lockdep: annotate reclaim context (__GFP_NOFS)

[mirror_ubuntu-zesty-kernel.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4cae9b81a1f8851d51a5380d8d37fa7ba3ceb529..b00a77f4999ed64d2fe668532819e2a29dfb6fd6 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -293,6 +293,9 @@ extern void sched_show_task(struct task_struct *p);
 extern void softlockup_tick(void);
 extern void touch_softlockup_watchdog(void);
 extern void touch_all_softlockup_watchdogs(void);
+extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
+                                   struct file *filp, void __user *buffer,
+                                   size_t *lenp, loff_t *ppos);
 extern unsigned int  softlockup_panic;
 extern unsigned long sysctl_hung_task_check_count;
 extern unsigned long sysctl_hung_task_timeout_secs;
@@ -328,7 +331,9 @@ extern signed long schedule_timeout(signed long timeout);
 extern signed long schedule_timeout_interruptible(signed long timeout);
 extern signed long schedule_timeout_killable(signed long timeout);
 extern signed long schedule_timeout_uninterruptible(signed long timeout);
+asmlinkage void __schedule(void);
 asmlinkage void schedule(void);
+extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
 
 struct nsproxy;
 struct user_namespace;
@@ -440,6 +445,7 @@ struct pacct_struct {
  * @utime:             time spent in user mode, in &cputime_t units
  * @stime:             time spent in kernel mode, in &cputime_t units
  * @sum_exec_runtime:  total time spent on the CPU, in nanoseconds
+ * @lock:              lock for fields in this struct
  *
  * This structure groups together three kinds of CPU time that are
  * tracked for threads and thread groups.  Most things considering
@@ -450,6 +456,7 @@ struct task_cputime {
        cputime_t utime;
        cputime_t stime;
        unsigned long long sum_exec_runtime;
+       spinlock_t lock;
 };
 /* Alternate field names when used to cache expirations. */
 #define prof_exp       stime
@@ -465,7 +472,7 @@ struct task_cputime {
  * used for thread group CPU clock calculations.
  */
 struct thread_group_cputime {
-       struct task_cputime *totals;
+       struct task_cputime totals;
 };
 
 /*
@@ -626,7 +633,6 @@ struct user_struct {
        atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 #endif
 #ifdef CONFIG_EPOLL
-       atomic_t epoll_devs;    /* The number of epoll descriptors currently open */
        atomic_t epoll_watches; /* The number of file descriptors currently watched */
 #endif
 #ifdef CONFIG_POSIX_MQUEUE
@@ -1307,6 +1313,7 @@ struct task_struct {
        int lockdep_depth;
        unsigned int lockdep_recursion;
        struct held_lock held_locks[MAX_LOCK_DEPTH];
+       gfp_t lockdep_reclaim_gfp;
 #endif
 
 /* journalling filesystem info */
@@ -2180,24 +2187,30 @@ static inline int spin_needbreak(spinlock_t *lock)
  * Thread group CPU time accounting.
  */
 
-extern int thread_group_cputime_alloc(struct task_struct *);
-extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
-
-static inline void thread_group_cputime_init(struct signal_struct *sig)
+static inline
+void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
 {
-       sig->cputime.totals = NULL;
+       struct task_cputime *totals = &tsk->signal->cputime.totals;
+       unsigned long flags;
+
+       spin_lock_irqsave(&totals->lock, flags);
+       *times = *totals;
+       spin_unlock_irqrestore(&totals->lock, flags);
 }
 
-static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
+static inline void thread_group_cputime_init(struct signal_struct *sig)
 {
-       if (curr->signal->cputime.totals)
-               return 0;
-       return thread_group_cputime_alloc(curr);
+       sig->cputime.totals = (struct task_cputime){
+               .utime = cputime_zero,
+               .stime = cputime_zero,
+               .sum_exec_runtime = 0,
+       };
+
+       spin_lock_init(&sig->cputime.totals.lock);
 }
 
 static inline void thread_group_cputime_free(struct signal_struct *sig)
 {
-       free_percpu(sig->cputime.totals);
 }
 
 /*