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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  rcu: create rcu_my_thread_group_empty() wrapper
  memcg: css_id() must be called under rcu_read_lock()
  cgroup: Check task_lock in task_subsys_state()
  sched: Fix an RCU warning in print_task()
  cgroup: Fix an RCU warning in alloc_css_id()
  cgroup: Fix an RCU warning in cgroup_path()
  KEYS: Fix an RCU warning in the reading of user keys
  KEYS: Fix an RCU warning
This commit is contained in:
Linus Torvalds
2010-05-07 13:58:21 -07:00
parent e8e8fade7b ee84b8243b
commit 91bc482ec5
6 changed files with 43 additions and 10 deletions
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21
mm/memcontrol.c
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@@ -811,10 +811,12 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
* enabled in "curr" and "curr" is a child of "mem" in *cgroup*
* hierarchy(even if use_hierarchy is disabled in "mem").
*/
rcu_read_lock();
if (mem->use_hierarchy)
ret = css_is_ancestor(&curr->css, &mem->css);
else
ret = (curr == mem);
rcu_read_unlock();
css_put(&curr->css);
return ret;
}
@@ -2312,7 +2314,9 @@ mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
/* record memcg information */
if (do_swap_account && swapout && memcg) {
rcu_read_lock();
swap_cgroup_record(ent, css_id(&memcg->css));
rcu_read_unlock();
mem_cgroup_get(memcg);
}
if (swapout && memcg)
@@ -2369,8 +2373,10 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry,
{
unsigned short old_id, new_id;
rcu_read_lock();
old_id = css_id(&from->css);
new_id = css_id(&to->css);
rcu_read_unlock();
if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
mem_cgroup_swap_statistics(from, false);
@@ -4038,11 +4044,16 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
put_page(page);
}
/* throught */
if (ent.val && do_swap_account && !ret &&
css_id(&mc.from->css) == lookup_swap_cgroup(ent)) {
ret = MC_TARGET_SWAP;
if (target)
target->ent = ent;
if (ent.val && do_swap_account && !ret) {
unsigned short id;
rcu_read_lock();
id = css_id(&mc.from->css);
rcu_read_unlock();
if (id == lookup_swap_cgroup(ent)) {
ret = MC_TARGET_SWAP;
if (target)
target->ent = ent;
}
}
return ret;
}