1 #ifndef _LINUX_KERNEL_H 2 #define _LINUX_KERNEL_H 3 4 /* 5 * 'kernel.h' contains some often-used function prototypes etc 6 */ 7 8 #ifdef __KERNEL__ 9 10 #include <stdarg.h> 11 #include <linux/linkage.h> 12 #include <linux/stddef.h> 13 #include <linux/types.h> 14 #include <linux/compiler.h> 15 #include <linux/bitops.h> 16 #include <linux/log2.h> 17 #include <linux/typecheck.h> 18 #include <linux/ratelimit.h> 19 #include <linux/dynamic_printk.h> 20 #include <asm/byteorder.h> 21 #include <asm/bug.h> 22 23 extern const char linux_banner[]; 24 extern const char linux_proc_banner[]; 25 26 #define USHORT_MAX ((u16)(~0U)) 27 #define SHORT_MAX ((s16)(USHORT_MAX>>1)) 28 #define SHORT_MIN (-SHORT_MAX - 1) 29 #define INT_MAX ((int)(~0U>>1)) 30 #define INT_MIN (-INT_MAX - 1) 31 #define UINT_MAX (~0U) 32 #define LONG_MAX ((long)(~0UL>>1)) 33 #define LONG_MIN (-LONG_MAX - 1) 34 #define ULONG_MAX (~0UL) 35 #define LLONG_MAX ((long long)(~0ULL>>1)) 36 #define LLONG_MIN (-LLONG_MAX - 1) 37 #define ULLONG_MAX (~0ULL) 38 39 #define STACK_MAGIC 0xdeadbeef 40 41 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) 42 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) 43 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) 44 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) 45 46 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 47 48 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 49 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 50 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 51 #define DIV_ROUND_CLOSEST(x, divisor)( \ 52 { \ 53 typeof(divisor) __divisor = divisor; \ 54 (((x) + ((__divisor) / 2)) / (__divisor)); \ 55 } \ 56 ) 57 58 #define _RET_IP_ (unsigned long)__builtin_return_address(0) 59 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 60 61 #ifdef CONFIG_LBD 62 # include <asm/div64.h> 63 # define sector_div(a, b) do_div(a, b) 64 #else 65 # define sector_div(n, b)( \ 66 { \ 67 int _res; \ 68 _res = (n) % (b); \ 69 (n) /= (b); \ 70 _res; \ 71 } \ 72 ) 73 #endif 74 75 /** 76 * upper_32_bits - return bits 32-63 of a number 77 * @n: the number we're accessing 78 * 79 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 80 * the "right shift count >= width of type" warning when that quantity is 81 * 32-bits. 82 */ 83 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 84 85 /** 86 * lower_32_bits - return bits 0-31 of a number 87 * @n: the number we're accessing 88 */ 89 #define lower_32_bits(n) ((u32)(n)) 90 91 #define KERN_EMERG "<0>" /* system is unusable */ 92 #define KERN_ALERT "<1>" /* action must be taken immediately */ 93 #define KERN_CRIT "<2>" /* critical conditions */ 94 #define KERN_ERR "<3>" /* error conditions */ 95 #define KERN_WARNING "<4>" /* warning conditions */ 96 #define KERN_NOTICE "<5>" /* normal but significant condition */ 97 #define KERN_INFO "<6>" /* informational */ 98 #define KERN_DEBUG "<7>" /* debug-level messages */ 99 100 /* 101 * Annotation for a "continued" line of log printout (only done after a 102 * line that had no enclosing \n). Only to be used by core/arch code 103 * during early bootup (a continued line is not SMP-safe otherwise). 104 */ 105 #define KERN_CONT "" 106 107 extern int console_printk[]; 108 109 #define console_loglevel (console_printk[0]) 110 #define default_message_loglevel (console_printk[1]) 111 #define minimum_console_loglevel (console_printk[2]) 112 #define default_console_loglevel (console_printk[3]) 113 114 struct completion; 115 struct pt_regs; 116 struct user; 117 118 #ifdef CONFIG_PREEMPT_VOLUNTARY 119 extern int _cond_resched(void); 120 # define might_resched() _cond_resched() 121 #else 122 # define might_resched() do { } while (0) 123 #endif 124 125 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 126 void __might_sleep(char *file, int line); 127 /** 128 * might_sleep - annotation for functions that can sleep 129 * 130 * this macro will print a stack trace if it is executed in an atomic 131 * context (spinlock, irq-handler, ...). 132 * 133 * This is a useful debugging help to be able to catch problems early and not 134 * be bitten later when the calling function happens to sleep when it is not 135 * supposed to. 136 */ 137 # define might_sleep() \ 138 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 139 #else 140 # define might_sleep() do { might_resched(); } while (0) 141 #endif 142 143 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 144 145 #define abs(x) ({ \ 146 int __x = (x); \ 147 (__x < 0) ? -__x : __x; \ 148 }) 149 150 #ifdef CONFIG_PROVE_LOCKING 151 void might_fault(void); 152 #else 153 static inline void might_fault(void) 154 { 155 might_sleep(); 156 } 157 #endif 158 159 extern struct atomic_notifier_head panic_notifier_list; 160 extern long (*panic_blink)(long time); 161 NORET_TYPE void panic(const char * fmt, ...) 162 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 163 extern void oops_enter(void); 164 extern void oops_exit(void); 165 extern int oops_may_print(void); 166 NORET_TYPE void do_exit(long error_code) 167 ATTRIB_NORET; 168 NORET_TYPE void complete_and_exit(struct completion *, long) 169 ATTRIB_NORET; 170 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 171 extern long simple_strtol(const char *,char **,unsigned int); 172 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 173 extern long long simple_strtoll(const char *,char **,unsigned int); 174 extern int strict_strtoul(const char *, unsigned int, unsigned long *); 175 extern int strict_strtol(const char *, unsigned int, long *); 176 extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 177 extern int strict_strtoll(const char *, unsigned int, long long *); 178 extern int sprintf(char * buf, const char * fmt, ...) 179 __attribute__ ((format (printf, 2, 3))); 180 extern int vsprintf(char *buf, const char *, va_list) 181 __attribute__ ((format (printf, 2, 0))); 182 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 183 __attribute__ ((format (printf, 3, 4))); 184 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 185 __attribute__ ((format (printf, 3, 0))); 186 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 187 __attribute__ ((format (printf, 3, 4))); 188 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 189 __attribute__ ((format (printf, 3, 0))); 190 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 191 __attribute__ ((format (printf, 2, 3))); 192 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 193 194 extern int sscanf(const char *, const char *, ...) 195 __attribute__ ((format (scanf, 2, 3))); 196 extern int vsscanf(const char *, const char *, va_list) 197 __attribute__ ((format (scanf, 2, 0))); 198 199 extern int get_option(char **str, int *pint); 200 extern char *get_options(const char *str, int nints, int *ints); 201 extern unsigned long long memparse(const char *ptr, char **retptr); 202 203 extern int core_kernel_text(unsigned long addr); 204 extern int __kernel_text_address(unsigned long addr); 205 extern int kernel_text_address(unsigned long addr); 206 extern int func_ptr_is_kernel_text(void *ptr); 207 208 struct pid; 209 extern struct pid *session_of_pgrp(struct pid *pgrp); 210 211 /* 212 * FW_BUG 213 * Add this to a message where you are sure the firmware is buggy or behaves 214 * really stupid or out of spec. Be aware that the responsible BIOS developer 215 * should be able to fix this issue or at least get a concrete idea of the 216 * problem by reading your message without the need of looking at the kernel 217 * code. 218 * 219 * Use it for definite and high priority BIOS bugs. 220 * 221 * FW_WARN 222 * Use it for not that clear (e.g. could the kernel messed up things already?) 223 * and medium priority BIOS bugs. 224 * 225 * FW_INFO 226 * Use this one if you want to tell the user or vendor about something 227 * suspicious, but generally harmless related to the firmware. 228 * 229 * Use it for information or very low priority BIOS bugs. 230 */ 231 #define FW_BUG "[Firmware Bug]: " 232 #define FW_WARN "[Firmware Warn]: " 233 #define FW_INFO "[Firmware Info]: " 234 235 #ifdef CONFIG_PRINTK 236 asmlinkage int vprintk(const char *fmt, va_list args) 237 __attribute__ ((format (printf, 1, 0))); 238 asmlinkage int printk(const char * fmt, ...) 239 __attribute__ ((format (printf, 1, 2))) __cold; 240 241 extern struct ratelimit_state printk_ratelimit_state; 242 extern int printk_ratelimit(void); 243 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 244 unsigned int interval_msec); 245 246 /* 247 * Print a one-time message (analogous to WARN_ONCE() et al): 248 */ 249 #define printk_once(x...) ({ \ 250 static int __print_once = 1; \ 251 \ 252 if (__print_once) { \ 253 __print_once = 0; \ 254 printk(x); \ 255 } \ 256 }) 257 258 #else 259 static inline int vprintk(const char *s, va_list args) 260 __attribute__ ((format (printf, 1, 0))); 261 static inline int vprintk(const char *s, va_list args) { return 0; } 262 static inline int printk(const char *s, ...) 263 __attribute__ ((format (printf, 1, 2))); 264 static inline int __cold printk(const char *s, ...) { return 0; } 265 static inline int printk_ratelimit(void) { return 0; } 266 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 267 unsigned int interval_msec) \ 268 { return false; } 269 270 /* No effect, but we still get type checking even in the !PRINTK case: */ 271 #define printk_once(x...) printk(x) 272 273 #endif 274 275 extern int printk_needs_cpu(int cpu); 276 extern void printk_tick(void); 277 278 extern void asmlinkage __attribute__((format(printf, 1, 2))) 279 early_printk(const char *fmt, ...); 280 281 unsigned long int_sqrt(unsigned long); 282 283 static inline void console_silent(void) 284 { 285 console_loglevel = 0; 286 } 287 288 static inline void console_verbose(void) 289 { 290 if (console_loglevel) 291 console_loglevel = 15; 292 } 293 294 extern void bust_spinlocks(int yes); 295 extern void wake_up_klogd(void); 296 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 297 extern int panic_timeout; 298 extern int panic_on_oops; 299 extern int panic_on_unrecovered_nmi; 300 extern const char *print_tainted(void); 301 extern void add_taint(unsigned flag); 302 extern int test_taint(unsigned flag); 303 extern unsigned long get_taint(void); 304 extern int root_mountflags; 305 306 /* Values used for system_state */ 307 extern enum system_states { 308 SYSTEM_BOOTING, 309 SYSTEM_RUNNING, 310 SYSTEM_HALT, 311 SYSTEM_POWER_OFF, 312 SYSTEM_RESTART, 313 SYSTEM_SUSPEND_DISK, 314 } system_state; 315 316 #define TAINT_PROPRIETARY_MODULE 0 317 #define TAINT_FORCED_MODULE 1 318 #define TAINT_UNSAFE_SMP 2 319 #define TAINT_FORCED_RMMOD 3 320 #define TAINT_MACHINE_CHECK 4 321 #define TAINT_BAD_PAGE 5 322 #define TAINT_USER 6 323 #define TAINT_DIE 7 324 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 325 #define TAINT_WARN 9 326 #define TAINT_CRAP 10 327 328 extern void dump_stack(void) __cold; 329 330 enum { 331 DUMP_PREFIX_NONE, 332 DUMP_PREFIX_ADDRESS, 333 DUMP_PREFIX_OFFSET 334 }; 335 extern void hex_dump_to_buffer(const void *buf, size_t len, 336 int rowsize, int groupsize, 337 char *linebuf, size_t linebuflen, bool ascii); 338 extern void print_hex_dump(const char *level, const char *prefix_str, 339 int prefix_type, int rowsize, int groupsize, 340 const void *buf, size_t len, bool ascii); 341 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 342 const void *buf, size_t len); 343 344 extern const char hex_asc[]; 345 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 346 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 347 348 static inline char *pack_hex_byte(char *buf, u8 byte) 349 { 350 *buf++ = hex_asc_hi(byte); 351 *buf++ = hex_asc_lo(byte); 352 return buf; 353 } 354 355 #ifndef pr_fmt 356 #define pr_fmt(fmt) fmt 357 #endif 358 359 #define pr_emerg(fmt, ...) \ 360 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 361 #define pr_alert(fmt, ...) \ 362 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 363 #define pr_crit(fmt, ...) \ 364 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 365 #define pr_err(fmt, ...) \ 366 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 367 #define pr_warning(fmt, ...) \ 368 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 369 #define pr_notice(fmt, ...) \ 370 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 371 #define pr_info(fmt, ...) \ 372 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 373 374 /* If you are writing a driver, please use dev_dbg instead */ 375 #if defined(DEBUG) 376 #define pr_debug(fmt, ...) \ 377 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 378 #elif defined(CONFIG_DYNAMIC_PRINTK_DEBUG) 379 #define pr_debug(fmt, ...) do { \ 380 dynamic_pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \ 381 } while (0) 382 #else 383 #define pr_debug(fmt, ...) \ 384 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 385 #endif 386 387 /* 388 * General tracing related utility functions - trace_printk(), 389 * tracing_on/tracing_off and tracing_start()/tracing_stop 390 * 391 * Use tracing_on/tracing_off when you want to quickly turn on or off 392 * tracing. It simply enables or disables the recording of the trace events. 393 * This also corresponds to the user space debugfs/tracing/tracing_on 394 * file, which gives a means for the kernel and userspace to interact. 395 * Place a tracing_off() in the kernel where you want tracing to end. 396 * From user space, examine the trace, and then echo 1 > tracing_on 397 * to continue tracing. 398 * 399 * tracing_stop/tracing_start has slightly more overhead. It is used 400 * by things like suspend to ram where disabling the recording of the 401 * trace is not enough, but tracing must actually stop because things 402 * like calling smp_processor_id() may crash the system. 403 * 404 * Most likely, you want to use tracing_on/tracing_off. 405 */ 406 #ifdef CONFIG_RING_BUFFER 407 void tracing_on(void); 408 void tracing_off(void); 409 /* trace_off_permanent stops recording with no way to bring it back */ 410 void tracing_off_permanent(void); 411 int tracing_is_on(void); 412 #else 413 static inline void tracing_on(void) { } 414 static inline void tracing_off(void) { } 415 static inline void tracing_off_permanent(void) { } 416 static inline int tracing_is_on(void) { return 0; } 417 #endif 418 #ifdef CONFIG_TRACING 419 extern void tracing_start(void); 420 extern void tracing_stop(void); 421 extern void ftrace_off_permanent(void); 422 423 extern void 424 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); 425 426 static inline void __attribute__ ((format (printf, 1, 2))) 427 ____trace_printk_check_format(const char *fmt, ...) 428 { 429 } 430 #define __trace_printk_check_format(fmt, args...) \ 431 do { \ 432 if (0) \ 433 ____trace_printk_check_format(fmt, ##args); \ 434 } while (0) 435 436 /** 437 * trace_printk - printf formatting in the ftrace buffer 438 * @fmt: the printf format for printing 439 * 440 * Note: __trace_printk is an internal function for trace_printk and 441 * the @ip is passed in via the trace_printk macro. 442 * 443 * This function allows a kernel developer to debug fast path sections 444 * that printk is not appropriate for. By scattering in various 445 * printk like tracing in the code, a developer can quickly see 446 * where problems are occurring. 447 * 448 * This is intended as a debugging tool for the developer only. 449 * Please refrain from leaving trace_printks scattered around in 450 * your code. 451 */ 452 453 #define trace_printk(fmt, args...) \ 454 do { \ 455 __trace_printk_check_format(fmt, ##args); \ 456 if (__builtin_constant_p(fmt)) { \ 457 static const char *trace_printk_fmt \ 458 __attribute__((section("__trace_printk_fmt"))) = \ 459 __builtin_constant_p(fmt) ? fmt : NULL; \ 460 \ 461 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 462 } else \ 463 __trace_printk(_THIS_IP_, fmt, ##args); \ 464 } while (0) 465 466 extern int 467 __trace_bprintk(unsigned long ip, const char *fmt, ...) 468 __attribute__ ((format (printf, 2, 3))); 469 470 extern int 471 __trace_printk(unsigned long ip, const char *fmt, ...) 472 __attribute__ ((format (printf, 2, 3))); 473 474 /* 475 * The double __builtin_constant_p is because gcc will give us an error 476 * if we try to allocate the static variable to fmt if it is not a 477 * constant. Even with the outer if statement. 478 */ 479 #define ftrace_vprintk(fmt, vargs) \ 480 do { \ 481 if (__builtin_constant_p(fmt)) { \ 482 static const char *trace_printk_fmt \ 483 __attribute__((section("__trace_printk_fmt"))) = \ 484 __builtin_constant_p(fmt) ? fmt : NULL; \ 485 \ 486 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 487 } else \ 488 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 489 } while (0) 490 491 extern int 492 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 493 494 extern int 495 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 496 497 extern void ftrace_dump(void); 498 #else 499 static inline void 500 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } 501 static inline int 502 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 503 504 static inline void tracing_start(void) { } 505 static inline void tracing_stop(void) { } 506 static inline void ftrace_off_permanent(void) { } 507 static inline int 508 trace_printk(const char *fmt, ...) 509 { 510 return 0; 511 } 512 static inline int 513 ftrace_vprintk(const char *fmt, va_list ap) 514 { 515 return 0; 516 } 517 static inline void ftrace_dump(void) { } 518 #endif /* CONFIG_TRACING */ 519 520 /* 521 * Display an IP address in readable format. 522 */ 523 524 #define NIPQUAD(addr) \ 525 ((unsigned char *)&addr)[0], \ 526 ((unsigned char *)&addr)[1], \ 527 ((unsigned char *)&addr)[2], \ 528 ((unsigned char *)&addr)[3] 529 #define NIPQUAD_FMT "%u.%u.%u.%u" 530 531 #if defined(__LITTLE_ENDIAN) 532 #define HIPQUAD(addr) \ 533 ((unsigned char *)&addr)[3], \ 534 ((unsigned char *)&addr)[2], \ 535 ((unsigned char *)&addr)[1], \ 536 ((unsigned char *)&addr)[0] 537 #elif defined(__BIG_ENDIAN) 538 #define HIPQUAD NIPQUAD 539 #else 540 #error "Please fix asm/byteorder.h" 541 #endif /* __LITTLE_ENDIAN */ 542 543 /* 544 * min()/max()/clamp() macros that also do 545 * strict type-checking.. See the 546 * "unnecessary" pointer comparison. 547 */ 548 #define min(x, y) ({ \ 549 typeof(x) _min1 = (x); \ 550 typeof(y) _min2 = (y); \ 551 (void) (&_min1 == &_min2); \ 552 _min1 < _min2 ? _min1 : _min2; }) 553 554 #define max(x, y) ({ \ 555 typeof(x) _max1 = (x); \ 556 typeof(y) _max2 = (y); \ 557 (void) (&_max1 == &_max2); \ 558 _max1 > _max2 ? _max1 : _max2; }) 559 560 /** 561 * clamp - return a value clamped to a given range with strict typechecking 562 * @val: current value 563 * @min: minimum allowable value 564 * @max: maximum allowable value 565 * 566 * This macro does strict typechecking of min/max to make sure they are of the 567 * same type as val. See the unnecessary pointer comparisons. 568 */ 569 #define clamp(val, min, max) ({ \ 570 typeof(val) __val = (val); \ 571 typeof(min) __min = (min); \ 572 typeof(max) __max = (max); \ 573 (void) (&__val == &__min); \ 574 (void) (&__val == &__max); \ 575 __val = __val < __min ? __min: __val; \ 576 __val > __max ? __max: __val; }) 577 578 /* 579 * ..and if you can't take the strict 580 * types, you can specify one yourself. 581 * 582 * Or not use min/max/clamp at all, of course. 583 */ 584 #define min_t(type, x, y) ({ \ 585 type __min1 = (x); \ 586 type __min2 = (y); \ 587 __min1 < __min2 ? __min1: __min2; }) 588 589 #define max_t(type, x, y) ({ \ 590 type __max1 = (x); \ 591 type __max2 = (y); \ 592 __max1 > __max2 ? __max1: __max2; }) 593 594 /** 595 * clamp_t - return a value clamped to a given range using a given type 596 * @type: the type of variable to use 597 * @val: current value 598 * @min: minimum allowable value 599 * @max: maximum allowable value 600 * 601 * This macro does no typechecking and uses temporary variables of type 602 * 'type' to make all the comparisons. 603 */ 604 #define clamp_t(type, val, min, max) ({ \ 605 type __val = (val); \ 606 type __min = (min); \ 607 type __max = (max); \ 608 __val = __val < __min ? __min: __val; \ 609 __val > __max ? __max: __val; }) 610 611 /** 612 * clamp_val - return a value clamped to a given range using val's type 613 * @val: current value 614 * @min: minimum allowable value 615 * @max: maximum allowable value 616 * 617 * This macro does no typechecking and uses temporary variables of whatever 618 * type the input argument 'val' is. This is useful when val is an unsigned 619 * type and min and max are literals that will otherwise be assigned a signed 620 * integer type. 621 */ 622 #define clamp_val(val, min, max) ({ \ 623 typeof(val) __val = (val); \ 624 typeof(val) __min = (min); \ 625 typeof(val) __max = (max); \ 626 __val = __val < __min ? __min: __val; \ 627 __val > __max ? __max: __val; }) 628 629 630 /* 631 * swap - swap value of @a and @b 632 */ 633 #define swap(a, b) \ 634 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 635 636 /** 637 * container_of - cast a member of a structure out to the containing structure 638 * @ptr: the pointer to the member. 639 * @type: the type of the container struct this is embedded in. 640 * @member: the name of the member within the struct. 641 * 642 */ 643 #define container_of(ptr, type, member) ({ \ 644 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 645 (type *)( (char *)__mptr - offsetof(type,member) );}) 646 647 struct sysinfo; 648 extern int do_sysinfo(struct sysinfo *info); 649 650 #endif /* __KERNEL__ */ 651 652 #define SI_LOAD_SHIFT 16 653 struct sysinfo { 654 long uptime; /* Seconds since boot */ 655 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 656 unsigned long totalram; /* Total usable main memory size */ 657 unsigned long freeram; /* Available memory size */ 658 unsigned long sharedram; /* Amount of shared memory */ 659 unsigned long bufferram; /* Memory used by buffers */ 660 unsigned long totalswap; /* Total swap space size */ 661 unsigned long freeswap; /* swap space still available */ 662 unsigned short procs; /* Number of current processes */ 663 unsigned short pad; /* explicit padding for m68k */ 664 unsigned long totalhigh; /* Total high memory size */ 665 unsigned long freehigh; /* Available high memory size */ 666 unsigned int mem_unit; /* Memory unit size in bytes */ 667 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 668 }; 669 670 /* Force a compilation error if condition is true */ 671 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 672 673 /* Force a compilation error if condition is true, but also produce a 674 result (of value 0 and type size_t), so the expression can be used 675 e.g. in a structure initializer (or where-ever else comma expressions 676 aren't permitted). */ 677 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 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 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 690 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 691 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 692 #endif 693 694 #endif 695