X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=kernel%2Ffork.c;h=b6cce14ba0470e641bd45c68ca2067c4ee70d38c;hb=b829e011f6f9eed8c4dd41eaf02bdbb3a3ad837f;hp=7701470ea1b8222eb5990a016b85fc8526d3d55f;hpb=97101eb41d0d3c97543878ce40e0b8a8b2747ed7;p=net-next-2.6.git

diff --git a/kernel/fork.c b/kernel/fork.c
index 7701470ea1b..b6cce14ba04 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -877,9 +877,9 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	if (!sig)
 		return -ENOMEM;
 
-	atomic_set(&sig->sigcnt, 1);
-	atomic_set(&sig->count, 1);
+	sig->nr_threads = 1;
 	atomic_set(&sig->live, 1);
+	atomic_set(&sig->sigcnt, 1);
 	init_waitqueue_head(&sig->wait_chldexit);
 	if (clone_flags & CLONE_NEWPID)
 		sig->flags |= SIGNAL_UNKILLABLE;
@@ -1086,10 +1086,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
  	}
 	mpol_fix_fork_child_flag(p);
 #endif
-#ifdef CONFIG_CPUSETS
-	p->cpuset_mem_spread_rotor = node_random(p->mems_allowed);
-	p->cpuset_slab_spread_rotor = node_random(p->mems_allowed);
-#endif
 #ifdef CONFIG_TRACE_IRQFLAGS
 	p->irq_events = 0;
 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
@@ -1256,9 +1252,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	}
 
 	if (clone_flags & CLONE_THREAD) {
-		atomic_inc(&current->signal->sigcnt);
-		atomic_inc(&current->signal->count);
+		current->signal->nr_threads++;
 		atomic_inc(&current->signal->live);
+		atomic_inc(&current->signal->sigcnt);
 		p->group_leader = current->group_leader;
 		list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
 	}
@@ -1338,6 +1334,16 @@ noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_re
 	return regs;
 }
 
+static inline void init_idle_pids(struct pid_link *links)
+{
+	enum pid_type type;
+
+	for (type = PIDTYPE_PID; type < PIDTYPE_MAX; ++type) {
+		INIT_HLIST_NODE(&links[type].node); /* not really needed */
+		links[type].pid = &init_struct_pid;
+	}
+}
+
 struct task_struct * __cpuinit fork_idle(int cpu)
 {
 	struct task_struct *task;
@@ -1345,8 +1351,10 @@ struct task_struct * __cpuinit fork_idle(int cpu)
 
 	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL,
 			    &init_struct_pid, 0);
-	if (!IS_ERR(task))
+	if (!IS_ERR(task)) {
+		init_idle_pids(task->pids);
 		init_idle(task, cpu);
+	}
 
 	return task;
 }
@@ -1517,14 +1525,6 @@ static void check_unshare_flags(unsigned long *flags_ptr)
 	if (*flags_ptr & CLONE_VM)
 		*flags_ptr |= CLONE_SIGHAND;
 
-	/*
-	 * If unsharing signal handlers and the task was created
-	 * using CLONE_THREAD, then must unshare the thread
-	 */
-	if ((*flags_ptr & CLONE_SIGHAND) &&
-	    (atomic_read(&current->signal->count) > 1))
-		*flags_ptr |= CLONE_THREAD;
-
 	/*
 	 * If unsharing namespace, must also unshare filesystem information.
 	 */