projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __LINUX_PERCPU_H |
| 2 | #define __LINUX_PERCPU_H | |
| 7ff6f082 | 3 | |
| 0a3021f4 | 4 | #include <linux/preempt.h> |
| 1da177e4 | 5 | #include <linux/smp.h> |
| 7ff6f082 | 6 | #include <linux/cpumask.h> |
| 6a242909 | 7 | #include <linux/pfn.h> |
| de380b55 | 8 | #include <linux/init.h> |
| 7ff6f082 | 9 | |
| 1da177e4 LT |
10 | #include <asm/percpu.h> |
| 11 | ||
| 6a242909 | 12 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
| b00742d3 | 13 | #ifdef CONFIG_MODULES |
| 6a242909 | 14 | #define PERCPU_MODULE_RESERVE (8 << 10) |
| b00742d3 | 15 | #else |
| 6a242909 | 16 | #define PERCPU_MODULE_RESERVE 0 |
| 1da177e4 LT |
17 | #endif |
| 18 | ||
| 6a242909 | 19 | #ifndef PERCPU_ENOUGH_ROOM |
| b00742d3 | 20 | #define PERCPU_ENOUGH_ROOM \ |
| 6a242909 TH |
21 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
| 22 | PERCPU_MODULE_RESERVE) | |
| 23 | #endif | |
| b00742d3 | 24 | |
| 632bbfee JB |
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) (*({ \ | |
| 632bbfee JB |
30 | preempt_disable(); \ |
| 31 | &__get_cpu_var(var); })) | |
| f7b64fe8 | 32 | |
| e0fdb0e0 RR |
33 | /* |
| 34 | * The weird & is necessary because sparse considers (void)(var) to be | |
| 35 | * a direct dereference of percpu variable (var). | |
| 36 | */ | |
| f7b64fe8 | 37 | #define put_cpu_var(var) do { \ |
| e0fdb0e0 | 38 | (void)&(var); \ |
| f7b64fe8 TH |
39 | preempt_enable(); \ |
| 40 | } while (0) | |
| 1da177e4 | 41 | |
| 8b8e2ec1 PZ |
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 | ||
| 8d408b4b | 51 | /* minimum unit size, also is the maximum supported allocation size */ |
| 6abad5ac | 52 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
| 8d408b4b | 53 | |
| 099a19d9 TH |
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 | ||
| 8d408b4b TH |
64 | /* |
| 65 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
| 6b19b0c2 TH |
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). | |
| 8d408b4b | 69 | * |
| 6b19b0c2 TH |
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. | |
| 8d408b4b | 74 | */ |
| 6b19b0c2 TH |
75 | #if BITS_PER_LONG > 32 |
| 76 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
| 77 | #else | |
| 78 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
| 79 | #endif | |
| 8d408b4b | 80 | |
| fbf59bc9 | 81 | extern void *pcpu_base_addr; |
| fb435d52 | 82 | extern const unsigned long *pcpu_unit_offsets; |
| 1da177e4 | 83 | |
| fd1e8a1f TH |
84 | struct 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 | ||
| 91 | struct 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 | ||
| f58dc01b TH |
103 | enum pcpu_fc { |
| 104 | PCPU_FC_AUTO, | |
| 105 | PCPU_FC_EMBED, | |
| 106 | PCPU_FC_PAGE, | |
| f58dc01b TH |
107 | |
| 108 | PCPU_FC_NR, | |
| 109 | }; | |
| 110 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
| 111 | ||
| 112 | extern enum pcpu_fc pcpu_chosen_fc; | |
| 113 | ||
| 3cbc8565 TH |
114 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
| 115 | size_t align); | |
| d4b95f80 TH |
116 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
| 117 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
| a530b795 | 118 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
| fbf59bc9 | 119 | |
| fd1e8a1f TH |
120 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
| 121 | int nr_units); | |
| 122 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
| 123 | ||
| fb435d52 TH |
124 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
| 125 | void *base_addr); | |
| 8d408b4b | 126 | |
| 08fc4580 | 127 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
| 4ba6ce25 | 128 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
| c8826dd5 TH |
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); | |
| 08fc4580 | 133 | #endif |
| 66c3a757 | 134 | |
| 08fc4580 | 135 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
| fb435d52 | 136 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
| d4b95f80 TH |
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); | |
| 08fc4580 | 140 | #endif |
| d4b95f80 | 141 | |
| f2a8205c TH |
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 | */ | |
| bbddff05 | 147 | #ifdef CONFIG_SMP |
| fbf59bc9 | 148 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
| bbddff05 TH |
149 | #else |
| 150 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) | |
| 151 | #endif | |
| fbf59bc9 | 152 | |
| e0fdb0e0 | 153 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
| 10fad5e4 | 154 | extern bool is_kernel_percpu_address(unsigned long addr); |
| 1da177e4 | 155 | |
| bbddff05 | 156 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
| e74e3962 TH |
157 | extern void __init setup_per_cpu_areas(void); |
| 158 | #endif | |
| 099a19d9 | 159 | extern void __init percpu_init_late(void); |
| e74e3962 | 160 | |
| de380b55 TH |
161 | extern void __percpu *__alloc_percpu(size_t size, size_t align); |
| 162 | extern void free_percpu(void __percpu *__pdata); | |
| 163 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); | |
| 164 | ||
| 64ef291f | 165 | #define alloc_percpu(type) \ |
| e0fdb0e0 | 166 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
| 1da177e4 | 167 | |
| 066123a5 TH |
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 | ({ \ | |
| f7b64fe8 TH |
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__; \ | |
| 066123a5 TH |
188 | }) |
| 189 | #endif | |
| 190 | ||
| 191 | #define __percpu_generic_to_op(var, val, op) \ | |
| 192 | do { \ | |
| f7b64fe8 TH |
193 | typeof(var) *pgto_ptr__ = &(var); \ |
| 194 | get_cpu_var(*pgto_ptr__) op val; \ | |
| 195 | put_cpu_var(*pgto_ptr__); \ | |
| 066123a5 TH |
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 | ||
| 7340a0b1 CL |
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 | ||
| 227 | extern void __bad_size_call_parameter(void); | |
| 228 | ||
| 0f5e4816 TH |
229 | #define __pcpu_size_call_return(stem, variable) \ |
| 230 | ({ typeof(variable) pscr_ret__; \ | |
| 545695fb | 231 | __verify_pcpu_ptr(&(variable)); \ |
| 7340a0b1 | 232 | switch(sizeof(variable)) { \ |
| 0f5e4816 TH |
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; \ | |
| 7340a0b1 CL |
237 | default: \ |
| 238 | __bad_size_call_parameter();break; \ | |
| 239 | } \ | |
| 0f5e4816 | 240 | pscr_ret__; \ |
| 7340a0b1 CL |
241 | }) |
| 242 | ||
| a663ffff CL |
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 | ||
| 0f5e4816 | 258 | #define __pcpu_size_call(stem, variable, ...) \ |
| 7340a0b1 | 259 | do { \ |
| 545695fb | 260 | __verify_pcpu_ptr(&(variable)); \ |
| 7340a0b1 CL |
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 | |
| dd17c8f7 | 273 | * allocator or for addresses of per cpu variables. |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 318 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
| 7340a0b1 CL |
319 | #endif |
| 320 | ||
| 321 | #define _this_cpu_generic_to_op(pcp, val, op) \ | |
| 322 | do { \ | |
| 323 | preempt_disable(); \ | |
| f7b64fe8 | 324 | *__this_cpu_ptr(&(pcp)) op val; \ |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 341 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 357 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 385 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 401 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 417 | # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
| 7340a0b1 CL |
418 | #endif |
| 419 | ||
| 40304775 TH |
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 | ||
| 2b712442 CL |
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 | ||
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 530 | # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) |
| 7340a0b1 CL |
531 | #endif |
| 532 | ||
| 533 | #define __this_cpu_generic_to_op(pcp, val, op) \ | |
| 534 | do { \ | |
| 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 | |
| 0f5e4816 | 551 | # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 567 | # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 595 | # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 611 | # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 627 | # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) |
| 7340a0b1 CL |
628 | #endif |
| 629 | ||
| a663ffff CL |
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 | ||
| 2b712442 CL |
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 | ||
| 7340a0b1 CL |
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) | |
| 2b712442 | 710 | * They are guaranteed to be atomic vs. local interrupts and |
| 7340a0b1 CL |
711 | * preemption only. |
| 712 | */ | |
| 713 | #define irqsafe_cpu_generic_to_op(pcp, val, op) \ | |
| 714 | do { \ | |
| 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 | |
| 0f5e4816 | 734 | # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 762 | # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 778 | # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val)) |
| 7340a0b1 CL |
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 | |
| 0f5e4816 | 794 | # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val)) |
| 7340a0b1 CL |
795 | #endif |
| 796 | ||
| 2b712442 CL |
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 | ||
| 1da177e4 | 826 | #endif /* __LINUX_PERCPU_H */ |