Linux kernel mirror (for testing)
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linux
1#ifndef __LINUX_PERCPU_H
2#define __LINUX_PERCPU_H
3
4#include <linux/preempt.h>
5#include <linux/smp.h>
6#include <linux/cpumask.h>
7#include <linux/pfn.h>
8#include <linux/init.h>
9
10#include <asm/percpu.h>
11
12/* enough to cover all DEFINE_PER_CPUs in modules */
13#ifdef CONFIG_MODULES
14#define PERCPU_MODULE_RESERVE (8 << 10)
15#else
16#define PERCPU_MODULE_RESERVE 0
17#endif
18
19#ifndef PERCPU_ENOUGH_ROOM
20#define PERCPU_ENOUGH_ROOM \
21 (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
22 PERCPU_MODULE_RESERVE)
23#endif
24
25/*
26 * Must be an lvalue. Since @var must be a simple identifier,
27 * we force a syntax error here if it isn't.
28 */
29#define get_cpu_var(var) (*({ \
30 preempt_disable(); \
31 &__get_cpu_var(var); }))
32
33/*
34 * The weird & is necessary because sparse considers (void)(var) to be
35 * a direct dereference of percpu variable (var).
36 */
37#define put_cpu_var(var) do { \
38 (void)&(var); \
39 preempt_enable(); \
40} while (0)
41
42#define get_cpu_ptr(var) ({ \
43 preempt_disable(); \
44 this_cpu_ptr(var); })
45
46#define put_cpu_ptr(var) do { \
47 (void)(var); \
48 preempt_enable(); \
49} while (0)
50
51/* minimum unit size, also is the maximum supported allocation size */
52#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
53
54/*
55 * Percpu allocator can serve percpu allocations before slab is
56 * initialized which allows slab to depend on the percpu allocator.
57 * The following two parameters decide how much resource to
58 * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or
59 * larger than PERCPU_DYNAMIC_EARLY_SIZE.
60 */
61#define PERCPU_DYNAMIC_EARLY_SLOTS 128
62#define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10)
63
64/*
65 * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
66 * back on the first chunk for dynamic percpu allocation if arch is
67 * manually allocating and mapping it for faster access (as a part of
68 * large page mapping for example).
69 *
70 * The following values give between one and two pages of free space
71 * after typical minimal boot (2-way SMP, single disk and NIC) with
72 * both defconfig and a distro config on x86_64 and 32. More
73 * intelligent way to determine this would be nice.
74 */
75#if BITS_PER_LONG > 32
76#define PERCPU_DYNAMIC_RESERVE (20 << 10)
77#else
78#define PERCPU_DYNAMIC_RESERVE (12 << 10)
79#endif
80
81extern void *pcpu_base_addr;
82extern const unsigned long *pcpu_unit_offsets;
83
84struct pcpu_group_info {
85 int nr_units; /* aligned # of units */
86 unsigned long base_offset; /* base address offset */
87 unsigned int *cpu_map; /* unit->cpu map, empty
88 * entries contain NR_CPUS */
89};
90
91struct pcpu_alloc_info {
92 size_t static_size;
93 size_t reserved_size;
94 size_t dyn_size;
95 size_t unit_size;
96 size_t atom_size;
97 size_t alloc_size;
98 size_t __ai_size; /* internal, don't use */
99 int nr_groups; /* 0 if grouping unnecessary */
100 struct pcpu_group_info groups[];
101};
102
103enum pcpu_fc {
104 PCPU_FC_AUTO,
105 PCPU_FC_EMBED,
106 PCPU_FC_PAGE,
107
108 PCPU_FC_NR,
109};
110extern const char *pcpu_fc_names[PCPU_FC_NR];
111
112extern enum pcpu_fc pcpu_chosen_fc;
113
114typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
115 size_t align);
116typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
117typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
118typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
119
120extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
121 int nr_units);
122extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
123
124extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
125 void *base_addr);
126
127#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
128extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
129 size_t atom_size,
130 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
131 pcpu_fc_alloc_fn_t alloc_fn,
132 pcpu_fc_free_fn_t free_fn);
133#endif
134
135#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
136extern int __init pcpu_page_first_chunk(size_t reserved_size,
137 pcpu_fc_alloc_fn_t alloc_fn,
138 pcpu_fc_free_fn_t free_fn,
139 pcpu_fc_populate_pte_fn_t populate_pte_fn);
140#endif
141
142/*
143 * Use this to get to a cpu's version of the per-cpu object
144 * dynamically allocated. Non-atomic access to the current CPU's
145 * version should probably be combined with get_cpu()/put_cpu().
146 */
147#ifdef CONFIG_SMP
148#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
149#else
150#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
151#endif
152
153extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
154extern bool is_kernel_percpu_address(unsigned long addr);
155
156#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
157extern void __init setup_per_cpu_areas(void);
158#endif
159extern void __init percpu_init_late(void);
160
161extern void __percpu *__alloc_percpu(size_t size, size_t align);
162extern void free_percpu(void __percpu *__pdata);
163extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
164
165#define alloc_percpu(type) \
166 (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
167
168/*
169 * Optional methods for optimized non-lvalue per-cpu variable access.
170 *
171 * @var can be a percpu variable or a field of it and its size should
172 * equal char, int or long. percpu_read() evaluates to a lvalue and
173 * all others to void.
174 *
175 * These operations are guaranteed to be atomic w.r.t. preemption.
176 * The generic versions use plain get/put_cpu_var(). Archs are
177 * encouraged to implement single-instruction alternatives which don't
178 * require preemption protection.
179 */
180#ifndef percpu_read
181# define percpu_read(var) \
182 ({ \
183 typeof(var) *pr_ptr__ = &(var); \
184 typeof(var) pr_ret__; \
185 pr_ret__ = get_cpu_var(*pr_ptr__); \
186 put_cpu_var(*pr_ptr__); \
187 pr_ret__; \
188 })
189#endif
190
191#define __percpu_generic_to_op(var, val, op) \
192do { \
193 typeof(var) *pgto_ptr__ = &(var); \
194 get_cpu_var(*pgto_ptr__) op val; \
195 put_cpu_var(*pgto_ptr__); \
196} while (0)
197
198#ifndef percpu_write
199# define percpu_write(var, val) __percpu_generic_to_op(var, (val), =)
200#endif
201
202#ifndef percpu_add
203# define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=)
204#endif
205
206#ifndef percpu_sub
207# define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=)
208#endif
209
210#ifndef percpu_and
211# define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=)
212#endif
213
214#ifndef percpu_or
215# define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=)
216#endif
217
218#ifndef percpu_xor
219# define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=)
220#endif
221
222/*
223 * Branching function to split up a function into a set of functions that
224 * are called for different scalar sizes of the objects handled.
225 */
226
227extern void __bad_size_call_parameter(void);
228
229#define __pcpu_size_call_return(stem, variable) \
230({ typeof(variable) pscr_ret__; \
231 __verify_pcpu_ptr(&(variable)); \
232 switch(sizeof(variable)) { \
233 case 1: pscr_ret__ = stem##1(variable);break; \
234 case 2: pscr_ret__ = stem##2(variable);break; \
235 case 4: pscr_ret__ = stem##4(variable);break; \
236 case 8: pscr_ret__ = stem##8(variable);break; \
237 default: \
238 __bad_size_call_parameter();break; \
239 } \
240 pscr_ret__; \
241})
242
243#define __pcpu_size_call_return2(stem, variable, ...) \
244({ \
245 typeof(variable) pscr2_ret__; \
246 __verify_pcpu_ptr(&(variable)); \
247 switch(sizeof(variable)) { \
248 case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \
249 case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \
250 case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \
251 case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \
252 default: \
253 __bad_size_call_parameter(); break; \
254 } \
255 pscr2_ret__; \
256})
257
258#define __pcpu_size_call(stem, variable, ...) \
259do { \
260 __verify_pcpu_ptr(&(variable)); \
261 switch(sizeof(variable)) { \
262 case 1: stem##1(variable, __VA_ARGS__);break; \
263 case 2: stem##2(variable, __VA_ARGS__);break; \
264 case 4: stem##4(variable, __VA_ARGS__);break; \
265 case 8: stem##8(variable, __VA_ARGS__);break; \
266 default: \
267 __bad_size_call_parameter();break; \
268 } \
269} while (0)
270
271/*
272 * Optimized manipulation for memory allocated through the per cpu
273 * allocator or for addresses of per cpu variables.
274 *
275 * These operation guarantee exclusivity of access for other operations
276 * on the *same* processor. The assumption is that per cpu data is only
277 * accessed by a single processor instance (the current one).
278 *
279 * The first group is used for accesses that must be done in a
280 * preemption safe way since we know that the context is not preempt
281 * safe. Interrupts may occur. If the interrupt modifies the variable
282 * too then RMW actions will not be reliable.
283 *
284 * The arch code can provide optimized functions in two ways:
285 *
286 * 1. Override the function completely. F.e. define this_cpu_add().
287 * The arch must then ensure that the various scalar format passed
288 * are handled correctly.
289 *
290 * 2. Provide functions for certain scalar sizes. F.e. provide
291 * this_cpu_add_2() to provide per cpu atomic operations for 2 byte
292 * sized RMW actions. If arch code does not provide operations for
293 * a scalar size then the fallback in the generic code will be
294 * used.
295 */
296
297#define _this_cpu_generic_read(pcp) \
298({ typeof(pcp) ret__; \
299 preempt_disable(); \
300 ret__ = *this_cpu_ptr(&(pcp)); \
301 preempt_enable(); \
302 ret__; \
303})
304
305#ifndef this_cpu_read
306# ifndef this_cpu_read_1
307# define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp)
308# endif
309# ifndef this_cpu_read_2
310# define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp)
311# endif
312# ifndef this_cpu_read_4
313# define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp)
314# endif
315# ifndef this_cpu_read_8
316# define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp)
317# endif
318# define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp))
319#endif
320
321#define _this_cpu_generic_to_op(pcp, val, op) \
322do { \
323 preempt_disable(); \
324 *__this_cpu_ptr(&(pcp)) op val; \
325 preempt_enable(); \
326} while (0)
327
328#ifndef this_cpu_write
329# ifndef this_cpu_write_1
330# define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
331# endif
332# ifndef this_cpu_write_2
333# define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
334# endif
335# ifndef this_cpu_write_4
336# define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
337# endif
338# ifndef this_cpu_write_8
339# define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
340# endif
341# define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val))
342#endif
343
344#ifndef this_cpu_add
345# ifndef this_cpu_add_1
346# define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=)
347# endif
348# ifndef this_cpu_add_2
349# define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=)
350# endif
351# ifndef this_cpu_add_4
352# define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=)
353# endif
354# ifndef this_cpu_add_8
355# define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=)
356# endif
357# define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val))
358#endif
359
360#ifndef this_cpu_sub
361# define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val))
362#endif
363
364#ifndef this_cpu_inc
365# define this_cpu_inc(pcp) this_cpu_add((pcp), 1)
366#endif
367
368#ifndef this_cpu_dec
369# define this_cpu_dec(pcp) this_cpu_sub((pcp), 1)
370#endif
371
372#ifndef this_cpu_and
373# ifndef this_cpu_and_1
374# define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=)
375# endif
376# ifndef this_cpu_and_2
377# define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=)
378# endif
379# ifndef this_cpu_and_4
380# define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=)
381# endif
382# ifndef this_cpu_and_8
383# define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=)
384# endif
385# define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val))
386#endif
387
388#ifndef this_cpu_or
389# ifndef this_cpu_or_1
390# define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
391# endif
392# ifndef this_cpu_or_2
393# define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
394# endif
395# ifndef this_cpu_or_4
396# define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
397# endif
398# ifndef this_cpu_or_8
399# define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
400# endif
401# define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val))
402#endif
403
404#ifndef this_cpu_xor
405# ifndef this_cpu_xor_1
406# define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=)
407# endif
408# ifndef this_cpu_xor_2
409# define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=)
410# endif
411# ifndef this_cpu_xor_4
412# define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=)
413# endif
414# ifndef this_cpu_xor_8
415# define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=)
416# endif
417# define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val))
418#endif
419
420#define _this_cpu_generic_add_return(pcp, val) \
421({ \
422 typeof(pcp) ret__; \
423 preempt_disable(); \
424 __this_cpu_add(pcp, val); \
425 ret__ = __this_cpu_read(pcp); \
426 preempt_enable(); \
427 ret__; \
428})
429
430#ifndef this_cpu_add_return
431# ifndef this_cpu_add_return_1
432# define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val)
433# endif
434# ifndef this_cpu_add_return_2
435# define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val)
436# endif
437# ifndef this_cpu_add_return_4
438# define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val)
439# endif
440# ifndef this_cpu_add_return_8
441# define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val)
442# endif
443# define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
444#endif
445
446#define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val))
447#define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1)
448#define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1)
449
450#define _this_cpu_generic_xchg(pcp, nval) \
451({ typeof(pcp) ret__; \
452 preempt_disable(); \
453 ret__ = __this_cpu_read(pcp); \
454 __this_cpu_write(pcp, nval); \
455 preempt_enable(); \
456 ret__; \
457})
458
459#ifndef this_cpu_xchg
460# ifndef this_cpu_xchg_1
461# define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
462# endif
463# ifndef this_cpu_xchg_2
464# define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
465# endif
466# ifndef this_cpu_xchg_4
467# define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
468# endif
469# ifndef this_cpu_xchg_8
470# define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
471# endif
472# define this_cpu_xchg(pcp, nval) \
473 __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
474#endif
475
476#define _this_cpu_generic_cmpxchg(pcp, oval, nval) \
477({ typeof(pcp) ret__; \
478 preempt_disable(); \
479 ret__ = __this_cpu_read(pcp); \
480 if (ret__ == (oval)) \
481 __this_cpu_write(pcp, nval); \
482 preempt_enable(); \
483 ret__; \
484})
485
486#ifndef this_cpu_cmpxchg
487# ifndef this_cpu_cmpxchg_1
488# define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
489# endif
490# ifndef this_cpu_cmpxchg_2
491# define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
492# endif
493# ifndef this_cpu_cmpxchg_4
494# define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
495# endif
496# ifndef this_cpu_cmpxchg_8
497# define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
498# endif
499# define this_cpu_cmpxchg(pcp, oval, nval) \
500 __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
501#endif
502
503/*
504 * Generic percpu operations that do not require preemption handling.
505 * Either we do not care about races or the caller has the
506 * responsibility of handling preemptions issues. Arch code can still
507 * override these instructions since the arch per cpu code may be more
508 * efficient and may actually get race freeness for free (that is the
509 * case for x86 for example).
510 *
511 * If there is no other protection through preempt disable and/or
512 * disabling interupts then one of these RMW operations can show unexpected
513 * behavior because the execution thread was rescheduled on another processor
514 * or an interrupt occurred and the same percpu variable was modified from
515 * the interrupt context.
516 */
517#ifndef __this_cpu_read
518# ifndef __this_cpu_read_1
519# define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp)))
520# endif
521# ifndef __this_cpu_read_2
522# define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp)))
523# endif
524# ifndef __this_cpu_read_4
525# define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp)))
526# endif
527# ifndef __this_cpu_read_8
528# define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp)))
529# endif
530# define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp))
531#endif
532
533#define __this_cpu_generic_to_op(pcp, val, op) \
534do { \
535 *__this_cpu_ptr(&(pcp)) op val; \
536} while (0)
537
538#ifndef __this_cpu_write
539# ifndef __this_cpu_write_1
540# define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =)
541# endif
542# ifndef __this_cpu_write_2
543# define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =)
544# endif
545# ifndef __this_cpu_write_4
546# define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =)
547# endif
548# ifndef __this_cpu_write_8
549# define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =)
550# endif
551# define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val))
552#endif
553
554#ifndef __this_cpu_add
555# ifndef __this_cpu_add_1
556# define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=)
557# endif
558# ifndef __this_cpu_add_2
559# define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=)
560# endif
561# ifndef __this_cpu_add_4
562# define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=)
563# endif
564# ifndef __this_cpu_add_8
565# define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=)
566# endif
567# define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val))
568#endif
569
570#ifndef __this_cpu_sub
571# define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val))
572#endif
573
574#ifndef __this_cpu_inc
575# define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1)
576#endif
577
578#ifndef __this_cpu_dec
579# define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1)
580#endif
581
582#ifndef __this_cpu_and
583# ifndef __this_cpu_and_1
584# define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=)
585# endif
586# ifndef __this_cpu_and_2
587# define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=)
588# endif
589# ifndef __this_cpu_and_4
590# define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=)
591# endif
592# ifndef __this_cpu_and_8
593# define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=)
594# endif
595# define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val))
596#endif
597
598#ifndef __this_cpu_or
599# ifndef __this_cpu_or_1
600# define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=)
601# endif
602# ifndef __this_cpu_or_2
603# define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=)
604# endif
605# ifndef __this_cpu_or_4
606# define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=)
607# endif
608# ifndef __this_cpu_or_8
609# define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=)
610# endif
611# define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val))
612#endif
613
614#ifndef __this_cpu_xor
615# ifndef __this_cpu_xor_1
616# define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=)
617# endif
618# ifndef __this_cpu_xor_2
619# define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=)
620# endif
621# ifndef __this_cpu_xor_4
622# define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=)
623# endif
624# ifndef __this_cpu_xor_8
625# define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=)
626# endif
627# define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
628#endif
629
630#define __this_cpu_generic_add_return(pcp, val) \
631({ \
632 __this_cpu_add(pcp, val); \
633 __this_cpu_read(pcp); \
634})
635
636#ifndef __this_cpu_add_return
637# ifndef __this_cpu_add_return_1
638# define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val)
639# endif
640# ifndef __this_cpu_add_return_2
641# define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val)
642# endif
643# ifndef __this_cpu_add_return_4
644# define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val)
645# endif
646# ifndef __this_cpu_add_return_8
647# define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val)
648# endif
649# define __this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
650#endif
651
652#define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val))
653#define __this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1)
654#define __this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1)
655
656#define __this_cpu_generic_xchg(pcp, nval) \
657({ typeof(pcp) ret__; \
658 ret__ = __this_cpu_read(pcp); \
659 __this_cpu_write(pcp, nval); \
660 ret__; \
661})
662
663#ifndef __this_cpu_xchg
664# ifndef __this_cpu_xchg_1
665# define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval)
666# endif
667# ifndef __this_cpu_xchg_2
668# define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval)
669# endif
670# ifndef __this_cpu_xchg_4
671# define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval)
672# endif
673# ifndef __this_cpu_xchg_8
674# define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval)
675# endif
676# define __this_cpu_xchg(pcp, nval) \
677 __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval)
678#endif
679
680#define __this_cpu_generic_cmpxchg(pcp, oval, nval) \
681({ \
682 typeof(pcp) ret__; \
683 ret__ = __this_cpu_read(pcp); \
684 if (ret__ == (oval)) \
685 __this_cpu_write(pcp, nval); \
686 ret__; \
687})
688
689#ifndef __this_cpu_cmpxchg
690# ifndef __this_cpu_cmpxchg_1
691# define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
692# endif
693# ifndef __this_cpu_cmpxchg_2
694# define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
695# endif
696# ifndef __this_cpu_cmpxchg_4
697# define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
698# endif
699# ifndef __this_cpu_cmpxchg_8
700# define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
701# endif
702# define __this_cpu_cmpxchg(pcp, oval, nval) \
703 __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval)
704#endif
705
706/*
707 * IRQ safe versions of the per cpu RMW operations. Note that these operations
708 * are *not* safe against modification of the same variable from another
709 * processors (which one gets when using regular atomic operations)
710 * They are guaranteed to be atomic vs. local interrupts and
711 * preemption only.
712 */
713#define irqsafe_cpu_generic_to_op(pcp, val, op) \
714do { \
715 unsigned long flags; \
716 local_irq_save(flags); \
717 *__this_cpu_ptr(&(pcp)) op val; \
718 local_irq_restore(flags); \
719} while (0)
720
721#ifndef irqsafe_cpu_add
722# ifndef irqsafe_cpu_add_1
723# define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
724# endif
725# ifndef irqsafe_cpu_add_2
726# define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
727# endif
728# ifndef irqsafe_cpu_add_4
729# define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
730# endif
731# ifndef irqsafe_cpu_add_8
732# define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
733# endif
734# define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
735#endif
736
737#ifndef irqsafe_cpu_sub
738# define irqsafe_cpu_sub(pcp, val) irqsafe_cpu_add((pcp), -(val))
739#endif
740
741#ifndef irqsafe_cpu_inc
742# define irqsafe_cpu_inc(pcp) irqsafe_cpu_add((pcp), 1)
743#endif
744
745#ifndef irqsafe_cpu_dec
746# define irqsafe_cpu_dec(pcp) irqsafe_cpu_sub((pcp), 1)
747#endif
748
749#ifndef irqsafe_cpu_and
750# ifndef irqsafe_cpu_and_1
751# define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
752# endif
753# ifndef irqsafe_cpu_and_2
754# define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
755# endif
756# ifndef irqsafe_cpu_and_4
757# define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
758# endif
759# ifndef irqsafe_cpu_and_8
760# define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
761# endif
762# define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
763#endif
764
765#ifndef irqsafe_cpu_or
766# ifndef irqsafe_cpu_or_1
767# define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
768# endif
769# ifndef irqsafe_cpu_or_2
770# define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
771# endif
772# ifndef irqsafe_cpu_or_4
773# define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
774# endif
775# ifndef irqsafe_cpu_or_8
776# define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
777# endif
778# define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
779#endif
780
781#ifndef irqsafe_cpu_xor
782# ifndef irqsafe_cpu_xor_1
783# define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
784# endif
785# ifndef irqsafe_cpu_xor_2
786# define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
787# endif
788# ifndef irqsafe_cpu_xor_4
789# define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
790# endif
791# ifndef irqsafe_cpu_xor_8
792# define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
793# endif
794# define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
795#endif
796
797#define irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) \
798({ \
799 typeof(pcp) ret__; \
800 unsigned long flags; \
801 local_irq_save(flags); \
802 ret__ = __this_cpu_read(pcp); \
803 if (ret__ == (oval)) \
804 __this_cpu_write(pcp, nval); \
805 local_irq_restore(flags); \
806 ret__; \
807})
808
809#ifndef irqsafe_cpu_cmpxchg
810# ifndef irqsafe_cpu_cmpxchg_1
811# define irqsafe_cpu_cmpxchg_1(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
812# endif
813# ifndef irqsafe_cpu_cmpxchg_2
814# define irqsafe_cpu_cmpxchg_2(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
815# endif
816# ifndef irqsafe_cpu_cmpxchg_4
817# define irqsafe_cpu_cmpxchg_4(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
818# endif
819# ifndef irqsafe_cpu_cmpxchg_8
820# define irqsafe_cpu_cmpxchg_8(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
821# endif
822# define irqsafe_cpu_cmpxchg(pcp, oval, nval) \
823 __pcpu_size_call_return2(irqsafe_cpu_cmpxchg_, (pcp), oval, nval)
824#endif
825
826#endif /* __LINUX_PERCPU_H */