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Merge branch 'for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

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Pull cgroup updates from Tejun Heo:
 "Nothing major. Two notable fixes are Li's second stab at fixing the
  long-standing race condition in the mount path and suppression of
  spurious warning from cgroup_get(). All other changes are trivial"

* 'for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: mark cgroup_get() with __maybe_unused
  cgroup: avoid attaching a cgroup root to two different superblocks, take 2
  cgroup: fix spurious warnings on cgroup_is_dead() from cgroup_sk_alloc()
  cgroup: move cgroup_subsys_state parent field for cache locality
  cpuset: Remove cpuset_update_active_cpus()'s parameter.
  cgroup: switch to BUG_ON()
  cgroup: drop duplicate header nsproxy.h
  kernel: convert css_set.refcount from atomic_t to refcount_t
  kernel: convert cgroup_namespace.count from atomic_t to refcount_t
This commit is contained in:
Linus Torvalds
2017-05-01 13:52:24 -07:00
parent ad1490bcd2 310b4816a5
commit 9410091dd5
9 changed files with 67 additions and 41 deletions
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8
include/linux/cgroup.h
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@@ -17,11 +17,11 @@
#include <linux/seq_file.h>
#include <linux/kernfs.h>
#include <linux/jump_label.h>
#include <linux/nsproxy.h>
#include <linux/types.h>
#include <linux/ns_common.h>
#include <linux/nsproxy.h>
#include <linux/user_namespace.h>
#include <linux/refcount.h>
#include <linux/cgroup-defs.h>
@@ -661,7 +661,7 @@ static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
#endif /* CONFIG_CGROUP_DATA */
struct cgroup_namespace {
atomic_t count;
refcount_t count;
struct ns_common ns;
struct user_namespace *user_ns;
struct ucounts *ucounts;
@@ -696,12 +696,12 @@ copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
static inline void get_cgroup_ns(struct cgroup_namespace *ns)
{
if (ns)
atomic_inc(&ns->count);
refcount_inc(&ns->count);
}
static inline void put_cgroup_ns(struct cgroup_namespace *ns)
{
if (ns && atomic_dec_and_test(&ns->count))
if (ns && refcount_dec_and_test(&ns->count))
free_cgroup_ns(ns);
}