LCOV - code coverage report
Current view: top level - include/linux - nodemask.h (source / functions) Hit Total Coverage
Test: fstests of 6.5.0-rc4-xfsa @ Mon Jul 31 20:08:27 PDT 2023 Lines: 2 4 50.0 %
Date: 2023-07-31 20:08:27 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef __LINUX_NODEMASK_H
       3             : #define __LINUX_NODEMASK_H
       4             : 
       5             : /*
       6             :  * Nodemasks provide a bitmap suitable for representing the
       7             :  * set of Node's in a system, one bit position per Node number.
       8             :  *
       9             :  * See detailed comments in the file linux/bitmap.h describing the
      10             :  * data type on which these nodemasks are based.
      11             :  *
      12             :  * For details of nodemask_parse_user(), see bitmap_parse_user() in
      13             :  * lib/bitmap.c.  For details of nodelist_parse(), see bitmap_parselist(),
      14             :  * also in bitmap.c.  For details of node_remap(), see bitmap_bitremap in
      15             :  * lib/bitmap.c.  For details of nodes_remap(), see bitmap_remap in
      16             :  * lib/bitmap.c.  For details of nodes_onto(), see bitmap_onto in
      17             :  * lib/bitmap.c.  For details of nodes_fold(), see bitmap_fold in
      18             :  * lib/bitmap.c.
      19             :  *
      20             :  * The available nodemask operations are:
      21             :  *
      22             :  * void node_set(node, mask)            turn on bit 'node' in mask
      23             :  * void node_clear(node, mask)          turn off bit 'node' in mask
      24             :  * void nodes_setall(mask)              set all bits
      25             :  * void nodes_clear(mask)               clear all bits
      26             :  * int node_isset(node, mask)           true iff bit 'node' set in mask
      27             :  * int node_test_and_set(node, mask)    test and set bit 'node' in mask
      28             :  *
      29             :  * void nodes_and(dst, src1, src2)      dst = src1 & src2  [intersection]
      30             :  * void nodes_or(dst, src1, src2)       dst = src1 | src2  [union]
      31             :  * void nodes_xor(dst, src1, src2)      dst = src1 ^ src2
      32             :  * void nodes_andnot(dst, src1, src2)   dst = src1 & ~src2
      33             :  * void nodes_complement(dst, src)      dst = ~src
      34             :  *
      35             :  * int nodes_equal(mask1, mask2)        Does mask1 == mask2?
      36             :  * int nodes_intersects(mask1, mask2)   Do mask1 and mask2 intersect?
      37             :  * int nodes_subset(mask1, mask2)       Is mask1 a subset of mask2?
      38             :  * int nodes_empty(mask)                Is mask empty (no bits sets)?
      39             :  * int nodes_full(mask)                 Is mask full (all bits sets)?
      40             :  * int nodes_weight(mask)               Hamming weight - number of set bits
      41             :  *
      42             :  * void nodes_shift_right(dst, src, n)  Shift right
      43             :  * void nodes_shift_left(dst, src, n)   Shift left
      44             :  *
      45             :  * unsigned int first_node(mask)        Number lowest set bit, or MAX_NUMNODES
      46             :  * unsigend int next_node(node, mask)   Next node past 'node', or MAX_NUMNODES
      47             :  * unsigned int next_node_in(node, mask) Next node past 'node', or wrap to first,
      48             :  *                                      or MAX_NUMNODES
      49             :  * unsigned int first_unset_node(mask)  First node not set in mask, or
      50             :  *                                      MAX_NUMNODES
      51             :  *
      52             :  * nodemask_t nodemask_of_node(node)    Return nodemask with bit 'node' set
      53             :  * NODE_MASK_ALL                        Initializer - all bits set
      54             :  * NODE_MASK_NONE                       Initializer - no bits set
      55             :  * unsigned long *nodes_addr(mask)      Array of unsigned long's in mask
      56             :  *
      57             :  * int nodemask_parse_user(ubuf, ulen, mask)    Parse ascii string as nodemask
      58             :  * int nodelist_parse(buf, map)         Parse ascii string as nodelist
      59             :  * int node_remap(oldbit, old, new)     newbit = map(old, new)(oldbit)
      60             :  * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src)
      61             :  * void nodes_onto(dst, orig, relmap)   *dst = orig relative to relmap
      62             :  * void nodes_fold(dst, orig, sz)       dst bits = orig bits mod sz
      63             :  *
      64             :  * for_each_node_mask(node, mask)       for-loop node over mask
      65             :  *
      66             :  * int num_online_nodes()               Number of online Nodes
      67             :  * int num_possible_nodes()             Number of all possible Nodes
      68             :  *
      69             :  * int node_random(mask)                Random node with set bit in mask
      70             :  *
      71             :  * int node_online(node)                Is some node online?
      72             :  * int node_possible(node)              Is some node possible?
      73             :  *
      74             :  * node_set_online(node)                set bit 'node' in node_online_map
      75             :  * node_set_offline(node)               clear bit 'node' in node_online_map
      76             :  *
      77             :  * for_each_node(node)                  for-loop node over node_possible_map
      78             :  * for_each_online_node(node)           for-loop node over node_online_map
      79             :  *
      80             :  * Subtlety:
      81             :  * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
      82             :  *    to generate slightly worse code.  So use a simple one-line #define
      83             :  *    for node_isset(), instead of wrapping an inline inside a macro, the
      84             :  *    way we do the other calls.
      85             :  *
      86             :  * NODEMASK_SCRATCH
      87             :  * When doing above logical AND, OR, XOR, Remap operations the callers tend to
      88             :  * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large,
      89             :  * nodemask_t's consume too much stack space.  NODEMASK_SCRATCH is a helper
      90             :  * for such situations. See below and CPUMASK_ALLOC also.
      91             :  */
      92             : 
      93             : #include <linux/threads.h>
      94             : #include <linux/bitmap.h>
      95             : #include <linux/minmax.h>
      96             : #include <linux/numa.h>
      97             : #include <linux/random.h>
      98             : 
      99             : typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
     100             : extern nodemask_t _unused_nodemask_arg_;
     101             : 
     102             : /**
     103             :  * nodemask_pr_args - printf args to output a nodemask
     104             :  * @maskp: nodemask to be printed
     105             :  *
     106             :  * Can be used to provide arguments for '%*pb[l]' when printing a nodemask.
     107             :  */
     108             : #define nodemask_pr_args(maskp) __nodemask_pr_numnodes(maskp), \
     109             :                                 __nodemask_pr_bits(maskp)
     110             : static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m)
     111             : {
     112             :         return m ? MAX_NUMNODES : 0;
     113             : }
     114             : static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m)
     115             : {
     116             :         return m ? m->bits : NULL;
     117             : }
     118             : 
     119             : /*
     120             :  * The inline keyword gives the compiler room to decide to inline, or
     121             :  * not inline a function as it sees best.  However, as these functions
     122             :  * are called in both __init and non-__init functions, if they are not
     123             :  * inlined we will end up with a section mismatch error (of the type of
     124             :  * freeable items not being freed).  So we must use __always_inline here
     125             :  * to fix the problem.  If other functions in the future also end up in
     126             :  * this situation they will also need to be annotated as __always_inline
     127             :  */
     128             : #define node_set(node, dst) __node_set((node), &(dst))
     129             : static __always_inline void __node_set(int node, volatile nodemask_t *dstp)
     130             : {
     131             :         set_bit(node, dstp->bits);
     132             : }
     133             : 
     134             : #define node_clear(node, dst) __node_clear((node), &(dst))
     135             : static inline void __node_clear(int node, volatile nodemask_t *dstp)
     136             : {
     137             :         clear_bit(node, dstp->bits);
     138             : }
     139             : 
     140             : #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
     141             : static inline void __nodes_setall(nodemask_t *dstp, unsigned int nbits)
     142             : {
     143             :         bitmap_fill(dstp->bits, nbits);
     144             : }
     145             : 
     146             : #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
     147             : static inline void __nodes_clear(nodemask_t *dstp, unsigned int nbits)
     148             : {
     149             :         bitmap_zero(dstp->bits, nbits);
     150             : }
     151             : 
     152             : /* No static inline type checking - see Subtlety (1) above. */
     153             : #define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
     154             : 
     155             : #define node_test_and_set(node, nodemask) \
     156             :                         __node_test_and_set((node), &(nodemask))
     157             : static inline bool __node_test_and_set(int node, nodemask_t *addr)
     158             : {
     159             :         return test_and_set_bit(node, addr->bits);
     160             : }
     161             : 
     162             : #define nodes_and(dst, src1, src2) \
     163             :                         __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
     164             : static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
     165             :                                         const nodemask_t *src2p, unsigned int nbits)
     166             : {
     167             :         bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
     168             : }
     169             : 
     170             : #define nodes_or(dst, src1, src2) \
     171             :                         __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
     172             : static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
     173             :                                         const nodemask_t *src2p, unsigned int nbits)
     174             : {
     175             :         bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
     176             : }
     177             : 
     178             : #define nodes_xor(dst, src1, src2) \
     179             :                         __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
     180             : static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
     181             :                                         const nodemask_t *src2p, unsigned int nbits)
     182             : {
     183             :         bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
     184             : }
     185             : 
     186             : #define nodes_andnot(dst, src1, src2) \
     187             :                         __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
     188             : static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
     189             :                                         const nodemask_t *src2p, unsigned int nbits)
     190             : {
     191             :         bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
     192             : }
     193             : 
     194             : #define nodes_complement(dst, src) \
     195             :                         __nodes_complement(&(dst), &(src), MAX_NUMNODES)
     196             : static inline void __nodes_complement(nodemask_t *dstp,
     197             :                                         const nodemask_t *srcp, unsigned int nbits)
     198             : {
     199             :         bitmap_complement(dstp->bits, srcp->bits, nbits);
     200             : }
     201             : 
     202             : #define nodes_equal(src1, src2) \
     203             :                         __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
     204             : static inline bool __nodes_equal(const nodemask_t *src1p,
     205             :                                         const nodemask_t *src2p, unsigned int nbits)
     206             : {
     207             :         return bitmap_equal(src1p->bits, src2p->bits, nbits);
     208             : }
     209             : 
     210             : #define nodes_intersects(src1, src2) \
     211             :                         __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
     212             : static inline bool __nodes_intersects(const nodemask_t *src1p,
     213             :                                         const nodemask_t *src2p, unsigned int nbits)
     214             : {
     215             :         return bitmap_intersects(src1p->bits, src2p->bits, nbits);
     216             : }
     217             : 
     218             : #define nodes_subset(src1, src2) \
     219             :                         __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
     220             : static inline bool __nodes_subset(const nodemask_t *src1p,
     221             :                                         const nodemask_t *src2p, unsigned int nbits)
     222             : {
     223             :         return bitmap_subset(src1p->bits, src2p->bits, nbits);
     224             : }
     225             : 
     226             : #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
     227             : static inline bool __nodes_empty(const nodemask_t *srcp, unsigned int nbits)
     228             : {
     229             :         return bitmap_empty(srcp->bits, nbits);
     230             : }
     231             : 
     232             : #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
     233             : static inline bool __nodes_full(const nodemask_t *srcp, unsigned int nbits)
     234             : {
     235             :         return bitmap_full(srcp->bits, nbits);
     236             : }
     237             : 
     238             : #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
     239             : static inline int __nodes_weight(const nodemask_t *srcp, unsigned int nbits)
     240             : {
     241             :         return bitmap_weight(srcp->bits, nbits);
     242             : }
     243             : 
     244             : #define nodes_shift_right(dst, src, n) \
     245             :                         __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
     246             : static inline void __nodes_shift_right(nodemask_t *dstp,
     247             :                                         const nodemask_t *srcp, int n, int nbits)
     248             : {
     249             :         bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
     250             : }
     251             : 
     252             : #define nodes_shift_left(dst, src, n) \
     253             :                         __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
     254             : static inline void __nodes_shift_left(nodemask_t *dstp,
     255             :                                         const nodemask_t *srcp, int n, int nbits)
     256             : {
     257             :         bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
     258             : }
     259             : 
     260             : /* FIXME: better would be to fix all architectures to never return
     261             :           > MAX_NUMNODES, then the silly min_ts could be dropped. */
     262             : 
     263             : #define first_node(src) __first_node(&(src))
     264             : static inline unsigned int __first_node(const nodemask_t *srcp)
     265             : {
     266      802464 :         return min_t(unsigned int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
     267             : }
     268             : 
     269             : #define next_node(n, src) __next_node((n), &(src))
     270             : static inline unsigned int __next_node(int n, const nodemask_t *srcp)
     271             : {
     272      400685 :         return min_t(unsigned int, MAX_NUMNODES, find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
     273             : }
     274             : 
     275             : /*
     276             :  * Find the next present node in src, starting after node n, wrapping around to
     277             :  * the first node in src if needed.  Returns MAX_NUMNODES if src is empty.
     278             :  */
     279             : #define next_node_in(n, src) __next_node_in((n), &(src))
     280             : static inline unsigned int __next_node_in(int node, const nodemask_t *srcp)
     281             : {
     282             :         unsigned int ret = __next_node(node, srcp);
     283             : 
     284             :         if (ret == MAX_NUMNODES)
     285             :                 ret = __first_node(srcp);
     286             :         return ret;
     287             : }
     288             : 
     289             : static inline void init_nodemask_of_node(nodemask_t *mask, int node)
     290             : {
     291             :         nodes_clear(*mask);
     292             :         node_set(node, *mask);
     293             : }
     294             : 
     295             : #define nodemask_of_node(node)                                          \
     296             : ({                                                                      \
     297             :         typeof(_unused_nodemask_arg_) m;                                \
     298             :         if (sizeof(m) == sizeof(unsigned long)) {                       \
     299             :                 m.bits[0] = 1UL << (node);                                \
     300             :         } else {                                                        \
     301             :                 init_nodemask_of_node(&m, (node));                  \
     302             :         }                                                               \
     303             :         m;                                                              \
     304             : })
     305             : 
     306             : #define first_unset_node(mask) __first_unset_node(&(mask))
     307             : static inline unsigned int __first_unset_node(const nodemask_t *maskp)
     308             : {
     309             :         return min_t(unsigned int, MAX_NUMNODES,
     310             :                         find_first_zero_bit(maskp->bits, MAX_NUMNODES));
     311             : }
     312             : 
     313             : #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
     314             : 
     315             : #if MAX_NUMNODES <= BITS_PER_LONG
     316             : 
     317             : #define NODE_MASK_ALL                                                   \
     318             : ((nodemask_t) { {                                                       \
     319             :         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
     320             : } })
     321             : 
     322             : #else
     323             : 
     324             : #define NODE_MASK_ALL                                                   \
     325             : ((nodemask_t) { {                                                       \
     326             :         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL,                   \
     327             :         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
     328             : } })
     329             : 
     330             : #endif
     331             : 
     332             : #define NODE_MASK_NONE                                                  \
     333             : ((nodemask_t) { {                                                       \
     334             :         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] =  0UL                    \
     335             : } })
     336             : 
     337             : #define nodes_addr(src) ((src).bits)
     338             : 
     339             : #define nodemask_parse_user(ubuf, ulen, dst) \
     340             :                 __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
     341             : static inline int __nodemask_parse_user(const char __user *buf, int len,
     342             :                                         nodemask_t *dstp, int nbits)
     343             : {
     344             :         return bitmap_parse_user(buf, len, dstp->bits, nbits);
     345             : }
     346             : 
     347             : #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
     348             : static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
     349             : {
     350             :         return bitmap_parselist(buf, dstp->bits, nbits);
     351             : }
     352             : 
     353             : #define node_remap(oldbit, old, new) \
     354             :                 __node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
     355             : static inline int __node_remap(int oldbit,
     356             :                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
     357             : {
     358             :         return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
     359             : }
     360             : 
     361             : #define nodes_remap(dst, src, old, new) \
     362             :                 __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
     363             : static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
     364             :                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
     365             : {
     366             :         bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
     367             : }
     368             : 
     369             : #define nodes_onto(dst, orig, relmap) \
     370             :                 __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
     371             : static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp,
     372             :                 const nodemask_t *relmapp, int nbits)
     373             : {
     374             :         bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
     375             : }
     376             : 
     377             : #define nodes_fold(dst, orig, sz) \
     378             :                 __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
     379             : static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
     380             :                 int sz, int nbits)
     381             : {
     382             :         bitmap_fold(dstp->bits, origp->bits, sz, nbits);
     383             : }
     384             : 
     385             : #if MAX_NUMNODES > 1
     386             : #define for_each_node_mask(node, mask)                              \
     387             :         for ((node) = first_node(mask);                             \
     388             :              (node) < MAX_NUMNODES;                              \
     389             :              (node) = next_node((node), (mask)))
     390             : #else /* MAX_NUMNODES == 1 */
     391             : #define for_each_node_mask(node, mask)                                  \
     392             :         for ((node) = 0; (node) < 1 && !nodes_empty(mask); (node)++)
     393             : #endif /* MAX_NUMNODES */
     394             : 
     395             : /*
     396             :  * Bitmasks that are kept for all the nodes.
     397             :  */
     398             : enum node_states {
     399             :         N_POSSIBLE,             /* The node could become online at some point */
     400             :         N_ONLINE,               /* The node is online */
     401             :         N_NORMAL_MEMORY,        /* The node has regular memory */
     402             : #ifdef CONFIG_HIGHMEM
     403             :         N_HIGH_MEMORY,          /* The node has regular or high memory */
     404             : #else
     405             :         N_HIGH_MEMORY = N_NORMAL_MEMORY,
     406             : #endif
     407             :         N_MEMORY,               /* The node has memory(regular, high, movable) */
     408             :         N_CPU,          /* The node has one or more cpus */
     409             :         N_GENERIC_INITIATOR,    /* The node has one or more Generic Initiators */
     410             :         NR_NODE_STATES
     411             : };
     412             : 
     413             : /*
     414             :  * The following particular system nodemasks and operations
     415             :  * on them manage all possible and online nodes.
     416             :  */
     417             : 
     418             : extern nodemask_t node_states[NR_NODE_STATES];
     419             : 
     420             : #if MAX_NUMNODES > 1
     421           0 : static inline int node_state(int node, enum node_states state)
     422             : {
     423           0 :         return node_isset(node, node_states[state]);
     424             : }
     425             : 
     426             : static inline void node_set_state(int node, enum node_states state)
     427             : {
     428             :         __node_set(node, &node_states[state]);
     429             : }
     430             : 
     431             : static inline void node_clear_state(int node, enum node_states state)
     432             : {
     433             :         __node_clear(node, &node_states[state]);
     434             : }
     435             : 
     436             : static inline int num_node_state(enum node_states state)
     437             : {
     438             :         return nodes_weight(node_states[state]);
     439             : }
     440             : 
     441             : #define for_each_node_state(__node, __state) \
     442             :         for_each_node_mask((__node), node_states[__state])
     443             : 
     444             : #define first_online_node       first_node(node_states[N_ONLINE])
     445             : #define first_memory_node       first_node(node_states[N_MEMORY])
     446             : static inline unsigned int next_online_node(int nid)
     447             : {
     448             :         return next_node(nid, node_states[N_ONLINE]);
     449             : }
     450             : static inline unsigned int next_memory_node(int nid)
     451             : {
     452             :         return next_node(nid, node_states[N_MEMORY]);
     453             : }
     454             : 
     455             : extern unsigned int nr_node_ids;
     456             : extern unsigned int nr_online_nodes;
     457             : 
     458             : static inline void node_set_online(int nid)
     459             : {
     460             :         node_set_state(nid, N_ONLINE);
     461             :         nr_online_nodes = num_node_state(N_ONLINE);
     462             : }
     463             : 
     464             : static inline void node_set_offline(int nid)
     465             : {
     466             :         node_clear_state(nid, N_ONLINE);
     467             :         nr_online_nodes = num_node_state(N_ONLINE);
     468             : }
     469             : 
     470             : #else
     471             : 
     472             : static inline int node_state(int node, enum node_states state)
     473             : {
     474             :         return node == 0;
     475             : }
     476             : 
     477             : static inline void node_set_state(int node, enum node_states state)
     478             : {
     479             : }
     480             : 
     481             : static inline void node_clear_state(int node, enum node_states state)
     482             : {
     483             : }
     484             : 
     485             : static inline int num_node_state(enum node_states state)
     486             : {
     487             :         return 1;
     488             : }
     489             : 
     490             : #define for_each_node_state(node, __state) \
     491             :         for ( (node) = 0; (node) == 0; (node) = 1)
     492             : 
     493             : #define first_online_node       0
     494             : #define first_memory_node       0
     495             : #define next_online_node(nid)   (MAX_NUMNODES)
     496             : #define next_memory_node(nid)   (MAX_NUMNODES)
     497             : #define nr_node_ids             1U
     498             : #define nr_online_nodes         1U
     499             : 
     500             : #define node_set_online(node)      node_set_state((node), N_ONLINE)
     501             : #define node_set_offline(node)     node_clear_state((node), N_ONLINE)
     502             : 
     503             : #endif
     504             : 
     505             : static inline int node_random(const nodemask_t *maskp)
     506             : {
     507             : #if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1)
     508             :         int w, bit;
     509             : 
     510             :         w = nodes_weight(*maskp);
     511             :         switch (w) {
     512             :         case 0:
     513             :                 bit = NUMA_NO_NODE;
     514             :                 break;
     515             :         case 1:
     516             :                 bit = first_node(*maskp);
     517             :                 break;
     518             :         default:
     519             :                 bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_u32_below(w));
     520             :                 break;
     521             :         }
     522             :         return bit;
     523             : #else
     524             :         return 0;
     525             : #endif
     526             : }
     527             : 
     528             : #define node_online_map         node_states[N_ONLINE]
     529             : #define node_possible_map       node_states[N_POSSIBLE]
     530             : 
     531             : #define num_online_nodes()      num_node_state(N_ONLINE)
     532             : #define num_possible_nodes()    num_node_state(N_POSSIBLE)
     533             : #define node_online(node)       node_state((node), N_ONLINE)
     534             : #define node_possible(node)     node_state((node), N_POSSIBLE)
     535             : 
     536             : #define for_each_node(node)        for_each_node_state(node, N_POSSIBLE)
     537             : #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
     538             : 
     539             : /*
     540             :  * For nodemask scratch area.
     541             :  * NODEMASK_ALLOC(type, name) allocates an object with a specified type and
     542             :  * name.
     543             :  */
     544             : #if NODES_SHIFT > 8 /* nodemask_t > 32 bytes */
     545             : #define NODEMASK_ALLOC(type, name, gfp_flags)   \
     546             :                         type *name = kmalloc(sizeof(*name), gfp_flags)
     547             : #define NODEMASK_FREE(m)                        kfree(m)
     548             : #else
     549             : #define NODEMASK_ALLOC(type, name, gfp_flags)   type _##name, *name = &_##name
     550             : #define NODEMASK_FREE(m)                        do {} while (0)
     551             : #endif
     552             : 
     553             : /* Example structure for using NODEMASK_ALLOC, used in mempolicy. */
     554             : struct nodemask_scratch {
     555             :         nodemask_t      mask1;
     556             :         nodemask_t      mask2;
     557             : };
     558             : 
     559             : #define NODEMASK_SCRATCH(x)                                             \
     560             :                         NODEMASK_ALLOC(struct nodemask_scratch, x,      \
     561             :                                         GFP_KERNEL | __GFP_NORETRY)
     562             : #define NODEMASK_SCRATCH_FREE(x)        NODEMASK_FREE(x)
     563             : 
     564             : 
     565             : #endif /* __LINUX_NODEMASK_H */

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