1 #ifndef _LINUX_KERNEL_H 2 #define _LINUX_KERNEL_H 3 4 /* 5 * 'kernel.h' contains some often-used function prototypes etc 6 */ 7 #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) 8 #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 9 10 #ifdef __KERNEL__ 11 12 #include <stdarg.h> 13 #include <linux/linkage.h> 14 #include <linux/stddef.h> 15 #include <linux/types.h> 16 #include <linux/compiler.h> 17 #include <linux/bitops.h> 18 #include <linux/log2.h> 19 #include <linux/typecheck.h> 20 #include <linux/printk.h> 21 #include <linux/dynamic_debug.h> 22 #include <asm/byteorder.h> 23 24 #define USHRT_MAX ((u16)(~0U)) 25 #define SHRT_MAX ((s16)(USHRT_MAX>>1)) 26 #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) 27 #define INT_MAX ((int)(~0U>>1)) 28 #define INT_MIN (-INT_MAX - 1) 29 #define UINT_MAX (~0U) 30 #define LONG_MAX ((long)(~0UL>>1)) 31 #define LONG_MIN (-LONG_MAX - 1) 32 #define ULONG_MAX (~0UL) 33 #define LLONG_MAX ((long long)(~0ULL>>1)) 34 #define LLONG_MIN (-LLONG_MAX - 1) 35 #define ULLONG_MAX (~0ULL) 36 37 #define STACK_MAGIC 0xdeadbeef 38 39 #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) 40 #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) 41 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) 42 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) 43 44 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 45 46 /* 47 * This looks more complex than it should be. But we need to 48 * get the type for the ~ right in round_down (it needs to be 49 * as wide as the result!), and we want to evaluate the macro 50 * arguments just once each. 51 */ 52 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 53 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 54 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 55 56 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 57 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 58 #define DIV_ROUND_UP_ULL(ll,d) \ 59 ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; }) 60 61 #if BITS_PER_LONG == 32 62 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) 63 #else 64 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d) 65 #endif 66 67 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ 68 #define roundup(x, y) ( \ 69 { \ 70 const typeof(y) __y = y; \ 71 (((x) + (__y - 1)) / __y) * __y; \ 72 } \ 73 ) 74 #define rounddown(x, y) ( \ 75 { \ 76 typeof(x) __x = (x); \ 77 __x - (__x % (y)); \ 78 } \ 79 ) 80 #define DIV_ROUND_CLOSEST(x, divisor)( \ 81 { \ 82 typeof(divisor) __divisor = divisor; \ 83 (((x) + ((__divisor) / 2)) / (__divisor)); \ 84 } \ 85 ) 86 87 /* 88 * Multiplies an integer by a fraction, while avoiding unnecessary 89 * overflow or loss of precision. 90 */ 91 #define mult_frac(x, numer, denom)( \ 92 { \ 93 typeof(x) quot = (x) / (denom); \ 94 typeof(x) rem = (x) % (denom); \ 95 (quot * (numer)) + ((rem * (numer)) / (denom)); \ 96 } \ 97 ) 98 99 100 #define _RET_IP_ (unsigned long)__builtin_return_address(0) 101 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 102 103 #ifdef CONFIG_LBDAF 104 # include <asm/div64.h> 105 # define sector_div(a, b) do_div(a, b) 106 #else 107 # define sector_div(n, b)( \ 108 { \ 109 int _res; \ 110 _res = (n) % (b); \ 111 (n) /= (b); \ 112 _res; \ 113 } \ 114 ) 115 #endif 116 117 /** 118 * upper_32_bits - return bits 32-63 of a number 119 * @n: the number we're accessing 120 * 121 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 122 * the "right shift count >= width of type" warning when that quantity is 123 * 32-bits. 124 */ 125 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 126 127 /** 128 * lower_32_bits - return bits 0-31 of a number 129 * @n: the number we're accessing 130 */ 131 #define lower_32_bits(n) ((u32)(n)) 132 133 struct completion; 134 struct pt_regs; 135 struct user; 136 137 #ifdef CONFIG_PREEMPT_VOLUNTARY 138 extern int _cond_resched(void); 139 # define might_resched() _cond_resched() 140 #else 141 # define might_resched() do { } while (0) 142 #endif 143 144 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP 145 void __might_sleep(const char *file, int line, int preempt_offset); 146 /** 147 * might_sleep - annotation for functions that can sleep 148 * 149 * this macro will print a stack trace if it is executed in an atomic 150 * context (spinlock, irq-handler, ...). 151 * 152 * This is a useful debugging help to be able to catch problems early and not 153 * be bitten later when the calling function happens to sleep when it is not 154 * supposed to. 155 */ 156 # define might_sleep() \ 157 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) 158 #else 159 static inline void __might_sleep(const char *file, int line, 160 int preempt_offset) { } 161 # define might_sleep() do { might_resched(); } while (0) 162 #endif 163 164 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 165 166 /* 167 * abs() handles unsigned and signed longs, ints, shorts and chars. For all 168 * input types abs() returns a signed long. 169 * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() 170 * for those. 171 */ 172 #define abs(x) ({ \ 173 long ret; \ 174 if (sizeof(x) == sizeof(long)) { \ 175 long __x = (x); \ 176 ret = (__x < 0) ? -__x : __x; \ 177 } else { \ 178 int __x = (x); \ 179 ret = (__x < 0) ? -__x : __x; \ 180 } \ 181 ret; \ 182 }) 183 184 #define abs64(x) ({ \ 185 s64 __x = (x); \ 186 (__x < 0) ? -__x : __x; \ 187 }) 188 189 #ifdef CONFIG_PROVE_LOCKING 190 void might_fault(void); 191 #else 192 static inline void might_fault(void) 193 { 194 might_sleep(); 195 } 196 #endif 197 198 extern struct atomic_notifier_head panic_notifier_list; 199 extern long (*panic_blink)(int state); 200 __printf(1, 2) 201 void panic(const char *fmt, ...) 202 __noreturn __cold; 203 extern void oops_enter(void); 204 extern void oops_exit(void); 205 void print_oops_end_marker(void); 206 extern int oops_may_print(void); 207 void do_exit(long error_code) 208 __noreturn; 209 void complete_and_exit(struct completion *, long) 210 __noreturn; 211 212 /* Internal, do not use. */ 213 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); 214 int __must_check _kstrtol(const char *s, unsigned int base, long *res); 215 216 int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); 217 int __must_check kstrtoll(const char *s, unsigned int base, long long *res); 218 static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) 219 { 220 /* 221 * We want to shortcut function call, but 222 * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. 223 */ 224 if (sizeof(unsigned long) == sizeof(unsigned long long) && 225 __alignof__(unsigned long) == __alignof__(unsigned long long)) 226 return kstrtoull(s, base, (unsigned long long *)res); 227 else 228 return _kstrtoul(s, base, res); 229 } 230 231 static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) 232 { 233 /* 234 * We want to shortcut function call, but 235 * __builtin_types_compatible_p(long, long long) = 0. 236 */ 237 if (sizeof(long) == sizeof(long long) && 238 __alignof__(long) == __alignof__(long long)) 239 return kstrtoll(s, base, (long long *)res); 240 else 241 return _kstrtol(s, base, res); 242 } 243 244 int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); 245 int __must_check kstrtoint(const char *s, unsigned int base, int *res); 246 247 static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) 248 { 249 return kstrtoull(s, base, res); 250 } 251 252 static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) 253 { 254 return kstrtoll(s, base, res); 255 } 256 257 static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) 258 { 259 return kstrtouint(s, base, res); 260 } 261 262 static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) 263 { 264 return kstrtoint(s, base, res); 265 } 266 267 int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); 268 int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); 269 int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); 270 int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); 271 272 int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); 273 int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); 274 int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); 275 int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); 276 int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); 277 int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); 278 int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); 279 int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); 280 int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); 281 int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); 282 283 static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) 284 { 285 return kstrtoull_from_user(s, count, base, res); 286 } 287 288 static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) 289 { 290 return kstrtoll_from_user(s, count, base, res); 291 } 292 293 static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) 294 { 295 return kstrtouint_from_user(s, count, base, res); 296 } 297 298 static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) 299 { 300 return kstrtoint_from_user(s, count, base, res); 301 } 302 303 /* Obsolete, do not use. Use kstrto<foo> instead */ 304 305 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 306 extern long simple_strtol(const char *,char **,unsigned int); 307 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 308 extern long long simple_strtoll(const char *,char **,unsigned int); 309 #define strict_strtoul kstrtoul 310 #define strict_strtol kstrtol 311 #define strict_strtoull kstrtoull 312 #define strict_strtoll kstrtoll 313 314 extern int num_to_str(char *buf, int size, unsigned long long num); 315 316 /* lib/printf utilities */ 317 318 extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); 319 extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); 320 extern __printf(3, 4) 321 int snprintf(char *buf, size_t size, const char *fmt, ...); 322 extern __printf(3, 0) 323 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); 324 extern __printf(3, 4) 325 int scnprintf(char *buf, size_t size, const char *fmt, ...); 326 extern __printf(3, 0) 327 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); 328 extern __printf(2, 3) 329 char *kasprintf(gfp_t gfp, const char *fmt, ...); 330 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 331 332 extern __scanf(2, 3) 333 int sscanf(const char *, const char *, ...); 334 extern __scanf(2, 0) 335 int vsscanf(const char *, const char *, va_list); 336 337 extern int get_option(char **str, int *pint); 338 extern char *get_options(const char *str, int nints, int *ints); 339 extern unsigned long long memparse(const char *ptr, char **retptr); 340 341 extern int core_kernel_text(unsigned long addr); 342 extern int core_kernel_data(unsigned long addr); 343 extern int __kernel_text_address(unsigned long addr); 344 extern int kernel_text_address(unsigned long addr); 345 extern int func_ptr_is_kernel_text(void *ptr); 346 347 struct pid; 348 extern struct pid *session_of_pgrp(struct pid *pgrp); 349 350 unsigned long int_sqrt(unsigned long); 351 352 extern void bust_spinlocks(int yes); 353 extern void wake_up_klogd(void); 354 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 355 extern int panic_timeout; 356 extern int panic_on_oops; 357 extern int panic_on_unrecovered_nmi; 358 extern int panic_on_io_nmi; 359 extern int sysctl_panic_on_stackoverflow; 360 extern const char *print_tainted(void); 361 extern void add_taint(unsigned flag); 362 extern int test_taint(unsigned flag); 363 extern unsigned long get_taint(void); 364 extern int root_mountflags; 365 366 extern bool early_boot_irqs_disabled; 367 368 /* Values used for system_state */ 369 extern enum system_states { 370 SYSTEM_BOOTING, 371 SYSTEM_RUNNING, 372 SYSTEM_HALT, 373 SYSTEM_POWER_OFF, 374 SYSTEM_RESTART, 375 SYSTEM_SUSPEND_DISK, 376 } system_state; 377 378 #define TAINT_PROPRIETARY_MODULE 0 379 #define TAINT_FORCED_MODULE 1 380 #define TAINT_UNSAFE_SMP 2 381 #define TAINT_FORCED_RMMOD 3 382 #define TAINT_MACHINE_CHECK 4 383 #define TAINT_BAD_PAGE 5 384 #define TAINT_USER 6 385 #define TAINT_DIE 7 386 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 387 #define TAINT_WARN 9 388 #define TAINT_CRAP 10 389 #define TAINT_FIRMWARE_WORKAROUND 11 390 #define TAINT_OOT_MODULE 12 391 392 extern const char hex_asc[]; 393 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 394 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 395 396 static inline char *hex_byte_pack(char *buf, u8 byte) 397 { 398 *buf++ = hex_asc_hi(byte); 399 *buf++ = hex_asc_lo(byte); 400 return buf; 401 } 402 403 static inline char * __deprecated pack_hex_byte(char *buf, u8 byte) 404 { 405 return hex_byte_pack(buf, byte); 406 } 407 408 extern int hex_to_bin(char ch); 409 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); 410 411 /* 412 * General tracing related utility functions - trace_printk(), 413 * tracing_on/tracing_off and tracing_start()/tracing_stop 414 * 415 * Use tracing_on/tracing_off when you want to quickly turn on or off 416 * tracing. It simply enables or disables the recording of the trace events. 417 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 418 * file, which gives a means for the kernel and userspace to interact. 419 * Place a tracing_off() in the kernel where you want tracing to end. 420 * From user space, examine the trace, and then echo 1 > tracing_on 421 * to continue tracing. 422 * 423 * tracing_stop/tracing_start has slightly more overhead. It is used 424 * by things like suspend to ram where disabling the recording of the 425 * trace is not enough, but tracing must actually stop because things 426 * like calling smp_processor_id() may crash the system. 427 * 428 * Most likely, you want to use tracing_on/tracing_off. 429 */ 430 #ifdef CONFIG_RING_BUFFER 431 void tracing_on(void); 432 void tracing_off(void); 433 /* trace_off_permanent stops recording with no way to bring it back */ 434 void tracing_off_permanent(void); 435 int tracing_is_on(void); 436 #else 437 static inline void tracing_on(void) { } 438 static inline void tracing_off(void) { } 439 static inline void tracing_off_permanent(void) { } 440 static inline int tracing_is_on(void) { return 0; } 441 #endif 442 443 enum ftrace_dump_mode { 444 DUMP_NONE, 445 DUMP_ALL, 446 DUMP_ORIG, 447 }; 448 449 #ifdef CONFIG_TRACING 450 extern void tracing_start(void); 451 extern void tracing_stop(void); 452 extern void ftrace_off_permanent(void); 453 454 static inline __printf(1, 2) 455 void ____trace_printk_check_format(const char *fmt, ...) 456 { 457 } 458 #define __trace_printk_check_format(fmt, args...) \ 459 do { \ 460 if (0) \ 461 ____trace_printk_check_format(fmt, ##args); \ 462 } while (0) 463 464 /** 465 * trace_printk - printf formatting in the ftrace buffer 466 * @fmt: the printf format for printing 467 * 468 * Note: __trace_printk is an internal function for trace_printk and 469 * the @ip is passed in via the trace_printk macro. 470 * 471 * This function allows a kernel developer to debug fast path sections 472 * that printk is not appropriate for. By scattering in various 473 * printk like tracing in the code, a developer can quickly see 474 * where problems are occurring. 475 * 476 * This is intended as a debugging tool for the developer only. 477 * Please refrain from leaving trace_printks scattered around in 478 * your code. 479 */ 480 481 #define trace_printk(fmt, args...) \ 482 do { \ 483 __trace_printk_check_format(fmt, ##args); \ 484 if (__builtin_constant_p(fmt)) { \ 485 static const char *trace_printk_fmt \ 486 __attribute__((section("__trace_printk_fmt"))) = \ 487 __builtin_constant_p(fmt) ? fmt : NULL; \ 488 \ 489 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 490 } else \ 491 __trace_printk(_THIS_IP_, fmt, ##args); \ 492 } while (0) 493 494 extern __printf(2, 3) 495 int __trace_bprintk(unsigned long ip, const char *fmt, ...); 496 497 extern __printf(2, 3) 498 int __trace_printk(unsigned long ip, const char *fmt, ...); 499 500 extern void trace_dump_stack(void); 501 502 /* 503 * The double __builtin_constant_p is because gcc will give us an error 504 * if we try to allocate the static variable to fmt if it is not a 505 * constant. Even with the outer if statement. 506 */ 507 #define ftrace_vprintk(fmt, vargs) \ 508 do { \ 509 if (__builtin_constant_p(fmt)) { \ 510 static const char *trace_printk_fmt \ 511 __attribute__((section("__trace_printk_fmt"))) = \ 512 __builtin_constant_p(fmt) ? fmt : NULL; \ 513 \ 514 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 515 } else \ 516 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 517 } while (0) 518 519 extern int 520 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 521 522 extern int 523 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 524 525 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 526 #else 527 static inline __printf(1, 2) 528 int trace_printk(const char *fmt, ...); 529 530 static inline void tracing_start(void) { } 531 static inline void tracing_stop(void) { } 532 static inline void ftrace_off_permanent(void) { } 533 static inline void trace_dump_stack(void) { } 534 static inline int 535 trace_printk(const char *fmt, ...) 536 { 537 return 0; 538 } 539 static inline int 540 ftrace_vprintk(const char *fmt, va_list ap) 541 { 542 return 0; 543 } 544 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 545 #endif /* CONFIG_TRACING */ 546 547 /* 548 * min()/max()/clamp() macros that also do 549 * strict type-checking.. See the 550 * "unnecessary" pointer comparison. 551 */ 552 #define min(x, y) ({ \ 553 typeof(x) _min1 = (x); \ 554 typeof(y) _min2 = (y); \ 555 (void) (&_min1 == &_min2); \ 556 _min1 < _min2 ? _min1 : _min2; }) 557 558 #define max(x, y) ({ \ 559 typeof(x) _max1 = (x); \ 560 typeof(y) _max2 = (y); \ 561 (void) (&_max1 == &_max2); \ 562 _max1 > _max2 ? _max1 : _max2; }) 563 564 #define min3(x, y, z) ({ \ 565 typeof(x) _min1 = (x); \ 566 typeof(y) _min2 = (y); \ 567 typeof(z) _min3 = (z); \ 568 (void) (&_min1 == &_min2); \ 569 (void) (&_min1 == &_min3); \ 570 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ 571 (_min2 < _min3 ? _min2 : _min3); }) 572 573 #define max3(x, y, z) ({ \ 574 typeof(x) _max1 = (x); \ 575 typeof(y) _max2 = (y); \ 576 typeof(z) _max3 = (z); \ 577 (void) (&_max1 == &_max2); \ 578 (void) (&_max1 == &_max3); \ 579 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ 580 (_max2 > _max3 ? _max2 : _max3); }) 581 582 /** 583 * min_not_zero - return the minimum that is _not_ zero, unless both are zero 584 * @x: value1 585 * @y: value2 586 */ 587 #define min_not_zero(x, y) ({ \ 588 typeof(x) __x = (x); \ 589 typeof(y) __y = (y); \ 590 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) 591 592 /** 593 * clamp - return a value clamped to a given range with strict typechecking 594 * @val: current value 595 * @min: minimum allowable value 596 * @max: maximum allowable value 597 * 598 * This macro does strict typechecking of min/max to make sure they are of the 599 * same type as val. See the unnecessary pointer comparisons. 600 */ 601 #define clamp(val, min, max) ({ \ 602 typeof(val) __val = (val); \ 603 typeof(min) __min = (min); \ 604 typeof(max) __max = (max); \ 605 (void) (&__val == &__min); \ 606 (void) (&__val == &__max); \ 607 __val = __val < __min ? __min: __val; \ 608 __val > __max ? __max: __val; }) 609 610 /* 611 * ..and if you can't take the strict 612 * types, you can specify one yourself. 613 * 614 * Or not use min/max/clamp at all, of course. 615 */ 616 #define min_t(type, x, y) ({ \ 617 type __min1 = (x); \ 618 type __min2 = (y); \ 619 __min1 < __min2 ? __min1: __min2; }) 620 621 #define max_t(type, x, y) ({ \ 622 type __max1 = (x); \ 623 type __max2 = (y); \ 624 __max1 > __max2 ? __max1: __max2; }) 625 626 /** 627 * clamp_t - return a value clamped to a given range using a given type 628 * @type: the type of variable to use 629 * @val: current value 630 * @min: minimum allowable value 631 * @max: maximum allowable value 632 * 633 * This macro does no typechecking and uses temporary variables of type 634 * 'type' to make all the comparisons. 635 */ 636 #define clamp_t(type, val, min, max) ({ \ 637 type __val = (val); \ 638 type __min = (min); \ 639 type __max = (max); \ 640 __val = __val < __min ? __min: __val; \ 641 __val > __max ? __max: __val; }) 642 643 /** 644 * clamp_val - return a value clamped to a given range using val's type 645 * @val: current value 646 * @min: minimum allowable value 647 * @max: maximum allowable value 648 * 649 * This macro does no typechecking and uses temporary variables of whatever 650 * type the input argument 'val' is. This is useful when val is an unsigned 651 * type and min and max are literals that will otherwise be assigned a signed 652 * integer type. 653 */ 654 #define clamp_val(val, min, max) ({ \ 655 typeof(val) __val = (val); \ 656 typeof(val) __min = (min); \ 657 typeof(val) __max = (max); \ 658 __val = __val < __min ? __min: __val; \ 659 __val > __max ? __max: __val; }) 660 661 662 /* 663 * swap - swap value of @a and @b 664 */ 665 #define swap(a, b) \ 666 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 667 668 /** 669 * container_of - cast a member of a structure out to the containing structure 670 * @ptr: the pointer to the member. 671 * @type: the type of the container struct this is embedded in. 672 * @member: the name of the member within the struct. 673 * 674 */ 675 #define container_of(ptr, type, member) ({ \ 676 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 677 (type *)( (char *)__mptr - offsetof(type,member) );}) 678 679 /* Trap pasters of __FUNCTION__ at compile-time */ 680 #define __FUNCTION__ (__func__) 681 682 /* This helps us to avoid #ifdef CONFIG_NUMA */ 683 #ifdef CONFIG_NUMA 684 #define NUMA_BUILD 1 685 #else 686 #define NUMA_BUILD 0 687 #endif 688 689 /* This helps us avoid #ifdef CONFIG_COMPACTION */ 690 #ifdef CONFIG_COMPACTION 691 #define COMPACTION_BUILD 1 692 #else 693 #define COMPACTION_BUILD 0 694 #endif 695 696 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 697 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 698 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 699 #endif 700 701 struct sysinfo; 702 extern int do_sysinfo(struct sysinfo *info); 703 704 #endif /* __KERNEL__ */ 705 706 #define SI_LOAD_SHIFT 16 707 struct sysinfo { 708 long uptime; /* Seconds since boot */ 709 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 710 unsigned long totalram; /* Total usable main memory size */ 711 unsigned long freeram; /* Available memory size */ 712 unsigned long sharedram; /* Amount of shared memory */ 713 unsigned long bufferram; /* Memory used by buffers */ 714 unsigned long totalswap; /* Total swap space size */ 715 unsigned long freeswap; /* swap space still available */ 716 unsigned short procs; /* Number of current processes */ 717 unsigned short pad; /* explicit padding for m68k */ 718 unsigned long totalhigh; /* Total high memory size */ 719 unsigned long freehigh; /* Available high memory size */ 720 unsigned int mem_unit; /* Memory unit size in bytes */ 721 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 722 }; 723 724 #endif 725