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1/*
2 * linux/percpu-defs.h - basic definitions for percpu areas
3 *
4 * DO NOT INCLUDE DIRECTLY OUTSIDE PERCPU IMPLEMENTATION PROPER.
5 *
6 * This file is separate from linux/percpu.h to avoid cyclic inclusion
7 * dependency from arch header files. Only to be included from
8 * asm/percpu.h.
9 *
10 * This file includes macros necessary to declare percpu sections and
11 * variables, and definitions of percpu accessors and operations. It
12 * should provide enough percpu features to arch header files even when
13 * they can only include asm/percpu.h to avoid cyclic inclusion dependency.
14 */
15
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16#ifndef _LINUX_PERCPU_DEFS_H
17#define _LINUX_PERCPU_DEFS_H
18
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19#ifdef CONFIG_SMP
20
21#ifdef MODULE
22#define PER_CPU_SHARED_ALIGNED_SECTION ""
23#define PER_CPU_ALIGNED_SECTION ""
24#else
25#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
26#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
27#endif
28#define PER_CPU_FIRST_SECTION "..first"
29
30#else
31
32#define PER_CPU_SHARED_ALIGNED_SECTION ""
33#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
34#define PER_CPU_FIRST_SECTION ""
35
36#endif
37
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38/*
39 * Base implementations of per-CPU variable declarations and definitions, where
40 * the section in which the variable is to be placed is provided by the
7c756e6e 41 * 'sec' argument. This may be used to affect the parameters governing the
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42 * variable's storage.
43 *
44 * NOTE! The sections for the DECLARE and for the DEFINE must match, lest
45 * linkage errors occur due the compiler generating the wrong code to access
46 * that section.
47 */
7c756e6e 48#define __PCPU_ATTRS(sec) \
e0fdb0e0 49 __percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \
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50 PER_CPU_ATTRIBUTES
51
52#define __PCPU_DUMMY_ATTRS \
53 __attribute__((section(".discard"), unused))
54
55/*
56 * s390 and alpha modules require percpu variables to be defined as
57 * weak to force the compiler to generate GOT based external
58 * references for them. This is necessary because percpu sections
59 * will be located outside of the usually addressable area.
60 *
61 * This definition puts the following two extra restrictions when
62 * defining percpu variables.
63 *
64 * 1. The symbol must be globally unique, even the static ones.
65 * 2. Static percpu variables cannot be defined inside a function.
66 *
67 * Archs which need weak percpu definitions should define
68 * ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary.
69 *
70 * To ensure that the generic code observes the above two
71 * restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak
72 * definition is used for all cases.
73 */
74#if defined(ARCH_NEEDS_WEAK_PER_CPU) || defined(CONFIG_DEBUG_FORCE_WEAK_PER_CPU)
75/*
76 * __pcpu_scope_* dummy variable is used to enforce scope. It
77 * receives the static modifier when it's used in front of
78 * DEFINE_PER_CPU() and will trigger build failure if
79 * DECLARE_PER_CPU() is used for the same variable.
80 *
81 * __pcpu_unique_* dummy variable is used to enforce symbol uniqueness
82 * such that hidden weak symbol collision, which will cause unrelated
83 * variables to share the same address, can be detected during build.
84 */
85#define DECLARE_PER_CPU_SECTION(type, name, sec) \
86 extern __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \
dd17c8f7 87 extern __PCPU_ATTRS(sec) __typeof__(type) name
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88
89#define DEFINE_PER_CPU_SECTION(type, name, sec) \
90 __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \
0f5e4816 91 extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
7c756e6e 92 __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
b1a0fbfd 93 extern __PCPU_ATTRS(sec) __typeof__(type) name; \
c43768cb 94 __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES __weak \
dd17c8f7 95 __typeof__(type) name
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96#else
97/*
98 * Normal declaration and definition macros.
99 */
100#define DECLARE_PER_CPU_SECTION(type, name, sec) \
dd17c8f7 101 extern __PCPU_ATTRS(sec) __typeof__(type) name
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102
103#define DEFINE_PER_CPU_SECTION(type, name, sec) \
c43768cb 104 __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES \
dd17c8f7 105 __typeof__(type) name
7c756e6e 106#endif
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107
108/*
109 * Variant on the per-CPU variable declaration/definition theme used for
110 * ordinary per-CPU variables.
111 */
112#define DECLARE_PER_CPU(type, name) \
113 DECLARE_PER_CPU_SECTION(type, name, "")
114
115#define DEFINE_PER_CPU(type, name) \
116 DEFINE_PER_CPU_SECTION(type, name, "")
117
118/*
119 * Declaration/definition used for per-CPU variables that must come first in
120 * the set of variables.
121 */
122#define DECLARE_PER_CPU_FIRST(type, name) \
123 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
124
125#define DEFINE_PER_CPU_FIRST(type, name) \
126 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
127
128/*
129 * Declaration/definition used for per-CPU variables that must be cacheline
130 * aligned under SMP conditions so that, whilst a particular instance of the
131 * data corresponds to a particular CPU, inefficiencies due to direct access by
132 * other CPUs are reduced by preventing the data from unnecessarily spanning
133 * cachelines.
134 *
135 * An example of this would be statistical data, where each CPU's set of data
136 * is updated by that CPU alone, but the data from across all CPUs is collated
137 * by a CPU processing a read from a proc file.
138 */
139#define DECLARE_PER_CPU_SHARED_ALIGNED(type, name) \
140 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
141 ____cacheline_aligned_in_smp
142
143#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
144 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
145 ____cacheline_aligned_in_smp
146
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147#define DECLARE_PER_CPU_ALIGNED(type, name) \
148 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
149 ____cacheline_aligned
150
151#define DEFINE_PER_CPU_ALIGNED(type, name) \
152 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
153 ____cacheline_aligned
154
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155/*
156 * Declaration/definition used for per-CPU variables that must be page aligned.
157 */
3e352aa8 158#define DECLARE_PER_CPU_PAGE_ALIGNED(type, name) \
3d9a854c 159 DECLARE_PER_CPU_SECTION(type, name, "..page_aligned") \
3e352aa8 160 __aligned(PAGE_SIZE)
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161
162#define DEFINE_PER_CPU_PAGE_ALIGNED(type, name) \
3d9a854c 163 DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \
3e352aa8 164 __aligned(PAGE_SIZE)
5028eaa9 165
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166/*
167 * Declaration/definition used for per-CPU variables that must be read mostly.
168 */
169#define DECLARE_PER_CPU_READ_MOSTLY(type, name) \
330d2822 170 DECLARE_PER_CPU_SECTION(type, name, "..read_mostly")
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171
172#define DEFINE_PER_CPU_READ_MOSTLY(type, name) \
330d2822 173 DEFINE_PER_CPU_SECTION(type, name, "..read_mostly")
c957ef2c 174
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175/*
176 * Declaration/definition used for per-CPU variables that should be accessed
177 * as decrypted when memory encryption is enabled in the guest.
178 */
5d9f90ab 179#ifdef CONFIG_AMD_MEM_ENCRYPT
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180#define DECLARE_PER_CPU_DECRYPTED(type, name) \
181 DECLARE_PER_CPU_SECTION(type, name, "..decrypted")
182
183#define DEFINE_PER_CPU_DECRYPTED(type, name) \
184 DEFINE_PER_CPU_SECTION(type, name, "..decrypted")
185#else
186#define DEFINE_PER_CPU_DECRYPTED(type, name) DEFINE_PER_CPU(type, name)
187#endif
188
5028eaa9 189/*
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190 * Intermodule exports for per-CPU variables. sparse forgets about
191 * address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to
192 * noop if __CHECKER__.
5028eaa9 193 */
545695fb 194#ifndef __CHECKER__
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195#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var)
196#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var)
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197#else
198#define EXPORT_PER_CPU_SYMBOL(var)
199#define EXPORT_PER_CPU_SYMBOL_GPL(var)
200#endif
5028eaa9 201
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202/*
203 * Accessors and operations.
204 */
205#ifndef __ASSEMBLY__
206
9c28278a 207/*
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208 * __verify_pcpu_ptr() verifies @ptr is a percpu pointer without evaluating
209 * @ptr and is invoked once before a percpu area is accessed by all
210 * accessors and operations. This is performed in the generic part of
211 * percpu and arch overrides don't need to worry about it; however, if an
212 * arch wants to implement an arch-specific percpu accessor or operation,
213 * it may use __verify_pcpu_ptr() to verify the parameters.
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214 *
215 * + 0 is required in order to convert the pointer type from a
216 * potential array type to a pointer to a single item of the array.
217 */
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218#define __verify_pcpu_ptr(ptr) \
219do { \
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220 const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
221 (void)__vpp_verify; \
222} while (0)
223
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224#ifdef CONFIG_SMP
225
226/*
227 * Add an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE()
228 * to prevent the compiler from making incorrect assumptions about the
229 * pointer value. The weird cast keeps both GCC and sparse happy.
230 */
eba11788 231#define SHIFT_PERCPU_PTR(__p, __offset) \
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232 RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset))
233
234#define per_cpu_ptr(ptr, cpu) \
eba11788 235({ \
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236 __verify_pcpu_ptr(ptr); \
237 SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))); \
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238})
239
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240#define raw_cpu_ptr(ptr) \
241({ \
242 __verify_pcpu_ptr(ptr); \
243 arch_raw_cpu_ptr(ptr); \
244})
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245
246#ifdef CONFIG_DEBUG_PREEMPT
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247#define this_cpu_ptr(ptr) \
248({ \
249 __verify_pcpu_ptr(ptr); \
250 SHIFT_PERCPU_PTR(ptr, my_cpu_offset); \
251})
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252#else
253#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
254#endif
255
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256#else /* CONFIG_SMP */
257
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258#define VERIFY_PERCPU_PTR(__p) \
259({ \
260 __verify_pcpu_ptr(__p); \
261 (typeof(*(__p)) __kernel __force *)(__p); \
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262})
263
eba11788 264#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
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265#define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
266#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
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267
268#endif /* CONFIG_SMP */
269
3b8ed91d 270#define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
3b8ed91d 271
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272/*
273 * Must be an lvalue. Since @var must be a simple identifier,
274 * we force a syntax error here if it isn't.
275 */
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276#define get_cpu_var(var) \
277(*({ \
278 preempt_disable(); \
279 this_cpu_ptr(&var); \
280}))
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281
282/*
283 * The weird & is necessary because sparse considers (void)(var) to be
284 * a direct dereference of percpu variable (var).
285 */
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286#define put_cpu_var(var) \
287do { \
288 (void)&(var); \
289 preempt_enable(); \
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290} while (0)
291
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292#define get_cpu_ptr(var) \
293({ \
294 preempt_disable(); \
295 this_cpu_ptr(var); \
296})
9defda18 297
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298#define put_cpu_ptr(var) \
299do { \
300 (void)(var); \
301 preempt_enable(); \
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302} while (0)
303
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304/*
305 * Branching function to split up a function into a set of functions that
306 * are called for different scalar sizes of the objects handled.
307 */
308
309extern void __bad_size_call_parameter(void);
310
311#ifdef CONFIG_DEBUG_PREEMPT
312extern void __this_cpu_preempt_check(const char *op);
313#else
314static inline void __this_cpu_preempt_check(const char *op) { }
315#endif
316
317#define __pcpu_size_call_return(stem, variable) \
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318({ \
319 typeof(variable) pscr_ret__; \
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320 __verify_pcpu_ptr(&(variable)); \
321 switch(sizeof(variable)) { \
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322 case 1: pscr_ret__ = stem##1(variable); break; \
323 case 2: pscr_ret__ = stem##2(variable); break; \
324 case 4: pscr_ret__ = stem##4(variable); break; \
325 case 8: pscr_ret__ = stem##8(variable); break; \
a32f8d8e 326 default: \
eba11788 327 __bad_size_call_parameter(); break; \
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328 } \
329 pscr_ret__; \
330})
331
332#define __pcpu_size_call_return2(stem, variable, ...) \
333({ \
334 typeof(variable) pscr2_ret__; \
335 __verify_pcpu_ptr(&(variable)); \
336 switch(sizeof(variable)) { \
337 case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \
338 case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \
339 case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \
340 case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \
341 default: \
342 __bad_size_call_parameter(); break; \
343 } \
344 pscr2_ret__; \
345})
346
347/*
348 * Special handling for cmpxchg_double. cmpxchg_double is passed two
349 * percpu variables. The first has to be aligned to a double word
350 * boundary and the second has to follow directly thereafter.
351 * We enforce this on all architectures even if they don't support
352 * a double cmpxchg instruction, since it's a cheap requirement, and it
353 * avoids breaking the requirement for architectures with the instruction.
354 */
355#define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \
356({ \
357 bool pdcrb_ret__; \
eba11788 358 __verify_pcpu_ptr(&(pcp1)); \
a32f8d8e 359 BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \
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360 VM_BUG_ON((unsigned long)(&(pcp1)) % (2 * sizeof(pcp1))); \
361 VM_BUG_ON((unsigned long)(&(pcp2)) != \
362 (unsigned long)(&(pcp1)) + sizeof(pcp1)); \
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363 switch(sizeof(pcp1)) { \
364 case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \
365 case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \
366 case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \
367 case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \
368 default: \
369 __bad_size_call_parameter(); break; \
370 } \
371 pdcrb_ret__; \
372})
373
374#define __pcpu_size_call(stem, variable, ...) \
375do { \
376 __verify_pcpu_ptr(&(variable)); \
377 switch(sizeof(variable)) { \
378 case 1: stem##1(variable, __VA_ARGS__);break; \
379 case 2: stem##2(variable, __VA_ARGS__);break; \
380 case 4: stem##4(variable, __VA_ARGS__);break; \
381 case 8: stem##8(variable, __VA_ARGS__);break; \
382 default: \
383 __bad_size_call_parameter();break; \
384 } \
385} while (0)
386
387/*
388 * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
389 *
390 * Optimized manipulation for memory allocated through the per cpu
391 * allocator or for addresses of per cpu variables.
392 *
393 * These operation guarantee exclusivity of access for other operations
394 * on the *same* processor. The assumption is that per cpu data is only
395 * accessed by a single processor instance (the current one).
396 *
397 * The arch code can provide optimized implementation by defining macros
398 * for certain scalar sizes. F.e. provide this_cpu_add_2() to provide per
399 * cpu atomic operations for 2 byte sized RMW actions. If arch code does
400 * not provide operations for a scalar size then the fallback in the
401 * generic code will be used.
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402 *
403 * cmpxchg_double replaces two adjacent scalars at once. The first two
404 * parameters are per cpu variables which have to be of the same size. A
405 * truth value is returned to indicate success or failure (since a double
406 * register result is difficult to handle). There is very limited hardware
407 * support for these operations, so only certain sizes may work.
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408 */
409
410/*
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411 * Operations for contexts where we do not want to do any checks for
412 * preemptions. Unless strictly necessary, always use [__]this_cpu_*()
413 * instead.
a32f8d8e 414 *
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415 * If there is no other protection through preempt disable and/or disabling
416 * interupts then one of these RMW operations can show unexpected behavior
417 * because the execution thread was rescheduled on another processor or an
418 * interrupt occurred and the same percpu variable was modified from the
419 * interrupt context.
a32f8d8e 420 */
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421#define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp)
422#define raw_cpu_write(pcp, val) __pcpu_size_call(raw_cpu_write_, pcp, val)
423#define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, pcp, val)
424#define raw_cpu_and(pcp, val) __pcpu_size_call(raw_cpu_and_, pcp, val)
425#define raw_cpu_or(pcp, val) __pcpu_size_call(raw_cpu_or_, pcp, val)
426#define raw_cpu_add_return(pcp, val) __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
427#define raw_cpu_xchg(pcp, nval) __pcpu_size_call_return2(raw_cpu_xchg_, pcp, nval)
428#define raw_cpu_cmpxchg(pcp, oval, nval) \
a32f8d8e 429 __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
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430#define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
431 __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
432
433#define raw_cpu_sub(pcp, val) raw_cpu_add(pcp, -(val))
434#define raw_cpu_inc(pcp) raw_cpu_add(pcp, 1)
435#define raw_cpu_dec(pcp) raw_cpu_sub(pcp, 1)
436#define raw_cpu_sub_return(pcp, val) raw_cpu_add_return(pcp, -(typeof(pcp))(val))
437#define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1)
438#define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1)
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439
440/*
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441 * Operations for contexts that are safe from preemption/interrupts. These
442 * operations verify that preemption is disabled.
a32f8d8e 443 */
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444#define __this_cpu_read(pcp) \
445({ \
446 __this_cpu_preempt_check("read"); \
447 raw_cpu_read(pcp); \
448})
a32f8d8e 449
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450#define __this_cpu_write(pcp, val) \
451({ \
452 __this_cpu_preempt_check("write"); \
453 raw_cpu_write(pcp, val); \
454})
a32f8d8e 455
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456#define __this_cpu_add(pcp, val) \
457({ \
458 __this_cpu_preempt_check("add"); \
cadb1c4d 459 raw_cpu_add(pcp, val); \
eba11788 460})
a32f8d8e 461
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462#define __this_cpu_and(pcp, val) \
463({ \
464 __this_cpu_preempt_check("and"); \
cadb1c4d 465 raw_cpu_and(pcp, val); \
eba11788 466})
a32f8d8e 467
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468#define __this_cpu_or(pcp, val) \
469({ \
470 __this_cpu_preempt_check("or"); \
cadb1c4d 471 raw_cpu_or(pcp, val); \
eba11788 472})
a32f8d8e 473
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474#define __this_cpu_add_return(pcp, val) \
475({ \
476 __this_cpu_preempt_check("add_return"); \
477 raw_cpu_add_return(pcp, val); \
478})
a32f8d8e 479
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480#define __this_cpu_xchg(pcp, nval) \
481({ \
482 __this_cpu_preempt_check("xchg"); \
483 raw_cpu_xchg(pcp, nval); \
484})
a32f8d8e 485
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486#define __this_cpu_cmpxchg(pcp, oval, nval) \
487({ \
488 __this_cpu_preempt_check("cmpxchg"); \
489 raw_cpu_cmpxchg(pcp, oval, nval); \
490})
a32f8d8e 491
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492#define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
493({ __this_cpu_preempt_check("cmpxchg_double"); \
494 raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2); \
495})
a32f8d8e 496
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497#define __this_cpu_sub(pcp, val) __this_cpu_add(pcp, -(typeof(pcp))(val))
498#define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1)
499#define __this_cpu_dec(pcp) __this_cpu_sub(pcp, 1)
500#define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
501#define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1)
502#define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1)
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503
504/*
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505 * Operations with implied preemption/interrupt protection. These
506 * operations can be used without worrying about preemption or interrupt.
a32f8d8e 507 */
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508#define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, pcp)
509#define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
510#define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val)
511#define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, pcp, val)
512#define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, pcp, val)
513#define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
514#define this_cpu_xchg(pcp, nval) __pcpu_size_call_return2(this_cpu_xchg_, pcp, nval)
515#define this_cpu_cmpxchg(pcp, oval, nval) \
516 __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
517#define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
518 __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
519
520#define this_cpu_sub(pcp, val) this_cpu_add(pcp, -(typeof(pcp))(val))
521#define this_cpu_inc(pcp) this_cpu_add(pcp, 1)
522#define this_cpu_dec(pcp) this_cpu_sub(pcp, 1)
a32f8d8e
TH
523#define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(typeof(pcp))(val))
524#define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1)
525#define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1)
a32f8d8e 526
62fde541 527#endif /* __ASSEMBLY__ */
5028eaa9 528#endif /* _LINUX_PERCPU_DEFS_H */