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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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kernel/cgroup.c
+11 -5
View File
@@ -1646,7 +1646,9 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
{
char *start;
struct dentry *dentry = rcu_dereference(cgrp->dentry);
struct dentry *dentry = rcu_dereference_check(cgrp->dentry,
rcu_read_lock_held() ||
cgroup_lock_is_held());
if (!dentry || cgrp == dummytop) {
/*
@@ -1662,13 +1664,17 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
*--start = '\0';
for (;;) {
int len = dentry->d_name.len;
if ((start -= len) < buf)
return -ENAMETOOLONG;
memcpy(start, cgrp->dentry->d_name.name, len);
memcpy(start, dentry->d_name.name, len);
cgrp = cgrp->parent;
if (!cgrp)
break;
dentry = rcu_dereference(cgrp->dentry);
dentry = rcu_dereference_check(cgrp->dentry,
rcu_read_lock_held() ||
cgroup_lock_is_held());
if (!cgrp->parent)
continue;
if (--start < buf)
@@ -4555,13 +4561,13 @@ static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent,
{
int subsys_id, i, depth = 0;
struct cgroup_subsys_state *parent_css, *child_css;
struct css_id *child_id, *parent_id = NULL;
struct css_id *child_id, *parent_id;
subsys_id = ss->subsys_id;
parent_css = parent->subsys[subsys_id];
child_css = child->subsys[subsys_id];
depth = css_depth(parent_css) + 1;
parent_id = parent_css->id;
depth = parent_id->depth;
child_id = get_new_cssid(ss, depth);
if (IS_ERR(child_id))
kernel/rcupdate.c
+11
View File
@@ -122,3 +122,14 @@ void wakeme_after_rcu(struct rcu_head *head)
rcu = container_of(head, struct rcu_synchronize, head);
complete(&rcu->completion);
}
#ifdef CONFIG_PROVE_RCU
/*
* wrapper function to avoid #include problems.
*/
int rcu_my_thread_group_empty(void)
{
return thread_group_empty(current);
}
EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
#endif /* #ifdef CONFIG_PROVE_RCU */
kernel/sched_debug.c
+2
View File
@@ -114,7 +114,9 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
{
char path[64];
rcu_read_lock();
cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
rcu_read_unlock();
SEQ_printf(m, " %s", path);
}
#endif