The patch titled
bsdacct: fix and add comments around acct_process()
has been added to the -mm tree. Its filename is
bsdacct-stir-up-comments-around-acct_process.patch
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------------------------------------------------------
Subject: bsdacct: fix and add comments around acct_process()
From: Pavel Emelyanov <xemul@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/acct.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN kernel/acct.c~bsdacct-stir-up-comments-around-acct_process kernel/acct.c
--- a/kernel/acct.c~bsdacct-stir-up-comments-around-acct_process
+++ a/kernel/acct.c
@@ -657,7 +657,8 @@ static void acct_process_in_ns(struct pi
}
/**
- * 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);
}
_
Patches currently in -mm which might be from xemul@xxxxxxxxxx are
mark-res_counter_charge_locked-with-__must_check.patch
memcg-make-global-var-read_mostly.patch
memcg-avoid-unnecessary-initialization.patch
memcg-better-migration-handling.patch
memcg-remove-refcnt-from-page_cgroup.patch
memcg-handle-swap-cache.patch
memcg-helper-function-for-relcaim-from-shmem.patch
memcg-add-hints-for-branch.patch
memcg-remove-a-redundant-check.patch
bsdacct-rename-acct_blbls-to-bsd_acct_struct.patch
pidns-use-kzalloc-when-allocating-new-pid_namespace-struct.patch
pidns-add-the-struct-bsd_acct_struct-pointer-on-pid_namespace-struct.patch
bsdacct-truthify-a-comment-near-acct_process.patch
bsdacct-make-check-timer-accept-a-bsd_acct_struct-argument.patch
bsdacct-turn-the-acct_lock-from-on-the-struct-to-global.patch
bsdacct-make-internal-code-work-with-passed-bsd_acct_struct-not-global.patch
bsdacct-switch-from-global-bsd_acct_struct-instance-to-per-pidns-one.patch
bsdacct-turn-acct-off-for-all-pidns-s-on-umount-time.patch
bsdacct-account-dying-tasks-in-all-relevant-namespaces.patch
bsdacct-stir-up-comments-around-acct_process.patch
reiser4.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
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