Merge tag 'pinctrl' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...

[pandora-kernel.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index b058c58..b77fd55 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -76,6 +76,9 @@
 
 #include <trace/events/sched.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/task.h>
+
 /*
  * Protected counters by write_lock_irq(&tasklist_lock)
  */
@@ -644,6 +647,26 @@ struct mm_struct *get_task_mm(struct task_struct *task)
 }
 EXPORT_SYMBOL_GPL(get_task_mm);
 
+struct mm_struct *mm_access(struct task_struct *task, unsigned int mode)
+{
+       struct mm_struct *mm;
+       int err;
+
+       err =  mutex_lock_killable(&task->signal->cred_guard_mutex);
+       if (err)
+               return ERR_PTR(err);
+
+       mm = get_task_mm(task);
+       if (mm && mm != current->mm &&
+                       !ptrace_may_access(task, mode)) {
+               mmput(mm);
+               mm = ERR_PTR(-EACCES);
+       }
+       mutex_unlock(&task->signal->cred_guard_mutex);
+
+       return mm;
+}
+
 /* Please note the differences between mmput and mm_release.
  * mmput is called whenever we stop holding onto a mm_struct,
  * error success whatever.
@@ -870,6 +893,7 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk)
 {
 #ifdef CONFIG_BLOCK
        struct io_context *ioc = current->io_context;
+       struct io_context *new_ioc;
 
        if (!ioc)
                return 0;
@@ -881,11 +905,12 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk)
                if (unlikely(!tsk->io_context))
                        return -ENOMEM;
        } else if (ioprio_valid(ioc->ioprio)) {
-               tsk->io_context = alloc_io_context(GFP_KERNEL, -1);
-               if (unlikely(!tsk->io_context))
+               new_ioc = get_task_io_context(tsk, GFP_KERNEL, NUMA_NO_NODE);
+               if (unlikely(!new_ioc))
                        return -ENOMEM;
 
-               tsk->io_context->ioprio = ioc->ioprio;
+               new_ioc->ioprio = ioc->ioprio;
+               put_io_context(new_ioc);
        }
 #endif
        return 0;
@@ -972,7 +997,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
        sched_autogroup_fork(sig);
 
 #ifdef CONFIG_CGROUPS
-       init_rwsem(&sig->threadgroup_fork_lock);
+       init_rwsem(&sig->group_rwsem);
 #endif
 
        sig->oom_adj = current->signal->oom_adj;
@@ -992,7 +1017,6 @@ static void copy_flags(unsigned long clone_flags, struct task_struct *p)
        new_flags |= PF_FORKNOEXEC;
        new_flags |= PF_STARTING;
        p->flags = new_flags;
-       clear_freeze_flag(p);
 }
 
 SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr)
@@ -1154,7 +1178,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        p->io_context = NULL;
        p->audit_context = NULL;
        if (clone_flags & CLONE_THREAD)
-               threadgroup_fork_read_lock(current);
+               threadgroup_change_begin(current);
        cgroup_fork(p);
 #ifdef CONFIG_NUMA
        p->mempolicy = mpol_dup(p->mempolicy);
@@ -1292,6 +1316,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
        p->nr_dirtied = 0;
        p->nr_dirtied_pause = 128 >> (PAGE_SHIFT - 10);
+       p->dirty_paused_when = 0;
 
        /*
         * Ok, make it visible to the rest of the system.
@@ -1369,8 +1394,11 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        proc_fork_connector(p);
        cgroup_post_fork(p);
        if (clone_flags & CLONE_THREAD)
-               threadgroup_fork_read_unlock(current);
+               threadgroup_change_end(current);
        perf_event_fork(p);
+
+       trace_task_newtask(p, clone_flags);
+
        return p;
 
 bad_fork_free_pid:
@@ -1404,7 +1432,7 @@ bad_fork_cleanup_policy:
 bad_fork_cleanup_cgroup:
 #endif
        if (clone_flags & CLONE_THREAD)
-               threadgroup_fork_read_unlock(current);
+               threadgroup_change_end(current);
        cgroup_exit(p, cgroup_callbacks_done);
        delayacct_tsk_free(p);
        module_put(task_thread_info(p)->exec_domain->module);
@@ -1519,8 +1547,6 @@ long do_fork(unsigned long clone_flags,
                        init_completion(&vfork);
                }
 
-               audit_finish_fork(p);
-
                /*
                 * We set PF_STARTING at creation in case tracing wants to
                 * use this to distinguish a fully live task from one that