linux/include/linux/cgroup.h
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   1#ifndef _LINUX_CGROUP_H
   2#define _LINUX_CGROUP_H
   3/*
   4 *  cgroup interface
   5 *
   6 *  Copyright (C) 2003 BULL SA
   7 *  Copyright (C) 2004-2006 Silicon Graphics, Inc.
   8 *
   9 */
  10
  11#include <linux/sched.h>
  12#include <linux/cpumask.h>
  13#include <linux/nodemask.h>
  14#include <linux/rcupdate.h>
  15#include <linux/cgroupstats.h>
  16#include <linux/prio_heap.h>
  17#include <linux/rwsem.h>
  18#include <linux/idr.h>
  19#include <linux/workqueue.h>
  20
  21#ifdef CONFIG_CGROUPS
  22
  23struct cgroupfs_root;
  24struct cgroup_subsys;
  25struct inode;
  26struct cgroup;
  27struct css_id;
  28
  29extern int cgroup_init_early(void);
  30extern int cgroup_init(void);
  31extern void cgroup_lock(void);
  32extern int cgroup_lock_is_held(void);
  33extern bool cgroup_lock_live_group(struct cgroup *cgrp);
  34extern void cgroup_unlock(void);
  35extern void cgroup_fork(struct task_struct *p);
  36extern void cgroup_fork_callbacks(struct task_struct *p);
  37extern void cgroup_post_fork(struct task_struct *p);
  38extern void cgroup_exit(struct task_struct *p, int run_callbacks);
  39extern int cgroupstats_build(struct cgroupstats *stats,
  40                                struct dentry *dentry);
  41extern int cgroup_load_subsys(struct cgroup_subsys *ss);
  42extern void cgroup_unload_subsys(struct cgroup_subsys *ss);
  43
  44extern const struct file_operations proc_cgroup_operations;
  45
  46/* Define the enumeration of all builtin cgroup subsystems */
  47#define SUBSYS(_x) _x ## _subsys_id,
  48enum cgroup_subsys_id {
  49#include <linux/cgroup_subsys.h>
  50        CGROUP_BUILTIN_SUBSYS_COUNT
  51};
  52#undef SUBSYS
  53/*
  54 * This define indicates the maximum number of subsystems that can be loaded
  55 * at once. We limit to this many since cgroupfs_root has subsys_bits to keep
  56 * track of all of them.
  57 */
  58#define CGROUP_SUBSYS_COUNT (BITS_PER_BYTE*sizeof(unsigned long))
  59
  60/* Per-subsystem/per-cgroup state maintained by the system. */
  61struct cgroup_subsys_state {
  62        /*
  63         * The cgroup that this subsystem is attached to. Useful
  64         * for subsystems that want to know about the cgroup
  65         * hierarchy structure
  66         */
  67        struct cgroup *cgroup;
  68
  69        /*
  70         * State maintained by the cgroup system to allow subsystems
  71         * to be "busy". Should be accessed via css_get(),
  72         * css_tryget() and and css_put().
  73         */
  74
  75        atomic_t refcnt;
  76
  77        unsigned long flags;
  78        /* ID for this css, if possible */
  79        struct css_id __rcu *id;
  80
  81        /* Used to put @cgroup->dentry on the last css_put() */
  82        struct work_struct dput_work;
  83};
  84
  85/* bits in struct cgroup_subsys_state flags field */
  86enum {
  87        CSS_ROOT, /* This CSS is the root of the subsystem */
  88        CSS_REMOVED, /* This CSS is dead */
  89        CSS_CLEAR_CSS_REFS,             /* @ss->__DEPRECATED_clear_css_refs */
  90};
  91
  92/* Caller must verify that the css is not for root cgroup */
  93static inline void __css_get(struct cgroup_subsys_state *css, int count)
  94{
  95        atomic_add(count, &css->refcnt);
  96}
  97
  98/*
  99 * Call css_get() to hold a reference on the css; it can be used
 100 * for a reference obtained via:
 101 * - an existing ref-counted reference to the css
 102 * - task->cgroups for a locked task
 103 */
 104
 105static inline void css_get(struct cgroup_subsys_state *css)
 106{
 107        /* We don't need to reference count the root state */
 108        if (!test_bit(CSS_ROOT, &css->flags))
 109                __css_get(css, 1);
 110}
 111
 112static inline bool css_is_removed(struct cgroup_subsys_state *css)
 113{
 114        return test_bit(CSS_REMOVED, &css->flags);
 115}
 116
 117/*
 118 * Call css_tryget() to take a reference on a css if your existing
 119 * (known-valid) reference isn't already ref-counted. Returns false if
 120 * the css has been destroyed.
 121 */
 122
 123extern bool __css_tryget(struct cgroup_subsys_state *css);
 124static inline bool css_tryget(struct cgroup_subsys_state *css)
 125{
 126        if (test_bit(CSS_ROOT, &css->flags))
 127                return true;
 128        return __css_tryget(css);
 129}
 130
 131/*
 132 * css_put() should be called to release a reference taken by
 133 * css_get() or css_tryget()
 134 */
 135
 136extern void __css_put(struct cgroup_subsys_state *css);
 137static inline void css_put(struct cgroup_subsys_state *css)
 138{
 139        if (!test_bit(CSS_ROOT, &css->flags))
 140                __css_put(css);
 141}
 142
 143/* bits in struct cgroup flags field */
 144enum {
 145        /* Control Group is dead */
 146        CGRP_REMOVED,
 147        /*
 148         * Control Group has previously had a child cgroup or a task,
 149         * but no longer (only if CGRP_NOTIFY_ON_RELEASE is set)
 150         */
 151        CGRP_RELEASABLE,
 152        /* Control Group requires release notifications to userspace */
 153        CGRP_NOTIFY_ON_RELEASE,
 154        /*
 155         * A thread in rmdir() is wating for this cgroup.
 156         */
 157        CGRP_WAIT_ON_RMDIR,
 158        /*
 159         * Clone cgroup values when creating a new child cgroup
 160         */
 161        CGRP_CLONE_CHILDREN,
 162};
 163
 164struct cgroup {
 165        unsigned long flags;            /* "unsigned long" so bitops work */
 166
 167        /*
 168         * count users of this cgroup. >0 means busy, but doesn't
 169         * necessarily indicate the number of tasks in the cgroup
 170         */
 171        atomic_t count;
 172
 173        /*
 174         * We link our 'sibling' struct into our parent's 'children'.
 175         * Our children link their 'sibling' into our 'children'.
 176         */
 177        struct list_head sibling;       /* my parent's children */
 178        struct list_head children;      /* my children */
 179        struct list_head files;         /* my files */
 180
 181        struct cgroup *parent;          /* my parent */
 182        struct dentry __rcu *dentry;    /* cgroup fs entry, RCU protected */
 183
 184        /* Private pointers for each registered subsystem */
 185        struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
 186
 187        struct cgroupfs_root *root;
 188        struct cgroup *top_cgroup;
 189
 190        /*
 191         * List of cg_cgroup_links pointing at css_sets with
 192         * tasks in this cgroup. Protected by css_set_lock
 193         */
 194        struct list_head css_sets;
 195
 196        struct list_head allcg_node;    /* cgroupfs_root->allcg_list */
 197        struct list_head cft_q_node;    /* used during cftype add/rm */
 198
 199        /*
 200         * Linked list running through all cgroups that can
 201         * potentially be reaped by the release agent. Protected by
 202         * release_list_lock
 203         */
 204        struct list_head release_list;
 205
 206        /*
 207         * list of pidlists, up to two for each namespace (one for procs, one
 208         * for tasks); created on demand.
 209         */
 210        struct list_head pidlists;
 211        struct mutex pidlist_mutex;
 212
 213        /* For RCU-protected deletion */
 214        struct rcu_head rcu_head;
 215
 216        /* List of events which userspace want to receive */
 217        struct list_head event_list;
 218        spinlock_t event_list_lock;
 219};
 220
 221/*
 222 * A css_set is a structure holding pointers to a set of
 223 * cgroup_subsys_state objects. This saves space in the task struct
 224 * object and speeds up fork()/exit(), since a single inc/dec and a
 225 * list_add()/del() can bump the reference count on the entire cgroup
 226 * set for a task.
 227 */
 228
 229struct css_set {
 230
 231        /* Reference count */
 232        atomic_t refcount;
 233
 234        /*
 235         * List running through all cgroup groups in the same hash
 236         * slot. Protected by css_set_lock
 237         */
 238        struct hlist_node hlist;
 239
 240        /*
 241         * List running through all tasks using this cgroup
 242         * group. Protected by css_set_lock
 243         */
 244        struct list_head tasks;
 245
 246        /*
 247         * List of cg_cgroup_link objects on link chains from
 248         * cgroups referenced from this css_set. Protected by
 249         * css_set_lock
 250         */
 251        struct list_head cg_links;
 252
 253        /*
 254         * Set of subsystem states, one for each subsystem. This array
 255         * is immutable after creation apart from the init_css_set
 256         * during subsystem registration (at boot time) and modular subsystem
 257         * loading/unloading.
 258         */
 259        struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
 260
 261        /* For RCU-protected deletion */
 262        struct rcu_head rcu_head;
 263};
 264
 265/*
 266 * cgroup_map_cb is an abstract callback API for reporting map-valued
 267 * control files
 268 */
 269
 270struct cgroup_map_cb {
 271        int (*fill)(struct cgroup_map_cb *cb, const char *key, u64 value);
 272        void *state;
 273};
 274
 275/*
 276 * struct cftype: handler definitions for cgroup control files
 277 *
 278 * When reading/writing to a file:
 279 *      - the cgroup to use is file->f_dentry->d_parent->d_fsdata
 280 *      - the 'cftype' of the file is file->f_dentry->d_fsdata
 281 */
 282
 283/* cftype->flags */
 284#define CFTYPE_ONLY_ON_ROOT     (1U << 0)       /* only create on root cg */
 285#define CFTYPE_NOT_ON_ROOT      (1U << 1)       /* don't create onp root cg */
 286
 287#define MAX_CFTYPE_NAME         64
 288
 289struct cftype {
 290        /*
 291         * By convention, the name should begin with the name of the
 292         * subsystem, followed by a period.  Zero length string indicates
 293         * end of cftype array.
 294         */
 295        char name[MAX_CFTYPE_NAME];
 296        int private;
 297        /*
 298         * If not 0, file mode is set to this value, otherwise it will
 299         * be figured out automatically
 300         */
 301        umode_t mode;
 302
 303        /*
 304         * If non-zero, defines the maximum length of string that can
 305         * be passed to write_string; defaults to 64
 306         */
 307        size_t max_write_len;
 308
 309        /* CFTYPE_* flags */
 310        unsigned int flags;
 311
 312        int (*open)(struct inode *inode, struct file *file);
 313        ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,
 314                        struct file *file,
 315                        char __user *buf, size_t nbytes, loff_t *ppos);
 316        /*
 317         * read_u64() is a shortcut for the common case of returning a
 318         * single integer. Use it in place of read()
 319         */
 320        u64 (*read_u64)(struct cgroup *cgrp, struct cftype *cft);
 321        /*
 322         * read_s64() is a signed version of read_u64()
 323         */
 324        s64 (*read_s64)(struct cgroup *cgrp, struct cftype *cft);
 325        /*
 326         * read_map() is used for defining a map of key/value
 327         * pairs. It should call cb->fill(cb, key, value) for each
 328         * entry. The key/value pairs (and their ordering) should not
 329         * change between reboots.
 330         */
 331        int (*read_map)(struct cgroup *cont, struct cftype *cft,
 332                        struct cgroup_map_cb *cb);
 333        /*
 334         * read_seq_string() is used for outputting a simple sequence
 335         * using seqfile.
 336         */
 337        int (*read_seq_string)(struct cgroup *cont, struct cftype *cft,
 338                               struct seq_file *m);
 339
 340        ssize_t (*write)(struct cgroup *cgrp, struct cftype *cft,
 341                         struct file *file,
 342                         const char __user *buf, size_t nbytes, loff_t *ppos);
 343
 344        /*
 345         * write_u64() is a shortcut for the common case of accepting
 346         * a single integer (as parsed by simple_strtoull) from
 347         * userspace. Use in place of write(); return 0 or error.
 348         */
 349        int (*write_u64)(struct cgroup *cgrp, struct cftype *cft, u64 val);
 350        /*
 351         * write_s64() is a signed version of write_u64()
 352         */
 353        int (*write_s64)(struct cgroup *cgrp, struct cftype *cft, s64 val);
 354
 355        /*
 356         * write_string() is passed a nul-terminated kernelspace
 357         * buffer of maximum length determined by max_write_len.
 358         * Returns 0 or -ve error code.
 359         */
 360        int (*write_string)(struct cgroup *cgrp, struct cftype *cft,
 361                            const char *buffer);
 362        /*
 363         * trigger() callback can be used to get some kick from the
 364         * userspace, when the actual string written is not important
 365         * at all. The private field can be used to determine the
 366         * kick type for multiplexing.
 367         */
 368        int (*trigger)(struct cgroup *cgrp, unsigned int event);
 369
 370        int (*release)(struct inode *inode, struct file *file);
 371
 372        /*
 373         * register_event() callback will be used to add new userspace
 374         * waiter for changes related to the cftype. Implement it if
 375         * you want to provide this functionality. Use eventfd_signal()
 376         * on eventfd to send notification to userspace.
 377         */
 378        int (*register_event)(struct cgroup *cgrp, struct cftype *cft,
 379                        struct eventfd_ctx *eventfd, const char *args);
 380        /*
 381         * unregister_event() callback will be called when userspace
 382         * closes the eventfd or on cgroup removing.
 383         * This callback must be implemented, if you want provide
 384         * notification functionality.
 385         */
 386        void (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,
 387                        struct eventfd_ctx *eventfd);
 388};
 389
 390/*
 391 * cftype_sets describe cftypes belonging to a subsystem and are chained at
 392 * cgroup_subsys->cftsets.  Each cftset points to an array of cftypes
 393 * terminated by zero length name.
 394 */
 395struct cftype_set {
 396        struct list_head                node;   /* chained at subsys->cftsets */
 397        const struct cftype             *cfts;
 398};
 399
 400struct cgroup_scanner {
 401        struct cgroup *cg;
 402        int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);
 403        void (*process_task)(struct task_struct *p,
 404                        struct cgroup_scanner *scan);
 405        struct ptr_heap *heap;
 406        void *data;
 407};
 408
 409int cgroup_add_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
 410int cgroup_rm_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
 411
 412int cgroup_is_removed(const struct cgroup *cgrp);
 413
 414int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
 415
 416int cgroup_task_count(const struct cgroup *cgrp);
 417
 418/* Return true if cgrp is a descendant of the task's cgroup */
 419int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
 420
 421/*
 422 * When the subsys has to access css and may add permanent refcnt to css,
 423 * it should take care of racy conditions with rmdir(). Following set of
 424 * functions, is for stop/restart rmdir if necessary.
 425 * Because these will call css_get/put, "css" should be alive css.
 426 *
 427 *  cgroup_exclude_rmdir();
 428 *  ...do some jobs which may access arbitrary empty cgroup
 429 *  cgroup_release_and_wakeup_rmdir();
 430 *
 431 *  When someone removes a cgroup while cgroup_exclude_rmdir() holds it,
 432 *  it sleeps and cgroup_release_and_wakeup_rmdir() will wake him up.
 433 */
 434
 435void cgroup_exclude_rmdir(struct cgroup_subsys_state *css);
 436void cgroup_release_and_wakeup_rmdir(struct cgroup_subsys_state *css);
 437
 438/*
 439 * Control Group taskset, used to pass around set of tasks to cgroup_subsys
 440 * methods.
 441 */
 442struct cgroup_taskset;
 443struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset);
 444struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);
 445struct cgroup *cgroup_taskset_cur_cgroup(struct cgroup_taskset *tset);
 446int cgroup_taskset_size(struct cgroup_taskset *tset);
 447
 448/**
 449 * cgroup_taskset_for_each - iterate cgroup_taskset
 450 * @task: the loop cursor
 451 * @skip_cgrp: skip if task's cgroup matches this, %NULL to iterate through all
 452 * @tset: taskset to iterate
 453 */
 454#define cgroup_taskset_for_each(task, skip_cgrp, tset)                  \
 455        for ((task) = cgroup_taskset_first((tset)); (task);             \
 456             (task) = cgroup_taskset_next((tset)))                      \
 457                if (!(skip_cgrp) ||                                     \
 458                    cgroup_taskset_cur_cgroup((tset)) != (skip_cgrp))
 459
 460/*
 461 * Control Group subsystem type.
 462 * See Documentation/cgroups/cgroups.txt for details
 463 */
 464
 465struct cgroup_subsys {
 466        struct cgroup_subsys_state *(*create)(struct cgroup *cgrp);
 467        int (*pre_destroy)(struct cgroup *cgrp);
 468        void (*destroy)(struct cgroup *cgrp);
 469        int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
 470        void (*cancel_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
 471        void (*attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
 472        void (*fork)(struct task_struct *task);
 473        void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,
 474                     struct task_struct *task);
 475        void (*post_clone)(struct cgroup *cgrp);
 476        void (*bind)(struct cgroup *root);
 477
 478        int subsys_id;
 479        int active;
 480        int disabled;
 481        int early_init;
 482        /*
 483         * True if this subsys uses ID. ID is not available before cgroup_init()
 484         * (not available in early_init time.)
 485         */
 486        bool use_id;
 487
 488        /*
 489         * If %true, cgroup removal will try to clear css refs by retrying
 490         * ss->pre_destroy() until there's no css ref left.  This behavior
 491         * is strictly for backward compatibility and will be removed as
 492         * soon as the current user (memcg) is updated.
 493         *
 494         * If %false, ss->pre_destroy() can't fail and cgroup removal won't
 495         * wait for css refs to drop to zero before proceeding.
 496         */
 497        bool __DEPRECATED_clear_css_refs;
 498
 499#define MAX_CGROUP_TYPE_NAMELEN 32
 500        const char *name;
 501
 502        /*
 503         * Link to parent, and list entry in parent's children.
 504         * Protected by cgroup_lock()
 505         */
 506        struct cgroupfs_root *root;
 507        struct list_head sibling;
 508        /* used when use_id == true */
 509        struct idr idr;
 510        spinlock_t id_lock;
 511
 512        /* list of cftype_sets */
 513        struct list_head cftsets;
 514
 515        /* base cftypes, automatically [de]registered with subsys itself */
 516        struct cftype *base_cftypes;
 517        struct cftype_set base_cftset;
 518
 519        /* should be defined only by modular subsystems */
 520        struct module *module;
 521};
 522
 523#define SUBSYS(_x) extern struct cgroup_subsys _x ## _subsys;
 524#include <linux/cgroup_subsys.h>
 525#undef SUBSYS
 526
 527static inline struct cgroup_subsys_state *cgroup_subsys_state(
 528        struct cgroup *cgrp, int subsys_id)
 529{
 530        return cgrp->subsys[subsys_id];
 531}
 532
 533/*
 534 * function to get the cgroup_subsys_state which allows for extra
 535 * rcu_dereference_check() conditions, such as locks used during the
 536 * cgroup_subsys::attach() methods.
 537 */
 538#define task_subsys_state_check(task, subsys_id, __c)                   \
 539        rcu_dereference_check(task->cgroups->subsys[subsys_id],         \
 540                              lockdep_is_held(&task->alloc_lock) ||     \
 541                              cgroup_lock_is_held() || (__c))
 542
 543static inline struct cgroup_subsys_state *
 544task_subsys_state(struct task_struct *task, int subsys_id)
 545{
 546        return task_subsys_state_check(task, subsys_id, false);
 547}
 548
 549static inline struct cgroup* task_cgroup(struct task_struct *task,
 550                                               int subsys_id)
 551{
 552        return task_subsys_state(task, subsys_id)->cgroup;
 553}
 554
 555/* A cgroup_iter should be treated as an opaque object */
 556struct cgroup_iter {
 557        struct list_head *cg_link;
 558        struct list_head *task;
 559};
 560
 561/*
 562 * To iterate across the tasks in a cgroup:
 563 *
 564 * 1) call cgroup_iter_start to initialize an iterator
 565 *
 566 * 2) call cgroup_iter_next() to retrieve member tasks until it
 567 *    returns NULL or until you want to end the iteration
 568 *
 569 * 3) call cgroup_iter_end() to destroy the iterator.
 570 *
 571 * Or, call cgroup_scan_tasks() to iterate through every task in a
 572 * cgroup - cgroup_scan_tasks() holds the css_set_lock when calling
 573 * the test_task() callback, but not while calling the process_task()
 574 * callback.
 575 */
 576void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it);
 577struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
 578                                        struct cgroup_iter *it);
 579void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
 580int cgroup_scan_tasks(struct cgroup_scanner *scan);
 581int cgroup_attach_task(struct cgroup *, struct task_struct *);
 582int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
 583
 584/*
 585 * CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
 586 * if cgroup_subsys.use_id == true. It can be used for looking up and scanning.
 587 * CSS ID is assigned at cgroup allocation (create) automatically
 588 * and removed when subsys calls free_css_id() function. This is because
 589 * the lifetime of cgroup_subsys_state is subsys's matter.
 590 *
 591 * Looking up and scanning function should be called under rcu_read_lock().
 592 * Taking cgroup_mutex is not necessary for following calls.
 593 * But the css returned by this routine can be "not populated yet" or "being
 594 * destroyed". The caller should check css and cgroup's status.
 595 */
 596
 597/*
 598 * Typically Called at ->destroy(), or somewhere the subsys frees
 599 * cgroup_subsys_state.
 600 */
 601void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css);
 602
 603/* Find a cgroup_subsys_state which has given ID */
 604
 605struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id);
 606
 607/*
 608 * Get a cgroup whose id is greater than or equal to id under tree of root.
 609 * Returning a cgroup_subsys_state or NULL.
 610 */
 611struct cgroup_subsys_state *css_get_next(struct cgroup_subsys *ss, int id,
 612                struct cgroup_subsys_state *root, int *foundid);
 613
 614/* Returns true if root is ancestor of cg */
 615bool css_is_ancestor(struct cgroup_subsys_state *cg,
 616                     const struct cgroup_subsys_state *root);
 617
 618/* Get id and depth of css */
 619unsigned short css_id(struct cgroup_subsys_state *css);
 620unsigned short css_depth(struct cgroup_subsys_state *css);
 621struct cgroup_subsys_state *cgroup_css_from_dir(struct file *f, int id);
 622
 623#else /* !CONFIG_CGROUPS */
 624
 625static inline int cgroup_init_early(void) { return 0; }
 626static inline int cgroup_init(void) { return 0; }
 627static inline void cgroup_fork(struct task_struct *p) {}
 628static inline void cgroup_fork_callbacks(struct task_struct *p) {}
 629static inline void cgroup_post_fork(struct task_struct *p) {}
 630static inline void cgroup_exit(struct task_struct *p, int callbacks) {}
 631
 632static inline void cgroup_lock(void) {}
 633static inline void cgroup_unlock(void) {}
 634static inline int cgroupstats_build(struct cgroupstats *stats,
 635                                        struct dentry *dentry)
 636{
 637        return -EINVAL;
 638}
 639
 640/* No cgroups - nothing to do */
 641static inline int cgroup_attach_task_all(struct task_struct *from,
 642                                         struct task_struct *t)
 643{
 644        return 0;
 645}
 646
 647#endif /* !CONFIG_CGROUPS */
 648
 649#endif /* _LINUX_CGROUP_H */
 650
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