Merge branch 'linux-linaro-lsk' into linux-linaro-lsk-android

[firefly-linux-kernel-4.4.55.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a4c8bf7f47039fc143dfaf5bdb0073536592eba1..5229df9d71077a3de80646f1e80d8d1586994791 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -480,6 +480,7 @@ struct signal_struct {
        atomic_t                sigcnt;
        atomic_t                live;
        int                     nr_threads;
+       struct list_head        thread_head;
 
        wait_queue_head_t       wait_chldexit;  /* for wait4() */
 
@@ -1142,13 +1143,12 @@ struct task_struct {
                                 * execve */
        unsigned in_iowait:1;
 
-       /* task may not gain privileges */
-       unsigned no_new_privs:1;
-
        /* Revert to default priority/policy when forking */
        unsigned sched_reset_on_fork:1;
        unsigned sched_contributes_to_load:1;
 
+       unsigned long atomic_flags; /* Flags needing atomic access. */
+
        pid_t pid;
        pid_t tgid;
 
@@ -1181,6 +1181,7 @@ struct task_struct {
        /* PID/PID hash table linkage. */
        struct pid_link pids[PIDTYPE_MAX];
        struct list_head thread_group;
+       struct list_head thread_node;
 
        struct completion *vfork_done;          /* for vfork() */
        int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
@@ -1430,6 +1431,12 @@ struct task_struct {
                unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
        } memcg_batch;
        unsigned int memcg_kmem_skip_account;
+       struct memcg_oom_info {
+               struct mem_cgroup *memcg;
+               gfp_t gfp_mask;
+               int order;
+               unsigned int may_oom:1;
+       } memcg_oom;
 #endif
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
        atomic_t ptrace_bp_refcnt;
@@ -1692,11 +1699,13 @@ extern int task_free_unregister(struct notifier_block *n);
 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
 #define used_math() tsk_used_math(current)
 
-/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
+/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
+ * __GFP_FS is also cleared as it implies __GFP_IO.
+ */
 static inline gfp_t memalloc_noio_flags(gfp_t flags)
 {
        if (unlikely(current->flags & PF_MEMALLOC_NOIO))
-               flags &= ~__GFP_IO;
+               flags &= ~(__GFP_IO | __GFP_FS);
        return flags;
 }
 
@@ -1712,6 +1721,19 @@ static inline void memalloc_noio_restore(unsigned int flags)
        current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
 }
 
+/* Per-process atomic flags. */
+#define PFA_NO_NEW_PRIVS 0x00000001    /* May not gain new privileges. */
+
+static inline bool task_no_new_privs(struct task_struct *p)
+{
+       return test_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
+}
+
+static inline void task_set_no_new_privs(struct task_struct *p)
+{
+       set_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
+}
+
 /*
  * task->jobctl flags
  */
@@ -2191,6 +2213,16 @@ extern bool current_is_single_threaded(void);
 #define while_each_thread(g, t) \
        while ((t = next_thread(t)) != g)
 
+#define __for_each_thread(signal, t)   \
+       list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
+
+#define for_each_thread(p, t)          \
+       __for_each_thread((p)->signal, t)
+
+/* Careful: this is a double loop, 'break' won't work as expected. */
+#define for_each_process_thread(p, t)  \
+       for_each_process(p) for_each_thread(p, t)
+
 static inline int get_nr_threads(struct task_struct *tsk)
 {
        return tsk->signal->nr_threads;