Merge branch 'linus' into perfcounters/core-v2

[karo-tx-linux.git] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 384f09caf2ef4ecbcd3cdfdc5ebadd44f6c7f4f6..7a14a2b504f520e6bd8a2c88961832c874955d12 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/fs_struct.h>
 #include <linux/init_task.h>
 #include <trace/sched.h>
 
@@ -157,6 +158,9 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
 {
        struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 
+#ifdef CONFIG_PERF_COUNTERS
+       WARN_ON_ONCE(!list_empty(&tsk->perf_counter_ctx.counter_list));
+#endif
        trace_sched_process_free(tsk);
        put_task_struct(tsk);
 }
@@ -357,16 +361,12 @@ static void reparent_to_kthreadd(void)
 void __set_special_pids(struct pid *pid)
 {
        struct task_struct *curr = current->group_leader;
-       pid_t nr = pid_nr(pid);
 
-       if (task_session(curr) != pid) {
+       if (task_session(curr) != pid)
                change_pid(curr, PIDTYPE_SID, pid);
-               set_task_session(curr, nr);
-       }
-       if (task_pgrp(curr) != pid) {
+
+       if (task_pgrp(curr) != pid)
                change_pid(curr, PIDTYPE_PGID, pid);
-               set_task_pgrp(curr, nr);
-       }
 }
 
 static void set_special_pids(struct pid *pid)
@@ -424,7 +424,6 @@ EXPORT_SYMBOL(disallow_signal);
 void daemonize(const char *name, ...)
 {
        va_list args;
-       struct fs_struct *fs;
        sigset_t blocked;
 
        va_start(args, name);
@@ -457,11 +456,7 @@ void daemonize(const char *name, ...)
 
        /* Become as one with the init task */
 
-       exit_fs(current);       /* current->fs->count--; */
-       fs = init_task.fs;
-       current->fs = fs;
-       atomic_inc(&fs->count);
-
+       daemonize_fs_struct();
        exit_files(current);
        current->files = init_task.files;
        atomic_inc(&current->files->count);
@@ -560,30 +555,6 @@ void exit_files(struct task_struct *tsk)
        }
 }
 
-void put_fs_struct(struct fs_struct *fs)
-{
-       /* No need to hold fs->lock if we are killing it */
-       if (atomic_dec_and_test(&fs->count)) {
-               path_put(&fs->root);
-               path_put(&fs->pwd);
-               kmem_cache_free(fs_cachep, fs);
-       }
-}
-
-void exit_fs(struct task_struct *tsk)
-{
-       struct fs_struct * fs = tsk->fs;
-
-       if (fs) {
-               task_lock(tsk);
-               tsk->fs = NULL;
-               task_unlock(tsk);
-               put_fs_struct(fs);
-       }
-}
-
-EXPORT_SYMBOL_GPL(exit_fs);
-
 #ifdef CONFIG_MM_OWNER
 /*
  * Task p is exiting and it owned mm, lets find a new owner for it
@@ -1012,10 +983,6 @@ NORET_TYPE void do_exit(long code)
        tsk->mempolicy = NULL;
 #endif
 #ifdef CONFIG_FUTEX
-       /*
-        * This must happen late, after the PID is not
-        * hashed anymore:
-        */
        if (unlikely(!list_empty(&tsk->pi_state_list)))
                exit_pi_state_list(tsk);
        if (unlikely(current->pi_state_cache))
@@ -1282,6 +1249,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
         */
        read_unlock(&tasklist_lock);
 
+       /*
+        * Flush inherited counters to the parent - before the parent
+        * gets woken up by child-exit notifications.
+        */
+       perf_counter_exit_task(p);
+
        retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
        status = (p->signal->flags & SIGNAL_GROUP_EXIT)
                ? p->signal->group_exit_code : p->exit_code;