Merge branch 'linus' into stackprotector

Conflicts:
	arch/x86/include/asm/pda.h
	kernel/fork.c

1 files changed, 146 insertions, 84 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1a7e8461db5a..bd5ff78798c2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -96,6 +96,7 @@ struct exec_domain;
 struct futex_pi_state;
 struct robust_list_head;
 struct bio;
+struct bts_tracer;
 
 /*
  * List of flags we want to share for kernel threads,
@@ -247,6 +248,7 @@ extern void init_idle(struct task_struct *idle, int cpu);
 extern void init_idle_bootup_task(struct task_struct *idle);
 
 extern int runqueue_is_locked(void);
+extern void task_rq_unlock_wait(struct task_struct *p);
 
 extern cpumask_t nohz_cpu_mask;
 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
@@ -258,8 +260,6 @@ static inline int select_nohz_load_balancer(int cpu)
 }
 #endif
 
-extern unsigned long rt_needs_cpu(int cpu);
-
 /*
  * Only dump TASK_* tasks. (0 for all tasks)
  */
@@ -287,7 +287,6 @@ extern void trap_init(void);
 extern void account_process_tick(struct task_struct *task, int user);
 extern void update_process_times(int user);
 extern void scheduler_tick(void);
-extern void hrtick_resched(void);
 
 extern void sched_show_task(struct task_struct *p);
 
@@ -403,12 +402,21 @@ extern int get_dumpable(struct mm_struct *mm);
 #define MMF_DUMP_MAPPED_PRIVATE 4
 #define MMF_DUMP_MAPPED_SHARED  5
 #define MMF_DUMP_ELF_HEADERS    6
+#define MMF_DUMP_HUGETLB_PRIVATE 7
+#define MMF_DUMP_HUGETLB_SHARED  8
 #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
-#define MMF_DUMP_FILTER_BITS    5
+#define MMF_DUMP_FILTER_BITS    7
 #define MMF_DUMP_FILTER_MASK \
         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 #define MMF_DUMP_FILTER_DEFAULT \
-        ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
+        ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
+         (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
+
+#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
+# define MMF_DUMP_MASK_DEFAULT_ELF      (1 << MMF_DUMP_ELF_HEADERS)
+#else
+# define MMF_DUMP_MASK_DEFAULT_ELF      0
+#endif
 
 struct sighand_struct {
         atomic_t                count;
@@ -425,6 +433,39 @@ struct pacct_struct {
         unsigned long           ac_minflt, ac_majflt;
 };
 
+/**
+ * struct task_cputime - collected CPU time counts
+ * @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
+ *
+ * This structure groups together three kinds of CPU time that are
+ * tracked for threads and thread groups.  Most things considering
+ * CPU time want to group these counts together and treat all three
+ * of them in parallel.
+ */
+struct task_cputime {
+        cputime_t utime;
+        cputime_t stime;
+        unsigned long long sum_exec_runtime;
+};
+/* Alternate field names when used to cache expirations. */
+#define prof_exp        stime
+#define virt_exp        utime
+#define sched_exp       sum_exec_runtime
+
+/**
+ * struct thread_group_cputime - thread group interval timer counts
+ * @totals:             thread group interval timers; substructure for
+ *                      uniprocessor kernel, per-cpu for SMP kernel.
+ *
+ * This structure contains the version of task_cputime, above, that is
+ * used for thread group CPU clock calculations.
+ */
+struct thread_group_cputime {
+        struct task_cputime *totals;
+};
+
 /*
  * NOTE! "signal_struct" does not have it's own
  * locking, because a shared signal_struct always
@@ -470,6 +511,17 @@ struct signal_struct {
         cputime_t it_prof_expires, it_virt_expires;
         cputime_t it_prof_incr, it_virt_incr;
 
+        /*
+         * Thread group totals for process CPU clocks.
+         * See thread_group_cputime(), et al, for details.
+         */
+        struct thread_group_cputime cputime;
+
+        /* Earliest-expiration cache. */
+        struct task_cputime cputime_expires;
+
+        struct list_head cpu_timers[3];
+
         /* job control IDs */
 
         /*
@@ -500,7 +552,7 @@ struct signal_struct {
          * Live threads maintain their own counters and add to these
          * in __exit_signal, except for the group leader.
          */
-        cputime_t utime, stime, cutime, cstime;
+        cputime_t cutime, cstime;
         cputime_t gtime;
         cputime_t cgtime;
         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
@@ -509,14 +561,6 @@ struct signal_struct {
         struct task_io_accounting ioac;
 
         /*
-         * Cumulative ns of scheduled CPU time for dead threads in the
-         * group, not including a zombie group leader.  (This only differs
-         * from jiffies_to_ns(utime + stime) if sched_clock uses something
-         * other than jiffies.)
-         */
-        unsigned long long sum_sched_runtime;
-
-        /*
          * We don't bother to synchronize most readers of this at all,
          * because there is no reader checking a limit that actually needs
          * to get both rlim_cur and rlim_max atomically, and either one
@@ -527,14 +571,6 @@ struct signal_struct {
          */
         struct rlimit rlim[RLIM_NLIMITS];
 
-        struct list_head cpu_timers[3];
-
-        /* keep the process-shared keyrings here so that they do the right
-         * thing in threads created with CLONE_THREAD */
-#ifdef CONFIG_KEYS
-        struct key *session_keyring;    /* keyring inherited over fork */
-        struct key *process_keyring;    /* keyring private to this process */
-#endif
 #ifdef CONFIG_BSD_PROCESS_ACCT
         struct pacct_struct pacct;      /* per-process accounting information */
 #endif
@@ -587,6 +623,10 @@ struct user_struct {
         atomic_t inotify_watches; /* How many inotify watches does this user have? */
         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
         /* protected by mq_lock */
         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
@@ -601,6 +641,7 @@ struct user_struct {
         /* Hash table maintenance information */
         struct hlist_node uidhash_node;
         uid_t uid;
+        struct user_namespace *user_ns;
 
 #ifdef CONFIG_USER_SCHED
         struct task_group *tg;
@@ -618,6 +659,7 @@ extern struct user_struct *find_user(uid_t);
 extern struct user_struct root_user;
 #define INIT_USER (&root_user)
 
+
 struct backing_dev_info;
 struct reclaim_state;
 
@@ -625,8 +667,7 @@ struct reclaim_state;
 struct sched_info {
         /* cumulative counters */
         unsigned long pcount;         /* # of times run on this cpu */
-        unsigned long long cpu_time,  /* time spent on the cpu */
-                           run_delay; /* time spent waiting on a runqueue */
+        unsigned long long run_delay; /* time spent waiting on a runqueue */
 
         /* timestamps */
         unsigned long long last_arrival,/* when we last ran on a cpu */
@@ -638,10 +679,6 @@ struct sched_info {
 };
 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 
-#ifdef CONFIG_SCHEDSTATS
-extern const struct file_operations proc_schedstat_operations;
-#endif /* CONFIG_SCHEDSTATS */
-
 #ifdef CONFIG_TASK_DELAY_ACCT
 struct task_delay_info {
         spinlock_t      lock;
@@ -845,38 +882,7 @@ partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 #endif  /* !CONFIG_SMP */
 
 struct io_context;                      /* See blkdev.h */
-#define NGROUPS_SMALL           32
-#define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
-struct group_info {
-        int ngroups;
-        atomic_t usage;
-        gid_t small_block[NGROUPS_SMALL];
-        int nblocks;
-        gid_t *blocks[0];
-};
-
-/*
- * get_group_info() must be called with the owning task locked (via task_lock())
- * when task != current.  The reason being that the vast majority of callers are
- * looking at current->group_info, which can not be changed except by the
- * current task.  Changing current->group_info requires the task lock, too.
- */
-#define get_group_info(group_info) do { \
-        atomic_inc(&(group_info)->usage); \
-} while (0)
 
-#define put_group_info(group_info) do { \
-        if (atomic_dec_and_test(&(group_info)->usage)) \
-                groups_free(group_info); \
-} while (0)
-
-extern struct group_info *groups_alloc(int gidsetsize);
-extern void groups_free(struct group_info *group_info);
-extern int set_current_groups(struct group_info *group_info);
-extern int groups_search(struct group_info *group_info, gid_t grp);
-/* access the groups "array" with this macro */
-#define GROUP_AT(gi, i) \
-    ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 
 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 extern void prefetch_stack(struct task_struct *t);
@@ -898,7 +904,6 @@ struct sched_class {
         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
         void (*yield_task) (struct rq *rq);
-        int  (*select_task_rq)(struct task_struct *p, int sync);
 
         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
 
@@ -906,6 +911,8 @@ struct sched_class {
         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 
 #ifdef CONFIG_SMP
+        int  (*select_task_rq)(struct task_struct *p, int sync);
+
         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
                         struct rq *busiest, unsigned long max_load_move,
                         struct sched_domain *sd, enum cpu_idle_type idle,
@@ -917,16 +924,17 @@ struct sched_class {
         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
         void (*post_schedule) (struct rq *this_rq);
         void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
-#endif
 
-        void (*set_curr_task) (struct rq *rq);
-        void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
-        void (*task_new) (struct rq *rq, struct task_struct *p);
         void (*set_cpus_allowed)(struct task_struct *p,
                                  const cpumask_t *newmask);
 
         void (*rq_online)(struct rq *rq);
         void (*rq_offline)(struct rq *rq);
+#endif
+
+        void (*set_curr_task) (struct rq *rq);
+        void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
+        void (*task_new) (struct rq *rq, struct task_struct *p);
 
         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
                                int running);
@@ -1119,6 +1127,19 @@ struct task_struct {
         struct list_head ptraced;
         struct list_head ptrace_entry;
 
+#ifdef CONFIG_X86_PTRACE_BTS
+        /*
+         * This is the tracer handle for the ptrace BTS extension.
+         * This field actually belongs to the ptracer task.
+         */
+        struct bts_tracer *bts;
+        /*
+         * The buffer to hold the BTS data.
+         */
+        void *bts_buffer;
+        size_t bts_size;
+#endif /* CONFIG_X86_PTRACE_BTS */
+
         /* PID/PID hash table linkage. */
         struct pid_link pids[PIDTYPE_MAX];
         struct list_head thread_group;
@@ -1136,22 +1157,16 @@ struct task_struct {
 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
         unsigned long min_flt, maj_flt;
 
-        cputime_t it_prof_expires, it_virt_expires;
-        unsigned long long it_sched_expires;
+        struct task_cputime cputime_expires;
         struct list_head cpu_timers[3];
 
 /* process credentials */
-        uid_t uid,euid,suid,fsuid;
-        gid_t gid,egid,sgid,fsgid;
-        struct group_info *group_info;
-        kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
-        struct user_struct *user;
-        unsigned securebits;
-#ifdef CONFIG_KEYS
-        unsigned char jit_keyring;      /* default keyring to attach requested keys to */
-        struct key *request_key_auth;   /* assumed request_key authority */
-        struct key *thread_keyring;     /* keyring private to this thread */
-#endif
+        const struct cred *real_cred;   /* objective and real subjective task
+                                         * credentials (COW) */
+        const struct cred *cred;        /* effective (overridable) subjective task
+                                         * credentials (COW) */
+        struct mutex cred_exec_mutex;   /* execve vs ptrace cred calculation mutex */
+
         char comm[TASK_COMM_LEN]; /* executable name excluding path
                                      - access with [gs]et_task_comm (which lock
                                        it with task_lock())
@@ -1188,9 +1203,6 @@ struct task_struct {
         int (*notifier)(void *priv);
         void *notifier_data;
         sigset_t *notifier_mask;
-#ifdef CONFIG_SECURITY
-        void *security;
-#endif
         struct audit_context *audit_context;
 #ifdef CONFIG_AUDITSYSCALL
         uid_t loginuid;
@@ -1303,6 +1315,31 @@ struct task_struct {
         int latency_record_count;
         struct latency_record latency_record[LT_SAVECOUNT];
 #endif
+        /*
+         * time slack values; these are used to round up poll() and
+         * select() etc timeout values. These are in nanoseconds.
+         */
+        unsigned long timer_slack_ns;
+        unsigned long default_timer_slack_ns;
+
+        struct list_head        *scm_work_list;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        /* Index of current stored adress in ret_stack */
+        int curr_ret_stack;
+        /* Stack of return addresses for return function tracing */
+        struct ftrace_ret_stack *ret_stack;
+        /*
+         * Number of functions that haven't been traced
+         * because of depth overrun.
+         */
+        atomic_t trace_overrun;
+        /* Pause for the tracing */
+        atomic_t tracing_graph_pause;
+#endif
+#ifdef CONFIG_TRACING
+        /* state flags for use by tracers */
+        unsigned long trace;
+#endif
 };
 
 /*
@@ -1587,6 +1624,7 @@ extern unsigned long long cpu_clock(int cpu);
 
 extern unsigned long long
 task_sched_runtime(struct task_struct *task);
+extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
 
 /* sched_exec is called by processes performing an exec */
 #ifdef CONFIG_SMP
@@ -1621,6 +1659,7 @@ extern unsigned int sysctl_sched_features;
 extern unsigned int sysctl_sched_migration_cost;
 extern unsigned int sysctl_sched_nr_migrate;
 extern unsigned int sysctl_sched_shares_ratelimit;
+extern unsigned int sysctl_sched_shares_thresh;
 
 int sched_nr_latency_handler(struct ctl_table *table, int write,
                 struct file *file, void __user *buffer, size_t *length,
@@ -1720,7 +1759,6 @@ static inline struct user_struct *get_uid(struct user_struct *u)
         return u;
 }
 extern void free_uid(struct user_struct *);
-extern void switch_uid(struct user_struct *);
 extern void release_uids(struct user_namespace *ns);
 
 #include <asm/current.h>
@@ -1739,9 +1777,6 @@ extern void wake_up_new_task(struct task_struct *tsk,
 extern void sched_fork(struct task_struct *p, int clone_flags);
 extern void sched_dead(struct task_struct *p);
 
-extern int in_group_p(gid_t);
-extern int in_egroup_p(gid_t);
-
 extern void proc_caches_init(void);
 extern void flush_signals(struct task_struct *);
 extern void ignore_signals(struct task_struct *);
@@ -1873,6 +1908,8 @@ static inline unsigned long wait_task_inactive(struct task_struct *p,
 #define for_each_process(p) \
         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
 
+extern bool is_single_threaded(struct task_struct *);
+
 /*
  * Careful: do_each_thread/while_each_thread is a double loop so
  *          'break' will not work as expected - use goto instead.
@@ -2097,6 +2134,30 @@ 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)
+{
+        sig->cputime.totals = NULL;
+}
+
+static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
+{
+        if (curr->signal->cputime.totals)
+                return 0;
+        return thread_group_cputime_alloc(curr);
+}
+
+static inline void thread_group_cputime_free(struct signal_struct *sig)
+{
+        free_percpu(sig->cputime.totals);
+}
+
+/*
  * Reevaluate whether the task has signals pending delivery.
  * Wake the task if so.
  * This is required every time the blocked sigset_t changes.
@@ -2158,6 +2219,7 @@ extern void normalize_rt_tasks(void);
 extern struct task_group init_task_group;
 #ifdef CONFIG_USER_SCHED
 extern struct task_group root_task_group;
+extern void set_tg_uid(struct user_struct *user);
 #endif
 
 extern struct task_group *sched_create_group(struct task_group *parent);