Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...

Pull cgroup fixes from Tejun Heo:
 "Quite a few fixes this time.

  Three locking fixes, all marked for -stable.  A couple error path
  fixes and some misc fixes.  Hugh found a bug in memcg offlining
  sequence and we thought we could fix that from cgroup core side but
  that turned out to be insufficient and got reverted.  A different fix
  has been applied to -mm"

* 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: update cgroup_enable_task_cg_lists() to grab siglock
  Revert "cgroup: use an ordered workqueue for cgroup destruction"
  cgroup: protect modifications to cgroup_idr with cgroup_mutex
  cgroup: fix locking in cgroup_cfts_commit()
  cgroup: fix error return from cgroup_create()
  cgroup: fix error return value in cgroup_mount()
  cgroup: use an ordered workqueue for cgroup destruction
  nfs: include xattr.h from fs/nfs/nfs3proc.c
  cpuset: update MAINTAINERS entry
  arm, pm, vmpressure: add missing slab.h includes

diff --git a/MAINTAINERS b/MAINTAINERS
index 0dba50b405d64285aafaeafc6630bcbdd2e7d8a6..2225bb91afcc5c7450f4b757ba129f57961f2b2f 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2408,8 +2408,10 @@ F:       tools/power/cpupower/
 
 CPUSETS
 M:     Li Zefan <lizefan@huawei.com>
+L:     cgroups@vger.kernel.org
 W:     http://www.bullopensource.org/cpuset/
 W:     http://oss.sgi.com/projects/cpusets/
+T:     git git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
 S:     Maintained
 F:     Documentation/cgroups/cpusets.txt
 F:     include/linux/cpuset.h

diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 4ae0286b468db6209311d14d13cd9cc673fb200b..f55b05a29b55f3ed655b36b1edf1f93f85d09c9d 100644 (file)
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -24,6 +24,7 @@
 #include <linux/cpu_pm.h>
 #include <linux/suspend.h>
 #include <linux/err.h>
+#include <linux/slab.h>
 #include <linux/clk/tegra.h>
 
 #include <asm/smp_plat.h>

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index aa9bc973f36a31eacbca297c71f2cd9bb5fb81e9..a462ef0fb5d6dcda8bab6f211e8122d7d972b070 100644 (file)
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -18,6 +18,7 @@
 #include <linux/lockd/bind.h>
 #include <linux/nfs_mount.h>
 #include <linux/freezer.h>
+#include <linux/xattr.h>
 
 #include "iostat.h"
 #include "internal.h"

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 5c097596104b80535a0a00bdd45b4a2441fac889..9450f025fe0c01ac52bf78caccf114c30312a2e4 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -166,6 +166,8 @@ struct cgroup {
         *
         * The ID of the root cgroup is always 0, and a new cgroup
         * will be assigned with a smallest available ID.
+        *
+        * Allocating/Removing ID must be protected by cgroup_mutex.
         */
        int id;
 

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e2f46ba37f7243c4278de77a8c8536ddc4c0aad5..105f273b6f86a74984d2b62b7d3ba19f95369a78 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -886,7 +886,9 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
                 * per-subsystem and moved to css->id so that lookups are
                 * successful until the target css is released.
                 */
+               mutex_lock(&cgroup_mutex);
                idr_remove(&cgrp->root->cgroup_idr, cgrp->id);
+               mutex_unlock(&cgroup_mutex);
                cgrp->id = -1;
 
                call_rcu(&cgrp->rcu_head, cgroup_free_rcu);
@@ -1566,10 +1568,10 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
                mutex_lock(&cgroup_mutex);
                mutex_lock(&cgroup_root_mutex);
 
-               root_cgrp->id = idr_alloc(&root->cgroup_idr, root_cgrp,
-                                          0, 1, GFP_KERNEL);
-               if (root_cgrp->id < 0)
+               ret = idr_alloc(&root->cgroup_idr, root_cgrp, 0, 1, GFP_KERNEL);
+               if (ret < 0)
                        goto unlock_drop;
+               root_cgrp->id = ret;
 
                /* Check for name clashes with existing mounts */
                ret = -EBUSY;
@@ -2763,10 +2765,7 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
         */
        update_before = cgroup_serial_nr_next;
 
-       mutex_unlock(&cgroup_mutex);
-
        /* add/rm files for all cgroups created before */
-       rcu_read_lock();
        css_for_each_descendant_pre(css, cgroup_css(root, ss)) {
                struct cgroup *cgrp = css->cgroup;
 
@@ -2775,23 +2774,19 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
 
                inode = cgrp->dentry->d_inode;
                dget(cgrp->dentry);
-               rcu_read_unlock();
-
                dput(prev);
                prev = cgrp->dentry;
 
+               mutex_unlock(&cgroup_mutex);
                mutex_lock(&inode->i_mutex);
                mutex_lock(&cgroup_mutex);
                if (cgrp->serial_nr < update_before && !cgroup_is_dead(cgrp))
                        ret = cgroup_addrm_files(cgrp, cfts, is_add);
-               mutex_unlock(&cgroup_mutex);
                mutex_unlock(&inode->i_mutex);
-
-               rcu_read_lock();
                if (ret)
                        break;
        }
-       rcu_read_unlock();
+       mutex_unlock(&cgroup_mutex);
        dput(prev);
        deactivate_super(sb);
        return ret;
@@ -2910,9 +2905,14 @@ static void cgroup_enable_task_cg_lists(void)
                 * We should check if the process is exiting, otherwise
                 * it will race with cgroup_exit() in that the list
                 * entry won't be deleted though the process has exited.
+                * Do it while holding siglock so that we don't end up
+                * racing against cgroup_exit().
                 */
+               spin_lock_irq(&p->sighand->siglock);
                if (!(p->flags & PF_EXITING) && list_empty(&p->cg_list))
                        list_add(&p->cg_list, &task_css_set(p)->tasks);
+               spin_unlock_irq(&p->sighand->siglock);
+
                task_unlock(p);
        } while_each_thread(g, p);
        read_unlock(&tasklist_lock);
@@ -4158,7 +4158,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
        struct cgroup *cgrp;
        struct cgroup_name *name;
        struct cgroupfs_root *root = parent->root;
-       int ssid, err = 0;
+       int ssid, err;
        struct cgroup_subsys *ss;
        struct super_block *sb = root->sb;
 
@@ -4168,18 +4168,12 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
                return -ENOMEM;
 
        name = cgroup_alloc_name(dentry);
-       if (!name)
+       if (!name) {
+               err = -ENOMEM;
                goto err_free_cgrp;
+       }
        rcu_assign_pointer(cgrp->name, name);
 
-       /*
-        * Temporarily set the pointer to NULL, so idr_find() won't return
-        * a half-baked cgroup.
-        */
-       cgrp->id = idr_alloc(&root->cgroup_idr, NULL, 1, 0, GFP_KERNEL);
-       if (cgrp->id < 0)
-               goto err_free_name;
-
        /*
         * Only live parents can have children.  Note that the liveliness
         * check isn't strictly necessary because cgroup_mkdir() and
@@ -4189,7 +4183,17 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
         */
        if (!cgroup_lock_live_group(parent)) {
                err = -ENODEV;
-               goto err_free_id;
+               goto err_free_name;
+       }
+
+       /*
+        * Temporarily set the pointer to NULL, so idr_find() won't return
+        * a half-baked cgroup.
+        */
+       cgrp->id = idr_alloc(&root->cgroup_idr, NULL, 1, 0, GFP_KERNEL);
+       if (cgrp->id < 0) {
+               err = -ENOMEM;
+               goto err_unlock;
        }
 
        /* Grab a reference on the superblock so the hierarchy doesn't
@@ -4221,7 +4225,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
         */
        err = cgroup_create_file(dentry, S_IFDIR | mode, sb);
        if (err < 0)
-               goto err_unlock;
+               goto err_free_id;
        lockdep_assert_held(&dentry->d_inode->i_mutex);
 
        cgrp->serial_nr = cgroup_serial_nr_next++;
@@ -4257,12 +4261,12 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
        return 0;
 
-err_unlock:
-       mutex_unlock(&cgroup_mutex);
-       /* Release the reference count that we took on the superblock */
-       deactivate_super(sb);
 err_free_id:
        idr_remove(&root->cgroup_idr, cgrp->id);
+       /* Release the reference count that we took on the superblock */
+       deactivate_super(sb);
+err_unlock:
+       mutex_unlock(&cgroup_mutex);
 err_free_name:
        kfree(rcu_dereference_raw(cgrp->name));
 err_free_cgrp:

diff --git a/kernel/power/console.c b/kernel/power/console.c
index eacb8bd8cab4e1205230ecfdde12483be9846cf7..aba9c545a0e3940481f3b5ce54221906edb760e2 100644 (file)
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -9,6 +9,7 @@
 #include <linux/kbd_kern.h>
 #include <linux/vt.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include "power.h"
 
 #define SUSPEND_CONSOLE        (MAX_NR_CONSOLES-1)

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 196970a4541f0c07108eff49b7cb8d12fd930b06..d4042e75f7c7e7c7d498c4fcc33c90f1d1de2bff 100644 (file)
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -19,6 +19,7 @@
 #include <linux/mm.h>
 #include <linux/vmstat.h>
 #include <linux/eventfd.h>
+#include <linux/slab.h>
 #include <linux/swap.h>
 #include <linux/printk.h>
 #include <linux/vmpressure.h>