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TOMOYO Linux Cross Reference
Linux/include/linux/percpu-defs.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * linux/percpu-defs.h - basic definitions for percpu areas
  4  *
  5  * DO NOT INCLUDE DIRECTLY OUTSIDE PERCPU IMPLEMENTATION PROPER.
  6  *
  7  * This file is separate from linux/percpu.h to avoid cyclic inclusion
  8  * dependency from arch header files.  Only to be included from
  9  * asm/percpu.h.
 10  *
 11  * This file includes macros necessary to declare percpu sections and
 12  * variables, and definitions of percpu accessors and operations.  It
 13  * should provide enough percpu features to arch header files even when
 14  * they can only include asm/percpu.h to avoid cyclic inclusion dependency.
 15  */
 16 
 17 #ifndef _LINUX_PERCPU_DEFS_H
 18 #define _LINUX_PERCPU_DEFS_H
 19 
 20 #ifdef CONFIG_SMP
 21 
 22 #ifdef MODULE
 23 #define PER_CPU_SHARED_ALIGNED_SECTION ""
 24 #define PER_CPU_ALIGNED_SECTION ""
 25 #else
 26 #define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
 27 #define PER_CPU_ALIGNED_SECTION "..shared_aligned"
 28 #endif
 29 #define PER_CPU_FIRST_SECTION "..first"
 30 
 31 #else
 32 
 33 #define PER_CPU_SHARED_ALIGNED_SECTION ""
 34 #define PER_CPU_ALIGNED_SECTION "..shared_aligned"
 35 #define PER_CPU_FIRST_SECTION ""
 36 
 37 #endif
 38 
 39 /*
 40  * Base implementations of per-CPU variable declarations and definitions, where
 41  * the section in which the variable is to be placed is provided by the
 42  * 'sec' argument.  This may be used to affect the parameters governing the
 43  * variable's storage.
 44  *
 45  * NOTE!  The sections for the DECLARE and for the DEFINE must match, lest
 46  * linkage errors occur due the compiler generating the wrong code to access
 47  * that section.
 48  */
 49 #define __PCPU_ATTRS(sec)                                               \
 50         __percpu __attribute__((section(PER_CPU_BASE_SECTION sec)))     \
 51         PER_CPU_ATTRIBUTES
 52 
 53 #define __PCPU_DUMMY_ATTRS                                              \
 54         __section(".discard") __attribute__((unused))
 55 
 56 /*
 57  * s390 and alpha modules require percpu variables to be defined as
 58  * weak to force the compiler to generate GOT based external
 59  * references for them.  This is necessary because percpu sections
 60  * will be located outside of the usually addressable area.
 61  *
 62  * This definition puts the following two extra restrictions when
 63  * defining percpu variables.
 64  *
 65  * 1. The symbol must be globally unique, even the static ones.
 66  * 2. Static percpu variables cannot be defined inside a function.
 67  *
 68  * Archs which need weak percpu definitions should define
 69  * ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary.
 70  *
 71  * To ensure that the generic code observes the above two
 72  * restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak
 73  * definition is used for all cases.
 74  */
 75 #if defined(ARCH_NEEDS_WEAK_PER_CPU) || defined(CONFIG_DEBUG_FORCE_WEAK_PER_CPU)
 76 /*
 77  * __pcpu_scope_* dummy variable is used to enforce scope.  It
 78  * receives the static modifier when it's used in front of
 79  * DEFINE_PER_CPU() and will trigger build failure if
 80  * DECLARE_PER_CPU() is used for the same variable.
 81  *
 82  * __pcpu_unique_* dummy variable is used to enforce symbol uniqueness
 83  * such that hidden weak symbol collision, which will cause unrelated
 84  * variables to share the same address, can be detected during build.
 85  */
 86 #define DECLARE_PER_CPU_SECTION(type, name, sec)                        \
 87         extern __PCPU_DUMMY_ATTRS char __pcpu_scope_##name;             \
 88         extern __PCPU_ATTRS(sec) __typeof__(type) name
 89 
 90 #define DEFINE_PER_CPU_SECTION(type, name, sec)                         \
 91         __PCPU_DUMMY_ATTRS char __pcpu_scope_##name;                    \
 92         extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;            \
 93         __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;                   \
 94         extern __PCPU_ATTRS(sec) __typeof__(type) name;                 \
 95         __PCPU_ATTRS(sec) __weak __typeof__(type) name
 96 #else
 97 /*
 98  * Normal declaration and definition macros.
 99  */
100 #define DECLARE_PER_CPU_SECTION(type, name, sec)                        \
101         extern __PCPU_ATTRS(sec) __typeof__(type) name
102 
103 #define DEFINE_PER_CPU_SECTION(type, name, sec)                         \
104         __PCPU_ATTRS(sec) __typeof__(type) name
105 #endif
106 
107 /*
108  * Variant on the per-CPU variable declaration/definition theme used for
109  * ordinary per-CPU variables.
110  */
111 #define DECLARE_PER_CPU(type, name)                                     \
112         DECLARE_PER_CPU_SECTION(type, name, "")
113 
114 #define DEFINE_PER_CPU(type, name)                                      \
115         DEFINE_PER_CPU_SECTION(type, name, "")
116 
117 /*
118  * Declaration/definition used for per-CPU variables that must come first in
119  * the set of variables.
120  */
121 #define DECLARE_PER_CPU_FIRST(type, name)                               \
122         DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
123 
124 #define DEFINE_PER_CPU_FIRST(type, name)                                \
125         DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
126 
127 /*
128  * Declaration/definition used for per-CPU variables that must be cacheline
129  * aligned under SMP conditions so that, whilst a particular instance of the
130  * data corresponds to a particular CPU, inefficiencies due to direct access by
131  * other CPUs are reduced by preventing the data from unnecessarily spanning
132  * cachelines.
133  *
134  * An example of this would be statistical data, where each CPU's set of data
135  * is updated by that CPU alone, but the data from across all CPUs is collated
136  * by a CPU processing a read from a proc file.
137  */
138 #define DECLARE_PER_CPU_SHARED_ALIGNED(type, name)                      \
139         DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
140         ____cacheline_aligned_in_smp
141 
142 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                       \
143         DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
144         ____cacheline_aligned_in_smp
145 
146 #define DECLARE_PER_CPU_ALIGNED(type, name)                             \
147         DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION)    \
148         ____cacheline_aligned
149 
150 #define DEFINE_PER_CPU_ALIGNED(type, name)                              \
151         DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION)     \
152         ____cacheline_aligned
153 
154 /*
155  * Declaration/definition used for per-CPU variables that must be page aligned.
156  */
157 #define DECLARE_PER_CPU_PAGE_ALIGNED(type, name)                        \
158         DECLARE_PER_CPU_SECTION(type, name, "..page_aligned")           \
159         __aligned(PAGE_SIZE)
160 
161 #define DEFINE_PER_CPU_PAGE_ALIGNED(type, name)                         \
162         DEFINE_PER_CPU_SECTION(type, name, "..page_aligned")            \
163         __aligned(PAGE_SIZE)
164 
165 /*
166  * Declaration/definition used for per-CPU variables that must be read mostly.
167  */
168 #define DECLARE_PER_CPU_READ_MOSTLY(type, name)                 \
169         DECLARE_PER_CPU_SECTION(type, name, "..read_mostly")
170 
171 #define DEFINE_PER_CPU_READ_MOSTLY(type, name)                          \
172         DEFINE_PER_CPU_SECTION(type, name, "..read_mostly")
173 
174 /*
175  * Declaration/definition used for per-CPU variables that should be accessed
176  * as decrypted when memory encryption is enabled in the guest.
177  */
178 #ifdef CONFIG_AMD_MEM_ENCRYPT
179 #define DECLARE_PER_CPU_DECRYPTED(type, name)                           \
180         DECLARE_PER_CPU_SECTION(type, name, "..decrypted")
181 
182 #define DEFINE_PER_CPU_DECRYPTED(type, name)                            \
183         DEFINE_PER_CPU_SECTION(type, name, "..decrypted")
184 #else
185 #define DEFINE_PER_CPU_DECRYPTED(type, name)    DEFINE_PER_CPU(type, name)
186 #endif
187 
188 /*
189  * Intermodule exports for per-CPU variables.  sparse forgets about
190  * address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to
191  * noop if __CHECKER__.
192  */
193 #ifndef __CHECKER__
194 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var)
195 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var)
196 #else
197 #define EXPORT_PER_CPU_SYMBOL(var)
198 #define EXPORT_PER_CPU_SYMBOL_GPL(var)
199 #endif
200 
201 /*
202  * Accessors and operations.
203  */
204 #ifndef __ASSEMBLY__
205 
206 /*
207  * __verify_pcpu_ptr() verifies @ptr is a percpu pointer without evaluating
208  * @ptr and is invoked once before a percpu area is accessed by all
209  * accessors and operations.  This is performed in the generic part of
210  * percpu and arch overrides don't need to worry about it; however, if an
211  * arch wants to implement an arch-specific percpu accessor or operation,
212  * it may use __verify_pcpu_ptr() to verify the parameters.
213  *
214  * + 0 is required in order to convert the pointer type from a
215  * potential array type to a pointer to a single item of the array.
216  */
217 #define __verify_pcpu_ptr(ptr)                                          \
218 do {                                                                    \
219         const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;    \
220         (void)__vpp_verify;                                             \
221 } while (0)
222 
223 #ifdef CONFIG_SMP
224 
225 /*
226  * Add an offset to a pointer but keep the pointer as-is.  Use RELOC_HIDE()
227  * to prevent the compiler from making incorrect assumptions about the
228  * pointer value.  The weird cast keeps both GCC and sparse happy.
229  */
230 #define SHIFT_PERCPU_PTR(__p, __offset)                                 \
231         RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset))
232 
233 #define per_cpu_ptr(ptr, cpu)                                           \
234 ({                                                                      \
235         __verify_pcpu_ptr(ptr);                                         \
236         SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)));                 \
237 })
238 
239 #define raw_cpu_ptr(ptr)                                                \
240 ({                                                                      \
241         __verify_pcpu_ptr(ptr);                                         \
242         arch_raw_cpu_ptr(ptr);                                          \
243 })
244 
245 #ifdef CONFIG_DEBUG_PREEMPT
246 #define this_cpu_ptr(ptr)                                               \
247 ({                                                                      \
248         __verify_pcpu_ptr(ptr);                                         \
249         SHIFT_PERCPU_PTR(ptr, my_cpu_offset);                           \
250 })
251 #else
252 #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
253 #endif
254 
255 #else   /* CONFIG_SMP */
256 
257 #define VERIFY_PERCPU_PTR(__p)                                          \
258 ({                                                                      \
259         __verify_pcpu_ptr(__p);                                         \
260         (typeof(*(__p)) __kernel __force *)(__p);                       \
261 })
262 
263 #define per_cpu_ptr(ptr, cpu)   ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
264 #define raw_cpu_ptr(ptr)        per_cpu_ptr(ptr, 0)
265 #define this_cpu_ptr(ptr)       raw_cpu_ptr(ptr)
266 
267 #endif  /* CONFIG_SMP */
268 
269 #define per_cpu(var, cpu)       (*per_cpu_ptr(&(var), cpu))
270 
271 /*
272  * Must be an lvalue. Since @var must be a simple identifier,
273  * we force a syntax error here if it isn't.
274  */
275 #define get_cpu_var(var)                                                \
276 (*({                                                                    \
277         preempt_disable();                                              \
278         this_cpu_ptr(&var);                                             \
279 }))
280 
281 /*
282  * The weird & is necessary because sparse considers (void)(var) to be
283  * a direct dereference of percpu variable (var).
284  */
285 #define put_cpu_var(var)                                                \
286 do {                                                                    \
287         (void)&(var);                                                   \
288         preempt_enable();                                               \
289 } while (0)
290 
291 #define get_cpu_ptr(var)                                                \
292 ({                                                                      \
293         preempt_disable();                                              \
294         this_cpu_ptr(var);                                              \
295 })
296 
297 #define put_cpu_ptr(var)                                                \
298 do {                                                                    \
299         (void)(var);                                                    \
300         preempt_enable();                                               \
301 } while (0)
302 
303 /*
304  * Branching function to split up a function into a set of functions that
305  * are called for different scalar sizes of the objects handled.
306  */
307 
308 extern void __bad_size_call_parameter(void);
309 
310 #ifdef CONFIG_DEBUG_PREEMPT
311 extern void __this_cpu_preempt_check(const char *op);
312 #else
313 static inline void __this_cpu_preempt_check(const char *op) { }
314 #endif
315 
316 #define __pcpu_size_call_return(stem, variable)                         \
317 ({                                                                      \
318         typeof(variable) pscr_ret__;                                    \
319         __verify_pcpu_ptr(&(variable));                                 \
320         switch(sizeof(variable)) {                                      \
321         case 1: pscr_ret__ = stem##1(variable); break;                  \
322         case 2: pscr_ret__ = stem##2(variable); break;                  \
323         case 4: pscr_ret__ = stem##4(variable); break;                  \
324         case 8: pscr_ret__ = stem##8(variable); break;                  \
325         default:                                                        \
326                 __bad_size_call_parameter(); break;                     \
327         }                                                               \
328         pscr_ret__;                                                     \
329 })
330 
331 #define __pcpu_size_call_return2(stem, variable, ...)                   \
332 ({                                                                      \
333         typeof(variable) pscr2_ret__;                                   \
334         __verify_pcpu_ptr(&(variable));                                 \
335         switch(sizeof(variable)) {                                      \
336         case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
337         case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
338         case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
339         case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
340         default:                                                        \
341                 __bad_size_call_parameter(); break;                     \
342         }                                                               \
343         pscr2_ret__;                                                    \
344 })
345 
346 /*
347  * Special handling for cmpxchg_double.  cmpxchg_double is passed two
348  * percpu variables.  The first has to be aligned to a double word
349  * boundary and the second has to follow directly thereafter.
350  * We enforce this on all architectures even if they don't support
351  * a double cmpxchg instruction, since it's a cheap requirement, and it
352  * avoids breaking the requirement for architectures with the instruction.
353  */
354 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)           \
355 ({                                                                      \
356         bool pdcrb_ret__;                                               \
357         __verify_pcpu_ptr(&(pcp1));                                     \
358         BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
359         VM_BUG_ON((unsigned long)(&(pcp1)) % (2 * sizeof(pcp1)));       \
360         VM_BUG_ON((unsigned long)(&(pcp2)) !=                           \
361                   (unsigned long)(&(pcp1)) + sizeof(pcp1));             \
362         switch(sizeof(pcp1)) {                                          \
363         case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
364         case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
365         case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
366         case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
367         default:                                                        \
368                 __bad_size_call_parameter(); break;                     \
369         }                                                               \
370         pdcrb_ret__;                                                    \
371 })
372 
373 #define __pcpu_size_call(stem, variable, ...)                           \
374 do {                                                                    \
375         __verify_pcpu_ptr(&(variable));                                 \
376         switch(sizeof(variable)) {                                      \
377                 case 1: stem##1(variable, __VA_ARGS__);break;           \
378                 case 2: stem##2(variable, __VA_ARGS__);break;           \
379                 case 4: stem##4(variable, __VA_ARGS__);break;           \
380                 case 8: stem##8(variable, __VA_ARGS__);break;           \
381                 default:                                                \
382                         __bad_size_call_parameter();break;              \
383         }                                                               \
384 } while (0)
385 
386 /*
387  * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
388  *
389  * Optimized manipulation for memory allocated through the per cpu
390  * allocator or for addresses of per cpu variables.
391  *
392  * These operation guarantee exclusivity of access for other operations
393  * on the *same* processor. The assumption is that per cpu data is only
394  * accessed by a single processor instance (the current one).
395  *
396  * The arch code can provide optimized implementation by defining macros
397  * for certain scalar sizes. F.e. provide this_cpu_add_2() to provide per
398  * cpu atomic operations for 2 byte sized RMW actions. If arch code does
399  * not provide operations for a scalar size then the fallback in the
400  * generic code will be used.
401  *
402  * cmpxchg_double replaces two adjacent scalars at once.  The first two
403  * parameters are per cpu variables which have to be of the same size.  A
404  * truth value is returned to indicate success or failure (since a double
405  * register result is difficult to handle).  There is very limited hardware
406  * support for these operations, so only certain sizes may work.
407  */
408 
409 /*
410  * Operations for contexts where we do not want to do any checks for
411  * preemptions.  Unless strictly necessary, always use [__]this_cpu_*()
412  * instead.
413  *
414  * If there is no other protection through preempt disable and/or disabling
415  * interupts then one of these RMW operations can show unexpected behavior
416  * because the execution thread was rescheduled on another processor or an
417  * interrupt occurred and the same percpu variable was modified from the
418  * interrupt context.
419  */
420 #define raw_cpu_read(pcp)               __pcpu_size_call_return(raw_cpu_read_, pcp)
421 #define raw_cpu_write(pcp, val)         __pcpu_size_call(raw_cpu_write_, pcp, val)
422 #define raw_cpu_add(pcp, val)           __pcpu_size_call(raw_cpu_add_, pcp, val)
423 #define raw_cpu_and(pcp, val)           __pcpu_size_call(raw_cpu_and_, pcp, val)
424 #define raw_cpu_or(pcp, val)            __pcpu_size_call(raw_cpu_or_, pcp, val)
425 #define raw_cpu_add_return(pcp, val)    __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
426 #define raw_cpu_xchg(pcp, nval)         __pcpu_size_call_return2(raw_cpu_xchg_, pcp, nval)
427 #define raw_cpu_cmpxchg(pcp, oval, nval) \
428         __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
429 #define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
430         __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
431 
432 #define raw_cpu_sub(pcp, val)           raw_cpu_add(pcp, -(val))
433 #define raw_cpu_inc(pcp)                raw_cpu_add(pcp, 1)
434 #define raw_cpu_dec(pcp)                raw_cpu_sub(pcp, 1)
435 #define raw_cpu_sub_return(pcp, val)    raw_cpu_add_return(pcp, -(typeof(pcp))(val))
436 #define raw_cpu_inc_return(pcp)         raw_cpu_add_return(pcp, 1)
437 #define raw_cpu_dec_return(pcp)         raw_cpu_add_return(pcp, -1)
438 
439 /*
440  * Operations for contexts that are safe from preemption/interrupts.  These
441  * operations verify that preemption is disabled.
442  */
443 #define __this_cpu_read(pcp)                                            \
444 ({                                                                      \
445         __this_cpu_preempt_check("read");                               \
446         raw_cpu_read(pcp);                                              \
447 })
448 
449 #define __this_cpu_write(pcp, val)                                      \
450 ({                                                                      \
451         __this_cpu_preempt_check("write");                              \
452         raw_cpu_write(pcp, val);                                        \
453 })
454 
455 #define __this_cpu_add(pcp, val)                                        \
456 ({                                                                      \
457         __this_cpu_preempt_check("add");                                \
458         raw_cpu_add(pcp, val);                                          \
459 })
460 
461 #define __this_cpu_and(pcp, val)                                        \
462 ({                                                                      \
463         __this_cpu_preempt_check("and");                                \
464         raw_cpu_and(pcp, val);                                          \
465 })
466 
467 #define __this_cpu_or(pcp, val)                                         \
468 ({                                                                      \
469         __this_cpu_preempt_check("or");                                 \
470         raw_cpu_or(pcp, val);                                           \
471 })
472 
473 #define __this_cpu_add_return(pcp, val)                                 \
474 ({                                                                      \
475         __this_cpu_preempt_check("add_return");                         \
476         raw_cpu_add_return(pcp, val);                                   \
477 })
478 
479 #define __this_cpu_xchg(pcp, nval)                                      \
480 ({                                                                      \
481         __this_cpu_preempt_check("xchg");                               \
482         raw_cpu_xchg(pcp, nval);                                        \
483 })
484 
485 #define __this_cpu_cmpxchg(pcp, oval, nval)                             \
486 ({                                                                      \
487         __this_cpu_preempt_check("cmpxchg");                            \
488         raw_cpu_cmpxchg(pcp, oval, nval);                               \
489 })
490 
491 #define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
492 ({      __this_cpu_preempt_check("cmpxchg_double");                     \
493         raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2); \
494 })
495 
496 #define __this_cpu_sub(pcp, val)        __this_cpu_add(pcp, -(typeof(pcp))(val))
497 #define __this_cpu_inc(pcp)             __this_cpu_add(pcp, 1)
498 #define __this_cpu_dec(pcp)             __this_cpu_sub(pcp, 1)
499 #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
500 #define __this_cpu_inc_return(pcp)      __this_cpu_add_return(pcp, 1)
501 #define __this_cpu_dec_return(pcp)      __this_cpu_add_return(pcp, -1)
502 
503 /*
504  * Operations with implied preemption/interrupt protection.  These
505  * operations can be used without worrying about preemption or interrupt.
506  */
507 #define this_cpu_read(pcp)              __pcpu_size_call_return(this_cpu_read_, pcp)
508 #define this_cpu_write(pcp, val)        __pcpu_size_call(this_cpu_write_, pcp, val)
509 #define this_cpu_add(pcp, val)          __pcpu_size_call(this_cpu_add_, pcp, val)
510 #define this_cpu_and(pcp, val)          __pcpu_size_call(this_cpu_and_, pcp, val)
511 #define this_cpu_or(pcp, val)           __pcpu_size_call(this_cpu_or_, pcp, val)
512 #define this_cpu_add_return(pcp, val)   __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
513 #define this_cpu_xchg(pcp, nval)        __pcpu_size_call_return2(this_cpu_xchg_, pcp, nval)
514 #define this_cpu_cmpxchg(pcp, oval, nval) \
515         __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
516 #define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
517         __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
518 
519 #define this_cpu_sub(pcp, val)          this_cpu_add(pcp, -(typeof(pcp))(val))
520 #define this_cpu_inc(pcp)               this_cpu_add(pcp, 1)
521 #define this_cpu_dec(pcp)               this_cpu_sub(pcp, 1)
522 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(typeof(pcp))(val))
523 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
524 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
525 
526 #endif /* __ASSEMBLY__ */
527 #endif /* _LINUX_PERCPU_DEFS_H */
528 

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