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bsdacct: fix and add comments around acct_process()

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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>
This commit is contained in:
Pavel Emelyanov 2008-07-25 01:48:49 -07:00 committed by Linus Torvalds
parent 7d1e13505b
commit 0c18d7a5df
1 changed files with 7 additions and 1 deletions
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8
kernel/acct.c
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@ -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 * handles process accounting for an exiting task
*/ */
@ -665,6 +666,11 @@ void acct_process(void)
{ {
struct pid_namespace *ns; 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) for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent)
acct_process_in_ns(ns); acct_process_in_ns(ns);
} }