X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Ffork.c;h=7f48abdd7bb60336b245b897c61e94e9538fb05a;hb=8a25d5debff2daee280e83e09d8c25d67c26a972;hp=ac8100e3088a1f6d99d8ad640a70a3de5ec96e5e;hpb=61fb46c5b3578fda7cc780e8bc53b3e8f8c1a143;p=linux-2.6

diff --git a/kernel/fork.c b/kernel/fork.c
index ac8100e308..7f48abdd7b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -11,7 +11,6 @@
  * management can be a bitch. See 'mm/memory.c': 'copy_page_range()'
  */
 
-#include <linux/config.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
@@ -104,6 +103,7 @@ static kmem_cache_t *mm_cachep;
 void free_task(struct task_struct *tsk)
 {
 	free_thread_info(tsk->thread_info);
+	rt_mutex_debug_task_free(tsk);
 	free_task_struct(tsk);
 }
 EXPORT_SYMBOL(free_task);
@@ -368,6 +368,8 @@ void fastcall __mmdrop(struct mm_struct *mm)
  */
 void mmput(struct mm_struct *mm)
 {
+	might_sleep();
+
 	if (atomic_dec_and_test(&mm->mm_users)) {
 		exit_aio(mm);
 		exit_mmap(mm);
@@ -623,6 +625,7 @@ out:
 /*
  * Allocate a new files structure and copy contents from the
  * passed in files structure.
+ * errorp will be valid only when the returned files_struct is NULL.
  */
 static struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
 {
@@ -631,6 +634,7 @@ static struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
 	int open_files, size, i, expand;
 	struct fdtable *old_fdt, *new_fdt;
 
+	*errorp = -ENOMEM;
 	newf = alloc_files();
 	if (!newf)
 		goto out;
@@ -744,7 +748,6 @@ static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
 	 * break this.
 	 */
 	tsk->files = NULL;
-	error = -ENOMEM;
 	newf = dup_fd(oldf, &error);
 	if (!newf)
 		goto out;
@@ -871,6 +874,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
 		tsk->it_prof_expires =
 			secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
 	}
+	acct_init_pacct(&sig->pacct);
 
 	return 0;
 }
@@ -909,6 +913,15 @@ asmlinkage long sys_set_tid_address(int __user *tidptr)
 	return current->pid;
 }
 
+static inline void rt_mutex_init_task(struct task_struct *p)
+{
+#ifdef CONFIG_RT_MUTEXES
+	spin_lock_init(&p->pi_lock);
+	plist_head_init(&p->pi_waiters, &p->pi_lock);
+	p->pi_blocked_on = NULL;
+#endif
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.
@@ -955,6 +968,10 @@ static task_t *copy_process(unsigned long clone_flags,
 	if (!p)
 		goto fork_out;
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+	DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
+	DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
+#endif
 	retval = -EAGAIN;
 	if (atomic_read(&p->user->processes) >=
 			p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
@@ -989,13 +1006,10 @@ static task_t *copy_process(unsigned long clone_flags,
 		if (put_user(p->pid, parent_tidptr))
 			goto bad_fork_cleanup;
 
-	p->proc_dentry = NULL;
-
 	INIT_LIST_HEAD(&p->children);
 	INIT_LIST_HEAD(&p->sibling);
 	p->vfork_done = NULL;
 	spin_lock_init(&p->alloc_lock);
-	spin_lock_init(&p->proc_lock);
 
 	clear_tsk_thread_flag(p, TIF_SIGPENDING);
 	init_sigpending(&p->pending);
@@ -1032,6 +1046,28 @@ static task_t *copy_process(unsigned long clone_flags,
  	}
 	mpol_fix_fork_child_flag(p);
 #endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+	p->irq_events = 0;
+	p->hardirqs_enabled = 0;
+	p->hardirq_enable_ip = 0;
+	p->hardirq_enable_event = 0;
+	p->hardirq_disable_ip = _THIS_IP_;
+	p->hardirq_disable_event = 0;
+	p->softirqs_enabled = 1;
+	p->softirq_enable_ip = _THIS_IP_;
+	p->softirq_enable_event = 0;
+	p->softirq_disable_ip = 0;
+	p->softirq_disable_event = 0;
+	p->hardirq_context = 0;
+	p->softirq_context = 0;
+#endif
+#ifdef CONFIG_LOCKDEP
+	p->lockdep_depth = 0; /* no locks held yet */
+	p->curr_chain_key = 0;
+	p->lockdep_recursion = 0;
+#endif
+
+	rt_mutex_init_task(p);
 
 #ifdef CONFIG_DEBUG_MUTEXES
 	p->blocked_on = NULL; /* not blocked yet */
@@ -1075,6 +1111,9 @@ static task_t *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_COMPAT
 	p->compat_robust_list = NULL;
 #endif
+	INIT_LIST_HEAD(&p->pi_state_list);
+	p->pi_state_cache = NULL;
+
 	/*
 	 * sigaltstack should be cleared when sharing the same VM
 	 */
@@ -1155,18 +1194,6 @@ static task_t *copy_process(unsigned long clone_flags,
 	}
 
 	if (clone_flags & CLONE_THREAD) {
-		/*
-		 * Important: if an exit-all has been started then
-		 * do not create this new thread - the whole thread
-		 * group is supposed to exit anyway.
-		 */
-		if (current->signal->flags & SIGNAL_GROUP_EXIT) {
-			spin_unlock(&current->sighand->siglock);
-			write_unlock_irq(&tasklist_lock);
-			retval = -EAGAIN;
-			goto bad_fork_cleanup_namespace;
-		}
-
 		p->group_leader = current->group_leader;
 		list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);