The patch titled
memrlimit-setup-the-memrlimit-controller-mm_owner-fix
has been removed from the -mm tree. Its filename was
memrlimit-setup-the-memrlimit-controller-mm_owner-fix.patch
This patch was dropped because it was folded into memrlimit-setup-the-memrlimit-controller.patch
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: memrlimit-setup-the-memrlimit-controller-mm_owner-fix
From: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> and
Li Zefan <lizf@xxxxxxxxxxxxxx>
This patch allows mm->owner to be NULL when mm_owner callback is called.
Without this patch, (for example) you can see panic while you do migrate
a set of task, which calls fork/exit.
Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cgroup.c | 5 +++--
kernel/exit.c | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)
diff -puN kernel/cgroup.c~memrlimit-setup-the-memrlimit-controller-mm_owner-fix kernel/cgroup.c
--- a/kernel/cgroup.c~memrlimit-setup-the-memrlimit-controller-mm_owner-fix
+++ a/kernel/cgroup.c
@@ -2761,13 +2761,14 @@ void cgroup_fork_callbacks(struct task_s
*/
void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
{
- struct cgroup *oldcgrp, *newcgrp = NULL;
+ struct cgroup *oldcgrp = NULL, *newcgrp = NULL;
if (need_mm_owner_callback) {
int i;
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
struct cgroup_subsys *ss = subsys[i];
- oldcgrp = task_cgroup(old, ss->subsys_id);
+ if (old)
+ oldcgrp = task_cgroup(old, ss->subsys_id);
if (new)
newcgrp = task_cgroup(new, ss->subsys_id);
if (oldcgrp == newcgrp)
diff -puN kernel/exit.c~memrlimit-setup-the-memrlimit-controller-mm_owner-fix kernel/exit.c
--- a/kernel/exit.c~memrlimit-setup-the-memrlimit-controller-mm_owner-fix
+++ a/kernel/exit.c
@@ -641,8 +641,8 @@ retry:
* the callback and take action
*/
down_write(&mm->mmap_sem);
- cgroup_mm_owner_callbacks(mm->owner, NULL);
mm->owner = NULL;
+ cgroup_mm_owner_callbacks(mm->owner, NULL);
up_write(&mm->mmap_sem);
return;
_
Patches currently in -mm which might be from balbir@xxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
memrlimit-add-memrlimit-controller-documentation.patch
memrlimit-setup-the-memrlimit-controller.patch
memrlimit-setup-the-memrlimit-controller-mm_owner-fix.patch
memrlimit-add-memrlimit-controller-accounting-and-control.patch
memrlimit-add-memrlimit-controller-accounting-and-control-memory-rlimit-enhance-mm_owner_changed-callback-to-deal-with-exited-owner.patch
memrlimit-add-memrlimit-controller-accounting-and-control-mm_owner-fix.patch
memrlimit-add-memrlimit-controller-accounting-and-control-mm_owner-fix-checkpatch-fixes.patch
memrlimit-add-memrlimit-controller-accounting-and-control-memory-rlimit-fix-crash-on-fork.patch
memrlimit-add-memrlimit-controller-accounting-and-control-fix-task_lock-recursive-locking-v2.patch
memrlimit-improve-error-handling.patch
memrlimit-improve-error-handling-update.patch
memrlimit-handle-attach_task-failure-add-can_attach-callback.patch
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