cregit-Linux how code gets into the kernel

Release 4.16 include/linux/nodemask.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_NODEMASK_H

#define __LINUX_NODEMASK_H

/*
 * Nodemasks provide a bitmap suitable for representing the
 * set of Node's in a system, one bit position per Node number.
 *
 * See detailed comments in the file linux/bitmap.h describing the
 * data type on which these nodemasks are based.
 *
 * For details of nodemask_parse_user(), see bitmap_parse_user() in
 * lib/bitmap.c.  For details of nodelist_parse(), see bitmap_parselist(),
 * also in bitmap.c.  For details of node_remap(), see bitmap_bitremap in
 * lib/bitmap.c.  For details of nodes_remap(), see bitmap_remap in
 * lib/bitmap.c.  For details of nodes_onto(), see bitmap_onto in
 * lib/bitmap.c.  For details of nodes_fold(), see bitmap_fold in
 * lib/bitmap.c.
 *
 * The available nodemask operations are:
 *
 * void node_set(node, mask)            turn on bit 'node' in mask
 * void node_clear(node, mask)          turn off bit 'node' in mask
 * void nodes_setall(mask)              set all bits
 * void nodes_clear(mask)               clear all bits
 * int node_isset(node, mask)           true iff bit 'node' set in mask
 * int node_test_and_set(node, mask)    test and set bit 'node' in mask
 *
 * void nodes_and(dst, src1, src2)      dst = src1 & src2  [intersection]
 * void nodes_or(dst, src1, src2)       dst = src1 | src2  [union]
 * void nodes_xor(dst, src1, src2)      dst = src1 ^ src2
 * void nodes_andnot(dst, src1, src2)   dst = src1 & ~src2
 * void nodes_complement(dst, src)      dst = ~src
 *
 * int nodes_equal(mask1, mask2)        Does mask1 == mask2?
 * int nodes_intersects(mask1, mask2)   Do mask1 and mask2 intersect?
 * int nodes_subset(mask1, mask2)       Is mask1 a subset of mask2?
 * int nodes_empty(mask)                Is mask empty (no bits sets)?
 * int nodes_full(mask)                 Is mask full (all bits sets)?
 * int nodes_weight(mask)               Hamming weight - number of set bits
 *
 * void nodes_shift_right(dst, src, n)  Shift right
 * void nodes_shift_left(dst, src, n)   Shift left
 *
 * int first_node(mask)                 Number lowest set bit, or MAX_NUMNODES
 * int next_node(node, mask)            Next node past 'node', or MAX_NUMNODES
 * int next_node_in(node, mask)         Next node past 'node', or wrap to first,
 *                                      or MAX_NUMNODES
 * int first_unset_node(mask)           First node not set in mask, or 
 *                                      MAX_NUMNODES
 *
 * nodemask_t nodemask_of_node(node)    Return nodemask with bit 'node' set
 * NODE_MASK_ALL                        Initializer - all bits set
 * NODE_MASK_NONE                       Initializer - no bits set
 * unsigned long *nodes_addr(mask)      Array of unsigned long's in mask
 *
 * int nodemask_parse_user(ubuf, ulen, mask)    Parse ascii string as nodemask
 * int nodelist_parse(buf, map)         Parse ascii string as nodelist
 * int node_remap(oldbit, old, new)     newbit = map(old, new)(oldbit)
 * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src)
 * void nodes_onto(dst, orig, relmap)   *dst = orig relative to relmap
 * void nodes_fold(dst, orig, sz)       dst bits = orig bits mod sz
 *
 * for_each_node_mask(node, mask)       for-loop node over mask
 *
 * int num_online_nodes()               Number of online Nodes
 * int num_possible_nodes()             Number of all possible Nodes
 *
 * int node_random(mask)                Random node with set bit in mask
 *
 * int node_online(node)                Is some node online?
 * int node_possible(node)              Is some node possible?
 *
 * node_set_online(node)                set bit 'node' in node_online_map
 * node_set_offline(node)               clear bit 'node' in node_online_map
 *
 * for_each_node(node)                  for-loop node over node_possible_map
 * for_each_online_node(node)           for-loop node over node_online_map
 *
 * Subtlety:
 * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
 *    to generate slightly worse code.  So use a simple one-line #define
 *    for node_isset(), instead of wrapping an inline inside a macro, the
 *    way we do the other calls.
 *
 * NODEMASK_SCRATCH
 * When doing above logical AND, OR, XOR, Remap operations the callers tend to
 * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large,
 * nodemask_t's consume too much stack space.  NODEMASK_SCRATCH is a helper
 * for such situations. See below and CPUMASK_ALLOC also.
 */

#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/bitmap.h>
#include <linux/numa.h>



typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
extern nodemask_t _unused_nodemask_arg_;

/**
 * nodemask_pr_args - printf args to output a nodemask
 * @maskp: nodemask to be printed
 *
 * Can be used to provide arguments for '%*pb[l]' when printing a nodemask.
 */

#define nodemask_pr_args(maskp)	__nodemask_pr_numnodes(maskp), \
                                __nodemask_pr_bits(maskp)

static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m) { return m ? MAX_NUMNODES : 0; }

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static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m) { return m ? m->bits : NULL; }

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/* * The inline keyword gives the compiler room to decide to inline, or * not inline a function as it sees best. However, as these functions * are called in both __init and non-__init functions, if they are not * inlined we will end up with a section mis-match error (of the type of * freeable items not being freed). So we must use __always_inline here * to fix the problem. If other functions in the future also end up in * this situation they will also need to be annotated as __always_inline */ #define node_set(node, dst) __node_set((node), &(dst))
static __always_inline void __node_set(int node, volatile nodemask_t *dstp) { set_bit(node, dstp->bits); }

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#define node_clear(node, dst) __node_clear((node), &(dst))
static inline void __node_clear(int node, volatile nodemask_t *dstp) { clear_bit(node, dstp->bits); }

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#define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
static inline void __nodes_setall(nodemask_t *dstp, unsigned int nbits) { bitmap_fill(dstp->bits, nbits); }

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#define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
static inline void __nodes_clear(nodemask_t *dstp, unsigned int nbits) { bitmap_zero(dstp->bits, nbits); }

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/* No static inline type checking - see Subtlety (1) above. */ #define node_isset(node, nodemask) test_bit((node), (nodemask).bits) #define node_test_and_set(node, nodemask) \ __node_test_and_set((node), &(nodemask))
static inline int __node_test_and_set(int node, nodemask_t *addr) { return test_and_set_bit(node, addr->bits); }

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#define nodes_and(dst, src1, src2) \ __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); }

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#define nodes_or(dst, src1, src2) \ __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); }

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#define nodes_xor(dst, src1, src2) \ __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); }

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#define nodes_andnot(dst, src1, src2) \ __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); }

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#define nodes_complement(dst, src) \ __nodes_complement(&(dst), &(src), MAX_NUMNODES)
static inline void __nodes_complement(nodemask_t *dstp, const nodemask_t *srcp, unsigned int nbits) { bitmap_complement(dstp->bits, srcp->bits, nbits); }

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#define nodes_equal(src1, src2) \ __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
static inline int __nodes_equal(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { return bitmap_equal(src1p->bits, src2p->bits, nbits); }

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#define nodes_intersects(src1, src2) \ __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
static inline int __nodes_intersects(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { return bitmap_intersects(src1p->bits, src2p->bits, nbits); }

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#define nodes_subset(src1, src2) \ __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
static inline int __nodes_subset(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { return bitmap_subset(src1p->bits, src2p->bits, nbits); }

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#define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
static inline int __nodes_empty(const nodemask_t *srcp, unsigned int nbits) { return bitmap_empty(srcp->bits, nbits); }

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#define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
static inline int __nodes_full(const nodemask_t *srcp, unsigned int nbits) { return bitmap_full(srcp->bits, nbits); }

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#define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
static inline int __nodes_weight(const nodemask_t *srcp, unsigned int nbits) { return bitmap_weight(srcp->bits, nbits); }

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#define nodes_shift_right(dst, src, n) \ __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
static inline void __nodes_shift_right(nodemask_t *dstp, const nodemask_t *srcp, int n, int nbits) { bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); }

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#define nodes_shift_left(dst, src, n) \ __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
static inline void __nodes_shift_left(nodemask_t *dstp, const nodemask_t *srcp, int n, int nbits) { bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); }

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/* FIXME: better would be to fix all architectures to never return > MAX_NUMNODES, then the silly min_ts could be dropped. */ #define first_node(src) __first_node(&(src))
static inline int __first_node(const nodemask_t *srcp) { return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES)); }

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#define next_node(n, src) __next_node((n), &(src))
static inline int __next_node(int n, const nodemask_t *srcp) { return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1)); }

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/* * Find the next present node in src, starting after node n, wrapping around to * the first node in src if needed. Returns MAX_NUMNODES if src is empty. */ #define next_node_in(n, src) __next_node_in((n), &(src)) int __next_node_in(int node, const nodemask_t *srcp);
static inline void init_nodemask_of_node(nodemask_t *mask, int node) { nodes_clear(*mask); node_set(node, *mask); }

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#define nodemask_of_node(node) \ ({ \ typeof(_unused_nodemask_arg_) m; \ if (sizeof(m) == sizeof(unsigned long)) { \ m.bits[0] = 1UL << (node); \ } else { \ init_nodemask_of_node(&m, (node)); \ } \ m; \ }) #define first_unset_node(mask) __first_unset_node(&(mask))
static inline int __first_unset_node(const nodemask_t *maskp) { return min_t(int,MAX_NUMNODES, find_first_zero_bit(maskp->bits, MAX_NUMNODES)); }

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#define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES) #if MAX_NUMNODES <= BITS_PER_LONG #define NODE_MASK_ALL \ ((nodemask_t) { { \ [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ } }) #else #define NODE_MASK_ALL \ ((nodemask_t) { { \ [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL, \ [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ } }) #endif #define NODE_MASK_NONE \ ((nodemask_t) { { \ [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] = 0UL \ } }) #define nodes_addr(src) ((src).bits) #define nodemask_parse_user(ubuf, ulen, dst) \ __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
static inline int __nodemask_parse_user(const char __user *buf, int len, nodemask_t *dstp, int nbits) { return bitmap_parse_user(buf, len, dstp->bits, nbits); }

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#define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits) { return bitmap_parselist(buf, dstp->bits, nbits); }

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#define node_remap(oldbit, old, new) \ __node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
static inline int __node_remap(int oldbit, const nodemask_t *oldp, const nodemask_t *newp, int nbits) { return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits); }

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#define nodes_remap(dst, src, old, new) \ __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp, const nodemask_t *oldp, const nodemask_t *newp, int nbits) { bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits); }

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#define nodes_onto(dst, orig, relmap) \ __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp, const nodemask_t *relmapp, int nbits) { bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits); }

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#define nodes_fold(dst, orig, sz) \ __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp, int sz, int nbits) { bitmap_fold(dstp->bits, origp->bits, sz, nbits); }

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#if MAX_NUMNODES > 1 #define for_each_node_mask(node, mask) \ for ((node) = first_node(mask); \ (node) < MAX_NUMNODES; \ (node) = next_node((node), (mask))) #else /* MAX_NUMNODES == 1 */ #define for_each_node_mask(node, mask) \ if (!nodes_empty(mask)) \ for ((node) = 0; (node) < 1; (node)++) #endif /* MAX_NUMNODES */ /* * Bitmasks that are kept for all the nodes. */ enum node_states { N_POSSIBLE, /* The node could become online at some point */ N_ONLINE, /* The node is online */ N_NORMAL_MEMORY, /* The node has regular memory */ #ifdef CONFIG_HIGHMEM N_HIGH_MEMORY, /* The node has regular or high memory */ #else N_HIGH_MEMORY = N_NORMAL_MEMORY, #endif N_MEMORY, /* The node has memory(regular, high, movable) */ N_CPU, /* The node has one or more cpus */ NR_NODE_STATES }; /* * The following particular system nodemasks and operations * on them manage all possible and online nodes. */ extern nodemask_t node_states[NR_NODE_STATES]; #if MAX_NUMNODES > 1
static inline int node_state(int node, enum node_states state) { return node_isset(node, node_states[state]); }

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static inline void node_set_state(int node, enum node_states state) { __node_set(node, &node_states[state]); }

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static inline void node_clear_state(int node, enum node_states state) { __node_clear(node, &node_states[state]); }

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static inline int num_node_state(enum node_states state) { return nodes_weight(node_states[state]); }

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#define for_each_node_state(__node, __state) \ for_each_node_mask((__node), node_states[__state]) #define first_online_node first_node(node_states[N_ONLINE]) #define first_memory_node first_node(node_states[N_MEMORY])
static inline int next_online_node(int nid) { return next_node(nid, node_states[N_ONLINE]); }

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static inline int next_memory_node(int nid) { return next_node(nid, node_states[N_MEMORY]); }

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extern int nr_node_ids; extern int nr_online_nodes;
static inline void node_set_online(int nid) { node_set_state(nid, N_ONLINE); nr_online_nodes = num_node_state(N_ONLINE); }

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static inline void node_set_offline(int nid) { node_clear_state(nid, N_ONLINE); nr_online_nodes = num_node_state(N_ONLINE); }

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#else
static inline int node_state(int node, enum node_states state) { return node == 0; }

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static inline void node_set_state(int node, enum node_states state) { }

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static inline void node_clear_state(int node, enum node_states state) { }

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static inline int num_node_state(enum node_states state) { return 1; }

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#define for_each_node_state(node, __state) \ for ( (node) = 0; (node) == 0; (node) = 1) #define first_online_node 0 #define first_memory_node 0 #define next_online_node(nid) (MAX_NUMNODES) #define nr_node_ids 1 #define nr_online_nodes 1 #define node_set_online(node) node_set_state((node), N_ONLINE) #define node_set_offline(node) node_clear_state((node), N_ONLINE) #endif #if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1) extern int node_random(const nodemask_t *maskp); #else
static inline int node_random(const nodemask_t *mask) { return 0; }

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Michal Hocko15100.00%1100.00%
Total15100.00%1100.00%

#endif #define node_online_map node_states[N_ONLINE] #define node_possible_map node_states[N_POSSIBLE] #define num_online_nodes() num_node_state(N_ONLINE) #define num_possible_nodes() num_node_state(N_POSSIBLE) #define node_online(node) node_state((node), N_ONLINE) #define node_possible(node) node_state((node), N_POSSIBLE) #define for_each_node(node) for_each_node_state(node, N_POSSIBLE) #define for_each_online_node(node) for_each_node_state(node, N_ONLINE) /* * For nodemask scrach area. * NODEMASK_ALLOC(type, name) allocates an object with a specified type and * name. */ #if NODES_SHIFT > 8 /* nodemask_t > 256 bytes */ #define NODEMASK_ALLOC(type, name, gfp_flags) \ type *name = kmalloc(sizeof(*name), gfp_flags) #define NODEMASK_FREE(m) kfree(m) #else #define NODEMASK_ALLOC(type, name, gfp_flags) type _##name, *name = &_##name #define NODEMASK_FREE(m) do {} while (0) #endif /* A example struture for using NODEMASK_ALLOC, used in mempolicy. */ struct nodemask_scratch { nodemask_t mask1; nodemask_t mask2; }; #define NODEMASK_SCRATCH(x) \ NODEMASK_ALLOC(struct nodemask_scratch, x, \ GFP_KERNEL | __GFP_NORETRY) #define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x) #endif /* __LINUX_NODEMASK_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Matthew Dobson101852.58%13.45%
Christoph Lameter30715.86%517.24%
Paul Jackson25813.33%310.34%
Kamezawa Hiroyuki794.08%26.90%
David Rientjes593.05%310.34%
Arnd Bergmann452.32%13.45%
Andi Kleen432.22%26.90%
Michal Hocko412.12%13.45%
Lee Schermerhorn291.50%13.45%
Andrew Morton231.19%13.45%
Rasmus Villemoes130.67%13.45%
Tejun Heo70.36%13.45%
Reinette Chatre40.21%13.45%
Greg Banks30.15%13.45%
Lai Jiangshan30.15%26.90%
Tom Rini20.10%13.45%
Miao Xie10.05%13.45%
Greg Kroah-Hartman10.05%13.45%
Total1936100.00%29100.00%
Directory: include/linux
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