Merge branch 'p-ti-linux-3.8.y' into p-ti-android-3.8.y

[android-sdk/kernel-video.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d2112477ff5e0ed9a942c9698cbf8549e6087a9c..ed1650699563747ea9d48ff28b7192db9bb41c66 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -163,9 +163,10 @@ print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 #define TASK_DEAD              64
 #define TASK_WAKEKILL          128
 #define TASK_WAKING            256
-#define TASK_STATE_MAX         512
+#define TASK_PARKED            512
+#define TASK_STATE_MAX         1024
 
-#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
+#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
 
 extern char ___assert_task_state[1 - 2*!!(
                sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
@@ -1795,6 +1796,9 @@ static inline void put_task_struct(struct task_struct *t)
 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
 
+extern int task_free_register(struct notifier_block *n);
+extern int task_free_unregister(struct notifier_block *n);
+
 /*
  * Per process flags
  */
@@ -2485,27 +2489,18 @@ static inline void threadgroup_change_end(struct task_struct *tsk)
  *
  * Lock the threadgroup @tsk belongs to.  No new task is allowed to enter
  * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
- * perform exec.  This is useful for cases where the threadgroup needs to
- * stay stable across blockable operations.
+ * change ->group_leader/pid.  This is useful for cases where the threadgroup
+ * needs to stay stable across blockable operations.
  *
  * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
  * synchronization.  While held, no new task will be added to threadgroup
  * and no existing live task will have its PF_EXITING set.
  *
- * During exec, a task goes and puts its thread group through unusual
- * changes.  After de-threading, exclusive access is assumed to resources
- * which are usually shared by tasks in the same group - e.g. sighand may
- * be replaced with a new one.  Also, the exec'ing task takes over group
- * leader role including its pid.  Exclude these changes while locked by
- * grabbing cred_guard_mutex which is used to synchronize exec path.
+ * de_thread() does threadgroup_change_{begin|end}() when a non-leader
+ * sub-thread becomes a new leader.
  */
 static inline void threadgroup_lock(struct task_struct *tsk)
 {
-       /*
-        * exec uses exit for de-threading nesting group_rwsem inside
-        * cred_guard_mutex. Grab cred_guard_mutex first.
-        */
-       mutex_lock(&tsk->signal->cred_guard_mutex);
        down_write(&tsk->signal->group_rwsem);
 }
 
@@ -2518,7 +2513,6 @@ static inline void threadgroup_lock(struct task_struct *tsk)
 static inline void threadgroup_unlock(struct task_struct *tsk)
 {
        up_write(&tsk->signal->group_rwsem);
-       mutex_unlock(&tsk->signal->cred_guard_mutex);
 }
 #else
 static inline void threadgroup_change_begin(struct task_struct *tsk) {}