pidns: use kzalloc when allocating new pid_namespace struct

It makes many fields initialization implicit helping in auto-setting
#ifdef-ed fields (bsd-acct related pointer will be such).

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 98702b4..06331cc 100644 (file)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -71,7 +71,7 @@ static struct pid_namespace *create_pid_namespace(unsigned int level)
        struct pid_namespace *ns;
        int i;
 
-       ns = kmem_cache_alloc(pid_ns_cachep, GFP_KERNEL);
+       ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);
        if (ns == NULL)
                goto out;
 
@@ -84,17 +84,13 @@ static struct pid_namespace *create_pid_namespace(unsigned int level)
                goto out_free_map;
 
        kref_init(&ns->kref);
-       ns->last_pid = 0;
-       ns->child_reaper = NULL;
        ns->level = level;
 
        set_bit(0, ns->pidmap[0].page);
        atomic_set(&ns->pidmap[0].nr_free, BITS_PER_PAGE - 1);
 
-       for (i = 1; i < PIDMAP_ENTRIES; i++) {
-               ns->pidmap[i].page = NULL;
+       for (i = 1; i < PIDMAP_ENTRIES; i++)
                atomic_set(&ns->pidmap[i].nr_free, BITS_PER_PAGE);
-       }
 
        return ns;