bsdacct: fix and add comments around acct_process()

Fix the one describing what this function is and add one more - about
locking absence around pid namespaces loop.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/acct.c b/kernel/acct.c
index 0feba97e114e..dd68b9059418 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -657,7 +657,8 @@ static void acct_process_in_ns(struct pid_namespace *ns)
 }
 
 /**
- * acct_process - now just a wrapper around do_acct_process
+ * acct_process - now just a wrapper around acct_process_in_ns,
+ * which in turn is a wrapper around do_acct_process.
  *
  * handles process accounting for an exiting task
  */
@@ -665,6 +666,11 @@ void acct_process(void)
 {
         struct pid_namespace *ns;
 
+        /*
+         * This loop is safe lockless, since current is still
+         * alive and holds its namespace, which in turn holds
+         * its parent.
+         */
         for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent)
                 acct_process_in_ns(ns);
 }