Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[safe/jmp/linux-2.6] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index b66f0d5..38ec406 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,6 +46,7 @@
 #include <linux/resource.h>
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
+#include <linux/tracehook.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -120,6 +121,7 @@ static void __exit_signal(struct task_struct *tsk)
                sig->nivcsw += tsk->nivcsw;
                sig->inblock += task_io_get_inblock(tsk);
                sig->oublock += task_io_get_oublock(tsk);
+               task_io_accounting_add(&sig->ioac, &tsk->ioac);
                sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
                sig = NULL; /* Marker for below. */
        }
@@ -150,27 +152,17 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
        put_task_struct(container_of(rhp, struct task_struct, rcu));
 }
 
-/*
- * Do final ptrace-related cleanup of a zombie being reaped.
- *
- * Called with write_lock(&tasklist_lock) held.
- */
-static void ptrace_release_task(struct task_struct *p)
-{
-       BUG_ON(!list_empty(&p->ptraced));
-       ptrace_unlink(p);
-       BUG_ON(!list_empty(&p->ptrace_entry));
-}
 
 void release_task(struct task_struct * p)
 {
        struct task_struct *leader;
        int zap_leader;
 repeat:
+       tracehook_prepare_release_task(p);
        atomic_dec(&p->user->processes);
        proc_flush_task(p);
        write_lock_irq(&tasklist_lock);
-       ptrace_release_task(p);
+       tracehook_finish_release_task(p);
        __exit_signal(p);
 
        /*
@@ -192,6 +184,13 @@ repeat:
                 * that case.
                 */
                zap_leader = task_detached(leader);
+
+               /*
+                * This maintains the invariant that release_task()
+                * only runs on a task in EXIT_DEAD, just for sanity.
+                */
+               if (zap_leader)
+                       leader->exit_state = EXIT_DEAD;
        }
 
        write_unlock_irq(&tasklist_lock);
@@ -555,8 +554,6 @@ void put_fs_struct(struct fs_struct *fs)
        if (atomic_dec_and_test(&fs->count)) {
                path_put(&fs->root);
                path_put(&fs->pwd);
-               if (fs->altroot.dentry)
-                       path_put(&fs->altroot);
                kmem_cache_free(fs_cachep, fs);
        }
 }
@@ -691,7 +688,13 @@ static void exit_mm(struct task_struct * tsk)
                if (atomic_dec_and_test(&core_state->nr_threads))
                        complete(&core_state->startup);
 
-               wait_for_completion(&mm->core_done);
+               for (;;) {
+                       set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+                       if (!self.task) /* see coredump_finish() */
+                               break;
+                       schedule();
+               }
+               __set_task_state(tsk, TASK_RUNNING);
                down_read(&mm->mmap_sem);
        }
        atomic_inc(&mm->mm_count);
@@ -869,7 +872,8 @@ static void forget_original_parent(struct task_struct *father)
  */
 static void exit_notify(struct task_struct *tsk, int group_dead)
 {
-       int state;
+       int signal;
+       void *cookie;
 
        /*
         * This does two things:
@@ -906,22 +910,11 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
            !capable(CAP_KILL))
                tsk->exit_signal = SIGCHLD;
 
-       /* If something other than our normal parent is ptracing us, then
-        * send it a SIGCHLD instead of honoring exit_signal.  exit_signal
-        * only has special meaning to our real parent.
-        */
-       if (!task_detached(tsk) && thread_group_empty(tsk)) {
-               int signal = ptrace_reparented(tsk) ?
-                               SIGCHLD : tsk->exit_signal;
-               do_notify_parent(tsk, signal);
-       } else if (tsk->ptrace) {
-               do_notify_parent(tsk, SIGCHLD);
-       }
+       signal = tracehook_notify_death(tsk, &cookie, group_dead);
+       if (signal >= 0)
+               signal = do_notify_parent(tsk, signal);
 
-       state = EXIT_ZOMBIE;
-       if (task_detached(tsk) && likely(!tsk->ptrace))
-               state = EXIT_DEAD;
-       tsk->exit_state = state;
+       tsk->exit_state = signal == DEATH_REAP ? EXIT_DEAD : EXIT_ZOMBIE;
 
        /* mt-exec, de_thread() is waiting for us */
        if (thread_group_leader(tsk) &&
@@ -931,8 +924,10 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 
        write_unlock_irq(&tasklist_lock);
 
+       tracehook_report_death(tsk, signal, cookie, group_dead);
+
        /* If the process is dead, release it - nobody will wait for it */
-       if (state == EXIT_DEAD)
+       if (signal == DEATH_REAP)
                release_task(tsk);
 }
 
@@ -1011,10 +1006,7 @@ NORET_TYPE void do_exit(long code)
        if (unlikely(!tsk->pid))
                panic("Attempted to kill the idle task!");
 
-       if (unlikely(current->ptrace & PT_TRACE_EXIT)) {
-               current->ptrace_message = code;
-               ptrace_notify((PTRACE_EVENT_EXIT << 8) | SIGTRAP);
-       }
+       tracehook_report_exit(&code);
 
        /*
         * We're taking recursive faults here in do_exit. Safest is to just
@@ -1360,6 +1352,8 @@ static int wait_task_zombie(struct task_struct *p, int options,
                psig->coublock +=
                        task_io_get_oublock(p) +
                        sig->oublock + sig->coublock;
+               task_io_accounting_add(&psig->ioac, &p->ioac);
+               task_io_accounting_add(&psig->ioac, &sig->ioac);
                spin_unlock_irq(&p->parent->sighand->siglock);
        }