIST_POISON1  ((void *) 0x00100100)
 #define LIST_POISON2  ((void *) 0x00200200)
 
+/********** include/linux/timer.h **********/
+/*
+ * Magic number "tsta" to indicate a static timer initializer
+ * for the object debugging code.
+ */
+#define TIMER_ENTRY_STATIC      ((void *) 0x74737461)
+
 /********** mm/slab.c **********/
 /*
  * Magic nums for obj red zoning.
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 979fefdeb86..d4ba79248a2 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -4,6 +4,7 @@
 #include <linux/list.h>
 #include <linux/ktime.h>
 #include <linux/stddef.h>
+#include <linux/debugobjects.h>
 
 struct tvec_base;
 
@@ -25,6 +26,7 @@ struct timer_list {
 extern struct tvec_base boot_tvec_bases;
 
 #define TIMER_INITIALIZER(_function, _expires, _data) {         \
+                .entry = { .prev = TIMER_ENTRY_STATIC },        \
                 .function = (_function),                        \
                 .expires = (_expires),                          \
                 .data = (_data),                                \
@@ -38,6 +40,17 @@ extern struct tvec_base boot_tvec_bases;
 void init_timer(struct timer_list *timer);
 void init_timer_deferrable(struct timer_list *timer);
 
+#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
+extern void init_timer_on_stack(struct timer_list *timer);
+extern void destroy_timer_on_stack(struct timer_list *timer);
+#else
+static inline void destroy_timer_on_stack(struct timer_list *timer) { }
+static inline void init_timer_on_stack(struct timer_list *timer)
+{
+        init_timer(timer);
+}
+#endif
+
 static inline void setup_timer(struct timer_list * timer,
                                 void (*function)(unsigned long),
                                 unsigned long data)
@@ -47,6 +60,15 @@ static inline void setup_timer(struct timer_list * timer,
         init_timer(timer);
 }
 
+static inline void setup_timer_on_stack(struct timer_list *timer,
+                                        void (*function)(unsigned long),
+                                        unsigned long data)
+{
+        timer->function = function;
+        timer->data = data;
+        init_timer_on_stack(timer);
+}
+
 /**
  * timer_pending - is a timer pending?
  * @timer: the timer in question
@@ -164,5 +186,4 @@ unsigned long __round_jiffies_relative(unsigned long j, int cpu);
 unsigned long round_jiffies(unsigned long j);
 unsigned long round_jiffies_relative(unsigned long j);
 
-
 #endif