include/sys/kmem.h

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://github.com/behlendorf/spl/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23 \*****************************************************************************/
  24
  25 #ifndef _SPL_KMEM_H
  26 #define _SPL_KMEM_H
  27
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/mm_compat.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/rwsem.h>
  34 #include <linux/hash.h>
  35 #include <linux/ctype.h>
  36 #include <asm/atomic.h>
  37 #include <sys/types.h>
  38 #include <sys/vmsystm.h>
  39 #include <sys/kstat.h>
  40
  41 /*
  42  * Memory allocation interfaces
  43  */
  44 #define KM_SLEEP        GFP_KERNEL      /* Can sleep, never fails */
  45 #define KM_NOSLEEP      GFP_ATOMIC      /* Can not sleep, may fail */
  46 #define KM_PUSHPAGE     (GFP_NOIO | __GFP_HIGH) /* Use reserved memory */
  47 #define KM_NODEBUG      __GFP_NOWARN    /* Suppress warnings */
  48 #define KM_FLAGS        __GFP_BITS_MASK
  49 #define KM_VMFLAGS      GFP_LEVEL_MASK
  50
  51 /*
  52  * Used internally, the kernel does not need to support this flag
  53  */
  54 #ifndef __GFP_ZERO
  55 # define __GFP_ZERO                     0x8000
  56 #endif
  57
  58 /*
  59  * __GFP_NOFAIL looks like it will be removed from the kernel perhaps as
  60  * early as 2.6.32.  To avoid this issue when it occurs in upstream kernels
  61  * we retry the allocation here as long as it is not __GFP_WAIT (GFP_ATOMIC).
  62  * I would prefer the caller handle the failure case cleanly but we are
  63  * trying to emulate Solaris and those are not the Solaris semantics.
  64  */
  65 static inline void *
  66 kmalloc_nofail(size_t size, gfp_t flags)
  67 {
  68         void *ptr;
  69
  70         do {
  71                 ptr = kmalloc(size, flags);
  72         } while (ptr == NULL && (flags & __GFP_WAIT));
  73
  74         return ptr;
  75 }
  76
  77 static inline void *
  78 kzalloc_nofail(size_t size, gfp_t flags)
  79 {
  80         void *ptr;
  81
  82         do {
  83                 ptr = kzalloc(size, flags);
  84         } while (ptr == NULL && (flags & __GFP_WAIT));
  85
  86         return ptr;
  87 }
  88
  89 static inline void *
  90 kmalloc_node_nofail(size_t size, gfp_t flags, int node)
  91 {
  92 #ifdef HAVE_KMALLOC_NODE
  93         void *ptr;
  94
  95         do {
  96                 ptr = kmalloc_node(size, flags, node);
  97         } while (ptr == NULL && (flags & __GFP_WAIT));
  98
  99         return ptr;
 100 #else
 101         return kmalloc_nofail(size, flags);
 102 #endif /* HAVE_KMALLOC_NODE */
 103 }
 104
 105 static inline void *
 106 vmalloc_nofail(size_t size, gfp_t flags)
 107 {
 108         void *ptr;
 109
 110         /*
 111          * Retry failed __vmalloc() allocations once every second.  The
 112          * rational for the delay is that the likely failure modes are:
 113          *
 114          * 1) The system has completely exhausted memory, in which case
 115          *    delaying 1 second for the memory reclaim to run is reasonable
 116          *    to avoid thrashing the system.
 117          * 2) The system has memory but has exhausted the small virtual
 118          *    address space available on 32-bit systems.  Retrying the
 119          *    allocation immediately will only result in spinning on the
 120          *    virtual address space lock.  It is better delay a second and
 121          *    hope that another process will free some of the address space.
 122          *    But the bottom line is there is not much we can actually do
 123          *    since we can never safely return a failure and honor the
 124          *    Solaris semantics.
 125          */
 126         while (1) {
 127                 ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
 128                 if (unlikely((ptr == NULL) && (flags & __GFP_WAIT))) {
 129                         set_current_state(TASK_INTERRUPTIBLE);
 130                         schedule_timeout(HZ);
 131                 } else {
 132                         break;
 133                 }
 134         }
 135
 136         return ptr;
 137 }
 138
 139 static inline void *
 140 vzalloc_nofail(size_t size, gfp_t flags)
 141 {
 142         void *ptr;
 143
 144         ptr = vmalloc_nofail(size, flags);
 145         if (ptr)
 146                 memset(ptr, 0, (size));
 147
 148         return ptr;
 149 }
 150
 151 #ifdef DEBUG_KMEM
 152
 153 /*
 154  * Memory accounting functions to be used only when DEBUG_KMEM is set.
 155  */
 156 # ifdef HAVE_ATOMIC64_T
 157
 158 # define kmem_alloc_used_add(size)      atomic64_add(size, &kmem_alloc_used)
 159 # define kmem_alloc_used_sub(size)      atomic64_sub(size, &kmem_alloc_used)
 160 # define kmem_alloc_used_read()         atomic64_read(&kmem_alloc_used)
 161 # define kmem_alloc_used_set(size)      atomic64_set(&kmem_alloc_used, size)
 162 # define vmem_alloc_used_add(size)      atomic64_add(size, &vmem_alloc_used)
 163 # define vmem_alloc_used_sub(size)      atomic64_sub(size, &vmem_alloc_used)
 164 # define vmem_alloc_used_read()         atomic64_read(&vmem_alloc_used)
 165 # define vmem_alloc_used_set(size)      atomic64_set(&vmem_alloc_used, size)
 166
 167 extern atomic64_t kmem_alloc_used;
 168 extern unsigned long long kmem_alloc_max;
 169 extern atomic64_t vmem_alloc_used;
 170 extern unsigned long long vmem_alloc_max;
 171
 172 # else  /* HAVE_ATOMIC64_T */
 173
 174 # define kmem_alloc_used_add(size)      atomic_add(size, &kmem_alloc_used)
 175 # define kmem_alloc_used_sub(size)      atomic_sub(size, &kmem_alloc_used)
 176 # define kmem_alloc_used_read()         atomic_read(&kmem_alloc_used)
 177 # define kmem_alloc_used_set(size)      atomic_set(&kmem_alloc_used, size)
 178 # define vmem_alloc_used_add(size)      atomic_add(size, &vmem_alloc_used)
 179 # define vmem_alloc_used_sub(size)      atomic_sub(size, &vmem_alloc_used)
 180 # define vmem_alloc_used_read()         atomic_read(&vmem_alloc_used)
 181 # define vmem_alloc_used_set(size)      atomic_set(&vmem_alloc_used, size)
 182
 183 extern atomic_t kmem_alloc_used;
 184 extern unsigned long long kmem_alloc_max;
 185 extern atomic_t vmem_alloc_used;
 186 extern unsigned long long vmem_alloc_max;
 187
 188 # endif /* HAVE_ATOMIC64_T */
 189
 190 # ifdef DEBUG_KMEM_TRACKING
 191 /*
 192  * DEBUG_KMEM && DEBUG_KMEM_TRACKING
 193  *
 194  * The maximum level of memory debugging.  All memory will be accounted
 195  * for and each allocation will be explicitly tracked.  Any allocation
 196  * which is leaked will be reported on module unload and the exact location
 197  * where that memory was allocation will be reported.  This level of memory
 198  * tracking will have a significant impact on performance and should only
 199  * be enabled for debugging.  This feature may be enabled by passing
 200  * --enable-debug-kmem-tracking to configure.
 201  */
 202 #  define kmem_alloc(sz, fl)            kmem_alloc_track((sz), (fl),           \
 203                                              __FUNCTION__, __LINE__, 0, 0)
 204 #  define kmem_zalloc(sz, fl)           kmem_alloc_track((sz), (fl)|__GFP_ZERO,\
 205                                              __FUNCTION__, __LINE__, 0, 0)
 206 #  define kmem_alloc_node(sz, fl, nd)   kmem_alloc_track((sz), (fl),           \
 207                                              __FUNCTION__, __LINE__, 1, nd)
 208 #  define kmem_free(ptr, sz)            kmem_free_track((ptr), (sz))
 209
 210 #  define vmem_alloc(sz, fl)            vmem_alloc_track((sz), (fl),           \
 211                                              __FUNCTION__, __LINE__)
 212 #  define vmem_zalloc(sz, fl)           vmem_alloc_track((sz), (fl)|__GFP_ZERO,\
 213                                              __FUNCTION__, __LINE__)
 214 #  define vmem_free(ptr, sz)            vmem_free_track((ptr), (sz))
 215
 216 extern void *kmem_alloc_track(size_t, int, const char *, int, int, int);
 217 extern void kmem_free_track(const void *, size_t);
 218 extern void *vmem_alloc_track(size_t, int, const char *, int);
 219 extern void vmem_free_track(const void *, size_t);
 220
 221 # else /* DEBUG_KMEM_TRACKING */
 222 /*
 223  * DEBUG_KMEM && !DEBUG_KMEM_TRACKING
 224  *
 225  * The default build will set DEBUG_KEM.  This provides basic memory
 226  * accounting with little to no impact on performance.  When the module
 227  * is unloaded in any memory was leaked the total number of leaked bytes
 228  * will be reported on the console.  To disable this basic accounting
 229  * pass the --disable-debug-kmem option to configure.
 230  */
 231 #  define kmem_alloc(sz, fl)            kmem_alloc_debug((sz), (fl),           \
 232                                              __FUNCTION__, __LINE__, 0, 0)
 233 #  define kmem_zalloc(sz, fl)           kmem_alloc_debug((sz), (fl)|__GFP_ZERO,\
 234                                              __FUNCTION__, __LINE__, 0, 0)
 235 #  define kmem_alloc_node(sz, fl, nd)   kmem_alloc_debug((sz), (fl),           \
 236                                              __FUNCTION__, __LINE__, 1, nd)
 237 #  define kmem_free(ptr, sz)            kmem_free_debug((ptr), (sz))
 238
 239 #  define vmem_alloc(sz, fl)            vmem_alloc_debug((sz), (fl),           \
 240                                              __FUNCTION__, __LINE__)
 241 #  define vmem_zalloc(sz, fl)           vmem_alloc_debug((sz), (fl)|__GFP_ZERO,\
 242                                              __FUNCTION__, __LINE__)
 243 #  define vmem_free(ptr, sz)            vmem_free_debug((ptr), (sz))
 244
 245 extern void *kmem_alloc_debug(size_t, int, const char *, int, int, int);
 246 extern void kmem_free_debug(const void *, size_t);
 247 extern void *vmem_alloc_debug(size_t, int, const char *, int);
 248 extern void vmem_free_debug(const void *, size_t);
 249
 250 # endif /* DEBUG_KMEM_TRACKING */
 251 #else /* DEBUG_KMEM */
 252 /*
 253  * !DEBUG_KMEM && !DEBUG_KMEM_TRACKING
 254  *
 255  * All debugging is disabled.  There will be no overhead even for
 256  * minimal memory accounting.  To enable basic accounting pass the
 257  * --enable-debug-kmem option to configure.
 258  */
 259 # define kmem_alloc(sz, fl)             kmalloc_nofail((sz), (fl))
 260 # define kmem_zalloc(sz, fl)            kzalloc_nofail((sz), (fl))
 261 # define kmem_alloc_node(sz, fl, nd)    kmalloc_node_nofail((sz), (fl), (nd))
 262 # define kmem_free(ptr, sz)             ((void)(sz), kfree(ptr))
 263
 264 # define vmem_alloc(sz, fl)             vmalloc_nofail((sz), (fl))
 265 # define vmem_zalloc(sz, fl)            vzalloc_nofail((sz), (fl))
 266 # define vmem_free(ptr, sz)             ((void)(sz), vfree(ptr))
 267
 268 #endif /* DEBUG_KMEM */
 269
 270 extern int kmem_debugging(void);
 271 extern char *kmem_vasprintf(const char *fmt, va_list ap);
 272 extern char *kmem_asprintf(const char *fmt, ...);
 273 extern char *strdup(const char *str);
 274 extern void strfree(char *str);
 275
 276
 277 /*
 278  * Slab allocation interfaces.  The SPL slab differs from the standard
 279  * Linux SLAB or SLUB primarily in that each cache may be backed by slabs
 280  * allocated from the physical or virtal memory address space.  The virtual
 281  * slabs allow for good behavior when allocation large objects of identical
 282  * size.  This slab implementation also supports both constructors and
 283  * destructions which the Linux slab does not.
 284  */
 285 enum {
 286         KMC_BIT_NOTOUCH         = 0,    /* Don't update ages */
 287         KMC_BIT_NODEBUG         = 1,    /* Default behavior */
 288         KMC_BIT_NOMAGAZINE      = 2,    /* XXX: Unsupported */
 289         KMC_BIT_NOHASH          = 3,    /* XXX: Unsupported */
 290         KMC_BIT_QCACHE          = 4,    /* XXX: Unsupported */
 291         KMC_BIT_KMEM            = 5,    /* Use kmem cache */
 292         KMC_BIT_VMEM            = 6,    /* Use vmem cache */
 293         KMC_BIT_OFFSLAB         = 7,    /* Objects not on slab */
 294         KMC_BIT_GROWING         = 15,   /* Growing in progress */
 295         KMC_BIT_REAPING         = 16,   /* Reaping in progress */
 296         KMC_BIT_DESTROY         = 17,   /* Destroy in progress */
 297         KMC_BIT_TOTAL           = 18,   /* Proc handler helper bit */
 298         KMC_BIT_ALLOC           = 19,   /* Proc handler helper bit */
 299         KMC_BIT_MAX             = 20,   /* Proc handler helper bit */
 300 };
 301
 302 /* kmem move callback return values */
 303 typedef enum kmem_cbrc {
 304         KMEM_CBRC_YES           = 0,    /* Object moved */
 305         KMEM_CBRC_NO            = 1,    /* Object not moved */
 306         KMEM_CBRC_LATER         = 2,    /* Object not moved, try again later */
 307         KMEM_CBRC_DONT_NEED     = 3,    /* Neither object is needed */
 308         KMEM_CBRC_DONT_KNOW     = 4,    /* Object unknown */
 309 } kmem_cbrc_t;
 310
 311 #define KMC_NOTOUCH             (1 << KMC_BIT_NOTOUCH)
 312 #define KMC_NODEBUG             (1 << KMC_BIT_NODEBUG)
 313 #define KMC_NOMAGAZINE          (1 << KMC_BIT_NOMAGAZINE)
 314 #define KMC_NOHASH              (1 << KMC_BIT_NOHASH)
 315 #define KMC_QCACHE              (1 << KMC_BIT_QCACHE)
 316 #define KMC_KMEM                (1 << KMC_BIT_KMEM)
 317 #define KMC_VMEM                (1 << KMC_BIT_VMEM)
 318 #define KMC_OFFSLAB             (1 << KMC_BIT_OFFSLAB)
 319 #define KMC_GROWING             (1 << KMC_BIT_GROWING)
 320 #define KMC_REAPING             (1 << KMC_BIT_REAPING)
 321 #define KMC_DESTROY             (1 << KMC_BIT_DESTROY)
 322 #define KMC_TOTAL               (1 << KMC_BIT_TOTAL)
 323 #define KMC_ALLOC               (1 << KMC_BIT_ALLOC)
 324 #define KMC_MAX                 (1 << KMC_BIT_MAX)
 325
 326 #define KMC_REAP_CHUNK                  INT_MAX
 327 #define KMC_DEFAULT_SEEKS               1
 328
 329 extern struct list_head spl_kmem_cache_list;
 330 extern struct rw_semaphore spl_kmem_cache_sem;
 331
 332 #define SKM_MAGIC                       0x2e2e2e2e
 333 #define SKO_MAGIC                       0x20202020
 334 #define SKS_MAGIC                       0x22222222
 335 #define SKC_MAGIC                       0x2c2c2c2c
 336
 337 #define SPL_KMEM_CACHE_DELAY            15      /* Minimum slab release age */
 338 #define SPL_KMEM_CACHE_REAP             0       /* Default reap everything */
 339 #define SPL_KMEM_CACHE_OBJ_PER_SLAB     16      /* Target objects per slab */
 340 #define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN 8       /* Minimum objects per slab */
 341 #define SPL_KMEM_CACHE_ALIGN            8       /* Default object alignment */
 342
 343 #define POINTER_IS_VALID(p)             0       /* Unimplemented */
 344 #define POINTER_INVALIDATE(pp)                  /* Unimplemented */
 345
 346 typedef int (*spl_kmem_ctor_t)(void *, void *, int);
 347 typedef void (*spl_kmem_dtor_t)(void *, void *);
 348 typedef void (*spl_kmem_reclaim_t)(void *);
 349
 350 typedef struct spl_kmem_magazine {
 351         uint32_t                skm_magic;      /* Sanity magic */
 352         uint32_t                skm_avail;      /* Available objects */
 353         uint32_t                skm_size;       /* Magazine size */
 354         uint32_t                skm_refill;     /* Batch refill size */
 355         struct spl_kmem_cache   *skm_cache;     /* Owned by cache */
 356         struct delayed_work     skm_work;       /* Magazine reclaim work */
 357         unsigned long           skm_age;        /* Last cache access */
 358         unsigned int            skm_cpu;        /* Owned by cpu */
 359         void                    *skm_objs[0];   /* Object pointers */
 360 } spl_kmem_magazine_t;
 361
 362 typedef struct spl_kmem_obj {
 363         uint32_t                sko_magic;      /* Sanity magic */
 364         void                    *sko_addr;      /* Buffer address */
 365         struct spl_kmem_slab    *sko_slab;      /* Owned by slab */
 366         struct list_head        sko_list;       /* Free object list linkage */
 367 } spl_kmem_obj_t;
 368
 369 typedef struct spl_kmem_slab {
 370         uint32_t                sks_magic;      /* Sanity magic */
 371         uint32_t                sks_objs;       /* Objects per slab */
 372         struct spl_kmem_cache   *sks_cache;     /* Owned by cache */
 373         struct list_head        sks_list;       /* Slab list linkage */
 374         struct list_head        sks_free_list;  /* Free object list */
 375         unsigned long           sks_age;        /* Last modify jiffie */
 376         uint32_t                sks_ref;        /* Ref count used objects */
 377 } spl_kmem_slab_t;
 378
 379 typedef struct spl_kmem_alloc {
 380         struct spl_kmem_cache   *ska_cache;     /* Owned by cache */
 381         int                     ska_flags;      /* Allocation flags */
 382         struct delayed_work     ska_work;       /* Allocation work */
 383 } spl_kmem_alloc_t;
 384
 385 typedef struct spl_kmem_emergency {
 386         void                    *ske_obj;       /* Buffer address */
 387         struct list_head        ske_list;       /* Emergency list linkage */
 388 } spl_kmem_emergency_t;
 389
 390 typedef struct spl_kmem_cache {
 391         uint32_t                skc_magic;      /* Sanity magic */
 392         uint32_t                skc_name_size;  /* Name length */
 393         char                    *skc_name;      /* Name string */
 394         spl_kmem_magazine_t     *skc_mag[NR_CPUS]; /* Per-CPU warm cache */
 395         uint32_t                skc_mag_size;   /* Magazine size */
 396         uint32_t                skc_mag_refill; /* Magazine refill count */
 397         spl_kmem_ctor_t         skc_ctor;       /* Constructor */
 398         spl_kmem_dtor_t         skc_dtor;       /* Destructor */
 399         spl_kmem_reclaim_t      skc_reclaim;    /* Reclaimator */
 400         void                    *skc_private;   /* Private data */
 401         void                    *skc_vmp;       /* Unused */
 402         unsigned long           skc_flags;      /* Flags */
 403         uint32_t                skc_obj_size;   /* Object size */
 404         uint32_t                skc_obj_align;  /* Object alignment */
 405         uint32_t                skc_slab_objs;  /* Objects per slab */
 406         uint32_t                skc_slab_size;  /* Slab size */
 407         uint32_t                skc_delay;      /* Slab reclaim interval */
 408         uint32_t                skc_reap;       /* Slab reclaim count */
 409         atomic_t                skc_ref;        /* Ref count callers */
 410         struct delayed_work     skc_work;       /* Slab reclaim work */
 411         struct list_head        skc_list;       /* List of caches linkage */
 412         struct list_head        skc_complete_list;/* Completely alloc'ed */
 413         struct list_head        skc_partial_list; /* Partially alloc'ed */
 414         struct list_head        skc_emergency_list; /* Min sized objects */
 415         spinlock_t              skc_lock;       /* Cache lock */
 416         wait_queue_head_t       skc_waitq;      /* Allocation waiters */
 417         uint64_t                skc_slab_fail;  /* Slab alloc failures */
 418         uint64_t                skc_slab_create;/* Slab creates */
 419         uint64_t                skc_slab_destroy;/* Slab destroys */
 420         uint64_t                skc_slab_total; /* Slab total current */
 421         uint64_t                skc_slab_alloc; /* Slab alloc current */
 422         uint64_t                skc_slab_max;   /* Slab max historic  */
 423         uint64_t                skc_obj_total;  /* Obj total current */
 424         uint64_t                skc_obj_alloc;  /* Obj alloc current */
 425         uint64_t                skc_obj_max;    /* Obj max historic */
 426         uint64_t                skc_obj_emergency; /* Obj emergency current */
 427         uint64_t                skc_obj_emergency_max; /* Obj emergency max */
 428 } spl_kmem_cache_t;
 429 #define kmem_cache_t            spl_kmem_cache_t
 430
 431 extern spl_kmem_cache_t *spl_kmem_cache_create(char *name, size_t size,
 432         size_t align, spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor,
 433         spl_kmem_reclaim_t reclaim, void *priv, void *vmp, int flags);
 434 extern void spl_kmem_cache_set_move(spl_kmem_cache_t *,
 435         kmem_cbrc_t (*)(void *, void *, size_t, void *));
 436 extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
 437 extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
 438 extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
 439 extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count);
 440 extern void spl_kmem_reap(void);
 441
 442 int spl_kmem_init_kallsyms_lookup(void);
 443 int spl_kmem_init(void);
 444 void spl_kmem_fini(void);
 445
 446 #define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
 447         spl_kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
 448 #define kmem_cache_set_move(skc, move)  spl_kmem_cache_set_move(skc, move)
 449 #define kmem_cache_destroy(skc)         spl_kmem_cache_destroy(skc)
 450 #define kmem_cache_alloc(skc, flags)    spl_kmem_cache_alloc(skc, flags)
 451 #define kmem_cache_free(skc, obj)       spl_kmem_cache_free(skc, obj)
 452 #define kmem_cache_reap_now(skc)        \
 453         spl_kmem_cache_reap_now(skc, skc->skc_reap)
 454 #define kmem_reap()                     spl_kmem_reap()
 455 #define kmem_virt(ptr)                  (((ptr) >= (void *)VMALLOC_START) && \
 456                                          ((ptr) <  (void *)VMALLOC_END))
 457
 458 #endif  /* _SPL_KMEM_H */