[PATCH] mutex subsystem, more debugging code

more mutex debugging: check for held locks during memory freeing,
task exit, enable sysrq printouts, etc.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index caceabf3f230..309a46fa16f8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -29,6 +29,7 @@
 #include <linux/syscalls.h>
 #include <linux/signal.h>
 #include <linux/cn_proc.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -869,6 +870,10 @@ fastcall NORET_TYPE void do_exit(long code)
         mpol_free(tsk->mempolicy);
         tsk->mempolicy = NULL;
 #endif
+        /*
+         * If DEBUG_MUTEXES is on, make sure we are holding no locks:
+         */
+        mutex_debug_check_no_locks_held(tsk);
 
         /* PF_DEAD causes final put_task_struct after we schedule. */
         preempt_disable();
diff --git a/kernel/sched.c b/kernel/sched.c
index 92733091154c..34a945bcc022 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4386,6 +4386,7 @@ void show_state(void)
         } while_each_thread(g, p);
 
         read_unlock(&tasklist_lock);
+        mutex_debug_show_all_locks();
 }
 
 /**