sched-Add-TASK_RUNNING_MUTEX-state.patch

From fb20845c8dac0d4e5e6f692f6612841231578315 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 26 Jul 2009 18:14:57 +0200
Subject: [PATCH] sched: Add TASK_RUNNING_MUTEX state

commit 8741e8754ae91dedd89066cab3092002ba26ce32 in tip.

Necessary for rt_mutex wakeups to preserve the state.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 13b5d07..90dac9b 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -135,12 +135,13 @@ static inline void task_name(struct seq_file *m, struct task_struct *p)
  */
 static const char *task_state_array[] = {
 	"R (running)",		/*   0 */
-	"S (sleeping)",		/*   1 */
-	"D (disk sleep)",	/*   2 */
-	"T (stopped)",		/*   4 */
-	"t (tracing stop)",	/*   8 */
-	"Z (zombie)",		/*  16 */
-	"X (dead)",		/*  32 */
+	"M (running-mutex)",	/*   1 */
+	"S (sleeping)",		/*   2 */
+	"D (disk sleep)",	/*   4 */
+	"T (stopped)",		/*   8 */
+	"T (tracing stop)",	/*  16 */
+	"Z (zombie)",		/*  32 */
+	"X (dead)",		/*  64 */
 	"x (dead)",		/*  64 */
 	"K (wakekill)",		/* 128 */
 	"W (waking)",		/* 256 */
@@ -337,6 +338,18 @@ static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
 	seq_printf(m, "\n");
 }
 
+#define get_blocked_on(t)	(-1)
+
+static inline void show_blocked_on(struct seq_file *m, struct task_struct *p)
+{
+	pid_t pid = get_blocked_on(p);
+
+	if (pid < 0)
+		return;
+
+	seq_printf(m, "BlckOn: %d\n", pid);
+}
+
 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 			struct pid *pid, struct task_struct *task)
 {
@@ -357,6 +370,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 	task_show_regs(m, task);
 #endif
 	task_context_switch_counts(m, task);
+	show_blocked_on(m, task);
 	return 0;
 }
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ae42b44..bdd186d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -187,20 +187,21 @@ print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
  * mistake.
  */
 #define TASK_RUNNING		0
-#define TASK_INTERRUPTIBLE	1
-#define TASK_UNINTERRUPTIBLE	2
-#define __TASK_STOPPED		4
-#define __TASK_TRACED		8
+#define TASK_RUNNING_MUTEX	1
+#define TASK_INTERRUPTIBLE	2
+#define TASK_UNINTERRUPTIBLE	4
+#define __TASK_STOPPED		8
+#define __TASK_TRACED		16
 /* in tsk->exit_state */
-#define EXIT_ZOMBIE		16
-#define EXIT_DEAD		32
+#define EXIT_ZOMBIE		32
+#define EXIT_DEAD		64
 /* in tsk->state again */
-#define TASK_DEAD		64
-#define TASK_WAKEKILL		128
+#define TASK_DEAD		128
+#define TASK_WAKEKILL		256
 #define TASK_WAKING		256
 #define TASK_STATE_MAX		512
 
-#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
+#define TASK_STATE_TO_CHAR_STR "RMSDTtZXxKW"
 
 extern char ___assert_task_state[1 - 2*!!(
 		sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
@@ -212,10 +213,12 @@ extern char ___assert_task_state[1 - 2*!!(
 
 /* Convenience macros for the sake of wake_up */
 #define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
-#define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
+#define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED | \
+				 TASK_RUNNING_MUTEX)
 
 /* get_task_state() */
-#define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \
+#define TASK_REPORT		(TASK_RUNNING | TASK_RUNNING_MUTEX | \
+				 TASK_INTERRUPTIBLE | \
 				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 				 __TASK_TRACED)
 
-- 
1.7.1.1