/include/linux/kernel.h
C++ Header | 787 lines | 515 code | 95 blank | 177 comment | 26 complexity | 028dbb437f1e1f31a5ac91dc68d291b1 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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/dynamic_debug.h> 21#include <asm/byteorder.h> 22#include <asm/bug.h> 23 24extern const char linux_banner[]; 25extern const char linux_proc_banner[]; 26 27#define USHRT_MAX ((u16)(~0U)) 28#define SHRT_MAX ((s16)(USHRT_MAX>>1)) 29#define SHRT_MIN ((s16)(-SHRT_MAX - 1)) 30#define INT_MAX ((int)(~0U>>1)) 31#define INT_MIN (-INT_MAX - 1) 32#define UINT_MAX (~0U) 33#define LONG_MAX ((long)(~0UL>>1)) 34#define LONG_MIN (-LONG_MAX - 1) 35#define ULONG_MAX (~0UL) 36#define LLONG_MAX ((long long)(~0ULL>>1)) 37#define LLONG_MIN (-LLONG_MAX - 1) 38#define ULLONG_MAX (~0ULL) 39 40#define STACK_MAGIC 0xdeadbeef 41 42#define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) 43#define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) 44#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) 45#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) 46 47#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 48 49/* 50 * This looks more complex than it should be. But we need to 51 * get the type for the ~ right in round_down (it needs to be 52 * as wide as the result!), and we want to evaluate the macro 53 * arguments just once each. 54 */ 55#define __round_mask(x, y) ((__typeof__(x))((y)-1)) 56#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 57#define round_down(x, y) ((x) & ~__round_mask(x, y)) 58 59#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 60#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 61#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 62#define DIV_ROUND_CLOSEST(x, divisor)( \ 63{ \ 64 typeof(divisor) __divisor = divisor; \ 65 (((x) + ((__divisor) / 2)) / (__divisor)); \ 66} \ 67) 68 69#define _RET_IP_ (unsigned long)__builtin_return_address(0) 70#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 71 72#ifdef CONFIG_LBDAF 73# include <asm/div64.h> 74# define sector_div(a, b) do_div(a, b) 75#else 76# define sector_div(n, b)( \ 77{ \ 78 int _res; \ 79 _res = (n) % (b); \ 80 (n) /= (b); \ 81 _res; \ 82} \ 83) 84#endif 85 86/** 87 * upper_32_bits - return bits 32-63 of a number 88 * @n: the number we're accessing 89 * 90 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 91 * the "right shift count >= width of type" warning when that quantity is 92 * 32-bits. 93 */ 94#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 95 96/** 97 * lower_32_bits - return bits 0-31 of a number 98 * @n: the number we're accessing 99 */ 100#define lower_32_bits(n) ((u32)(n)) 101 102#define KERN_EMERG "<0>" /* system is unusable */ 103#define KERN_ALERT "<1>" /* action must be taken immediately */ 104#define KERN_CRIT "<2>" /* critical conditions */ 105#define KERN_ERR "<3>" /* error conditions */ 106#define KERN_WARNING "<4>" /* warning conditions */ 107#define KERN_NOTICE "<5>" /* normal but significant condition */ 108#define KERN_INFO "<6>" /* informational */ 109#define KERN_DEBUG "<7>" /* debug-level messages */ 110 111/* Use the default kernel loglevel */ 112#define KERN_DEFAULT "<d>" 113/* 114 * Annotation for a "continued" line of log printout (only done after a 115 * line that had no enclosing \n). Only to be used by core/arch code 116 * during early bootup (a continued line is not SMP-safe otherwise). 117 */ 118#define KERN_CONT "<c>" 119 120extern int console_printk[]; 121 122#define console_loglevel (console_printk[0]) 123#define default_message_loglevel (console_printk[1]) 124#define minimum_console_loglevel (console_printk[2]) 125#define default_console_loglevel (console_printk[3]) 126 127struct completion; 128struct pt_regs; 129struct user; 130 131#ifdef CONFIG_PREEMPT_VOLUNTARY 132extern int _cond_resched(void); 133# define might_resched() _cond_resched() 134#else 135# define might_resched() do { } while (0) 136#endif 137 138#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 139 void __might_sleep(const char *file, int line, int preempt_offset); 140/** 141 * might_sleep - annotation for functions that can sleep 142 * 143 * this macro will print a stack trace if it is executed in an atomic 144 * context (spinlock, irq-handler, ...). 145 * 146 * This is a useful debugging help to be able to catch problems early and not 147 * be bitten later when the calling function happens to sleep when it is not 148 * supposed to. 149 */ 150# define might_sleep() \ 151 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) 152#else 153 static inline void __might_sleep(const char *file, int line, 154 int preempt_offset) { } 155# define might_sleep() do { might_resched(); } while (0) 156#endif 157 158#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 159 160#define abs(x) ({ \ 161 long __x = (x); \ 162 (__x < 0) ? -__x : __x; \ 163 }) 164 165#ifdef CONFIG_PROVE_LOCKING 166void might_fault(void); 167#else 168static inline void might_fault(void) 169{ 170 might_sleep(); 171} 172#endif 173 174extern struct atomic_notifier_head panic_notifier_list; 175extern long (*panic_blink)(long time); 176NORET_TYPE void panic(const char * fmt, ...) 177 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 178extern void oops_enter(void); 179extern void oops_exit(void); 180extern int oops_may_print(void); 181NORET_TYPE void do_exit(long error_code) 182 ATTRIB_NORET; 183NORET_TYPE void complete_and_exit(struct completion *, long) 184 ATTRIB_NORET; 185extern unsigned long simple_strtoul(const char *,char **,unsigned int); 186extern long simple_strtol(const char *,char **,unsigned int); 187extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 188extern long long simple_strtoll(const char *,char **,unsigned int); 189extern int strict_strtoul(const char *, unsigned int, unsigned long *); 190extern int strict_strtol(const char *, unsigned int, long *); 191extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 192extern int strict_strtoll(const char *, unsigned int, long long *); 193extern int sprintf(char * buf, const char * fmt, ...) 194 __attribute__ ((format (printf, 2, 3))); 195extern int vsprintf(char *buf, const char *, va_list) 196 __attribute__ ((format (printf, 2, 0))); 197extern int snprintf(char * buf, size_t size, const char * fmt, ...) 198 __attribute__ ((format (printf, 3, 4))); 199extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 200 __attribute__ ((format (printf, 3, 0))); 201extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 202 __attribute__ ((format (printf, 3, 4))); 203extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 204 __attribute__ ((format (printf, 3, 0))); 205extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 206 __attribute__ ((format (printf, 2, 3))); 207extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 208 209extern int sscanf(const char *, const char *, ...) 210 __attribute__ ((format (scanf, 2, 3))); 211extern int vsscanf(const char *, const char *, va_list) 212 __attribute__ ((format (scanf, 2, 0))); 213 214extern int get_option(char **str, int *pint); 215extern char *get_options(const char *str, int nints, int *ints); 216extern unsigned long long memparse(const char *ptr, char **retptr); 217 218extern int core_kernel_text(unsigned long addr); 219extern int __kernel_text_address(unsigned long addr); 220extern int kernel_text_address(unsigned long addr); 221extern int func_ptr_is_kernel_text(void *ptr); 222 223struct pid; 224extern struct pid *session_of_pgrp(struct pid *pgrp); 225 226/* 227 * FW_BUG 228 * Add this to a message where you are sure the firmware is buggy or behaves 229 * really stupid or out of spec. Be aware that the responsible BIOS developer 230 * should be able to fix this issue or at least get a concrete idea of the 231 * problem by reading your message without the need of looking at the kernel 232 * code. 233 * 234 * Use it for definite and high priority BIOS bugs. 235 * 236 * FW_WARN 237 * Use it for not that clear (e.g. could the kernel messed up things already?) 238 * and medium priority BIOS bugs. 239 * 240 * FW_INFO 241 * Use this one if you want to tell the user or vendor about something 242 * suspicious, but generally harmless related to the firmware. 243 * 244 * Use it for information or very low priority BIOS bugs. 245 */ 246#define FW_BUG "[Firmware Bug]: " 247#define FW_WARN "[Firmware Warn]: " 248#define FW_INFO "[Firmware Info]: " 249 250#ifdef CONFIG_PRINTK 251asmlinkage int vprintk(const char *fmt, va_list args) 252 __attribute__ ((format (printf, 1, 0))); 253asmlinkage int printk(const char * fmt, ...) 254 __attribute__ ((format (printf, 1, 2))) __cold; 255 256extern int __printk_ratelimit(const char *func); 257#define printk_ratelimit() __printk_ratelimit(__func__) 258extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 259 unsigned int interval_msec); 260 261extern int printk_delay_msec; 262 263/* 264 * Print a one-time message (analogous to WARN_ONCE() et al): 265 */ 266#define printk_once(x...) ({ \ 267 static bool __print_once; \ 268 \ 269 if (!__print_once) { \ 270 __print_once = true; \ 271 printk(x); \ 272 } \ 273}) 274 275void log_buf_kexec_setup(void); 276#else 277static inline int vprintk(const char *s, va_list args) 278 __attribute__ ((format (printf, 1, 0))); 279static inline int vprintk(const char *s, va_list args) { return 0; } 280static inline int printk(const char *s, ...) 281 __attribute__ ((format (printf, 1, 2))); 282static inline int __cold printk(const char *s, ...) { return 0; } 283static inline int printk_ratelimit(void) { return 0; } 284static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 285 unsigned int interval_msec) \ 286 { return false; } 287 288/* No effect, but we still get type checking even in the !PRINTK case: */ 289#define printk_once(x...) printk(x) 290 291static inline void log_buf_kexec_setup(void) 292{ 293} 294#endif 295 296extern int printk_needs_cpu(int cpu); 297extern void printk_tick(void); 298 299extern void asmlinkage __attribute__((format(printf, 1, 2))) 300 early_printk(const char *fmt, ...); 301 302unsigned long int_sqrt(unsigned long); 303 304static inline void console_silent(void) 305{ 306 console_loglevel = 0; 307} 308 309static inline void console_verbose(void) 310{ 311 if (console_loglevel) 312 console_loglevel = 15; 313} 314 315extern void bust_spinlocks(int yes); 316extern void wake_up_klogd(void); 317extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 318extern int panic_timeout; 319extern int panic_on_oops; 320extern int panic_on_unrecovered_nmi; 321extern int panic_on_io_nmi; 322extern const char *print_tainted(void); 323extern void add_taint(unsigned flag); 324extern int test_taint(unsigned flag); 325extern unsigned long get_taint(void); 326extern int root_mountflags; 327 328/* Values used for system_state */ 329extern enum system_states { 330 SYSTEM_BOOTING, 331 SYSTEM_RUNNING, 332 SYSTEM_HALT, 333 SYSTEM_POWER_OFF, 334 SYSTEM_RESTART, 335 SYSTEM_SUSPEND_DISK, 336} system_state; 337 338#define TAINT_PROPRIETARY_MODULE 0 339#define TAINT_FORCED_MODULE 1 340#define TAINT_UNSAFE_SMP 2 341#define TAINT_FORCED_RMMOD 3 342#define TAINT_MACHINE_CHECK 4 343#define TAINT_BAD_PAGE 5 344#define TAINT_USER 6 345#define TAINT_DIE 7 346#define TAINT_OVERRIDDEN_ACPI_TABLE 8 347#define TAINT_WARN 9 348#define TAINT_CRAP 10 349#define TAINT_FIRMWARE_WORKAROUND 11 350 351extern void dump_stack(void) __cold; 352 353enum { 354 DUMP_PREFIX_NONE, 355 DUMP_PREFIX_ADDRESS, 356 DUMP_PREFIX_OFFSET 357}; 358extern void hex_dump_to_buffer(const void *buf, size_t len, 359 int rowsize, int groupsize, 360 char *linebuf, size_t linebuflen, bool ascii); 361extern void print_hex_dump(const char *level, const char *prefix_str, 362 int prefix_type, int rowsize, int groupsize, 363 const void *buf, size_t len, bool ascii); 364extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 365 const void *buf, size_t len); 366 367extern const char hex_asc[]; 368#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 369#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 370 371static inline char *pack_hex_byte(char *buf, u8 byte) 372{ 373 *buf++ = hex_asc_hi(byte); 374 *buf++ = hex_asc_lo(byte); 375 return buf; 376} 377 378extern int hex_to_bin(char ch); 379 380#ifndef pr_fmt 381#define pr_fmt(fmt) fmt 382#endif 383 384#define pr_emerg(fmt, ...) \ 385 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 386#define pr_alert(fmt, ...) \ 387 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 388#define pr_crit(fmt, ...) \ 389 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 390#define pr_err(fmt, ...) \ 391 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 392#define pr_warning(fmt, ...) \ 393 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 394#define pr_warn pr_warning 395#define pr_notice(fmt, ...) \ 396 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 397#define pr_info(fmt, ...) \ 398 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 399#define pr_cont(fmt, ...) \ 400 printk(KERN_CONT fmt, ##__VA_ARGS__) 401 402/* pr_devel() should produce zero code unless DEBUG is defined */ 403#ifdef DEBUG 404#define pr_devel(fmt, ...) \ 405 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 406#else 407#define pr_devel(fmt, ...) \ 408 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 409#endif 410 411/* If you are writing a driver, please use dev_dbg instead */ 412#if defined(DEBUG) 413#define pr_debug(fmt, ...) \ 414 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 415#elif defined(CONFIG_DYNAMIC_DEBUG) 416/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 417#define pr_debug(fmt, ...) \ 418 dynamic_pr_debug(fmt, ##__VA_ARGS__) 419#else 420#define pr_debug(fmt, ...) \ 421 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 422#endif 423 424/* 425 * ratelimited messages with local ratelimit_state, 426 * no local ratelimit_state used in the !PRINTK case 427 */ 428#ifdef CONFIG_PRINTK 429#define printk_ratelimited(fmt, ...) ({ \ 430 static DEFINE_RATELIMIT_STATE(_rs, \ 431 DEFAULT_RATELIMIT_INTERVAL, \ 432 DEFAULT_RATELIMIT_BURST); \ 433 \ 434 if (__ratelimit(&_rs)) \ 435 printk(fmt, ##__VA_ARGS__); \ 436}) 437#else 438/* No effect, but we still get type checking even in the !PRINTK case: */ 439#define printk_ratelimited printk 440#endif 441 442#define pr_emerg_ratelimited(fmt, ...) \ 443 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 444#define pr_alert_ratelimited(fmt, ...) \ 445 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 446#define pr_crit_ratelimited(fmt, ...) \ 447 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 448#define pr_err_ratelimited(fmt, ...) \ 449 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 450#define pr_warning_ratelimited(fmt, ...) \ 451 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 452#define pr_warn_ratelimited pr_warning_ratelimited 453#define pr_notice_ratelimited(fmt, ...) \ 454 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 455#define pr_info_ratelimited(fmt, ...) \ 456 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 457/* no pr_cont_ratelimited, don't do that... */ 458/* If you are writing a driver, please use dev_dbg instead */ 459#if defined(DEBUG) 460#define pr_debug_ratelimited(fmt, ...) \ 461 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 462#else 463#define pr_debug_ratelimited(fmt, ...) \ 464 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ 465 ##__VA_ARGS__); 0; }) 466#endif 467 468/* 469 * General tracing related utility functions - trace_printk(), 470 * tracing_on/tracing_off and tracing_start()/tracing_stop 471 * 472 * Use tracing_on/tracing_off when you want to quickly turn on or off 473 * tracing. It simply enables or disables the recording of the trace events. 474 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 475 * file, which gives a means for the kernel and userspace to interact. 476 * Place a tracing_off() in the kernel where you want tracing to end. 477 * From user space, examine the trace, and then echo 1 > tracing_on 478 * to continue tracing. 479 * 480 * tracing_stop/tracing_start has slightly more overhead. It is used 481 * by things like suspend to ram where disabling the recording of the 482 * trace is not enough, but tracing must actually stop because things 483 * like calling smp_processor_id() may crash the system. 484 * 485 * Most likely, you want to use tracing_on/tracing_off. 486 */ 487#ifdef CONFIG_RING_BUFFER 488void tracing_on(void); 489void tracing_off(void); 490/* trace_off_permanent stops recording with no way to bring it back */ 491void tracing_off_permanent(void); 492int tracing_is_on(void); 493#else 494static inline void tracing_on(void) { } 495static inline void tracing_off(void) { } 496static inline void tracing_off_permanent(void) { } 497static inline int tracing_is_on(void) { return 0; } 498#endif 499 500enum ftrace_dump_mode { 501 DUMP_NONE, 502 DUMP_ALL, 503 DUMP_ORIG, 504}; 505 506#ifdef CONFIG_TRACING 507extern void tracing_start(void); 508extern void tracing_stop(void); 509extern void ftrace_off_permanent(void); 510 511extern void 512ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); 513 514static inline void __attribute__ ((format (printf, 1, 2))) 515____trace_printk_check_format(const char *fmt, ...) 516{ 517} 518#define __trace_printk_check_format(fmt, args...) \ 519do { \ 520 if (0) \ 521 ____trace_printk_check_format(fmt, ##args); \ 522} while (0) 523 524/** 525 * trace_printk - printf formatting in the ftrace buffer 526 * @fmt: the printf format for printing 527 * 528 * Note: __trace_printk is an internal function for trace_printk and 529 * the @ip is passed in via the trace_printk macro. 530 * 531 * This function allows a kernel developer to debug fast path sections 532 * that printk is not appropriate for. By scattering in various 533 * printk like tracing in the code, a developer can quickly see 534 * where problems are occurring. 535 * 536 * This is intended as a debugging tool for the developer only. 537 * Please refrain from leaving trace_printks scattered around in 538 * your code. 539 */ 540 541#define trace_printk(fmt, args...) \ 542do { \ 543 __trace_printk_check_format(fmt, ##args); \ 544 if (__builtin_constant_p(fmt)) { \ 545 static const char *trace_printk_fmt \ 546 __attribute__((section("__trace_printk_fmt"))) = \ 547 __builtin_constant_p(fmt) ? fmt : NULL; \ 548 \ 549 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 550 } else \ 551 __trace_printk(_THIS_IP_, fmt, ##args); \ 552} while (0) 553 554extern int 555__trace_bprintk(unsigned long ip, const char *fmt, ...) 556 __attribute__ ((format (printf, 2, 3))); 557 558extern int 559__trace_printk(unsigned long ip, const char *fmt, ...) 560 __attribute__ ((format (printf, 2, 3))); 561 562extern void trace_dump_stack(void); 563 564/* 565 * The double __builtin_constant_p is because gcc will give us an error 566 * if we try to allocate the static variable to fmt if it is not a 567 * constant. Even with the outer if statement. 568 */ 569#define ftrace_vprintk(fmt, vargs) \ 570do { \ 571 if (__builtin_constant_p(fmt)) { \ 572 static const char *trace_printk_fmt \ 573 __attribute__((section("__trace_printk_fmt"))) = \ 574 __builtin_constant_p(fmt) ? fmt : NULL; \ 575 \ 576 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 577 } else \ 578 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 579} while (0) 580 581extern int 582__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 583 584extern int 585__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 586 587extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 588#else 589static inline void 590ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } 591static inline int 592trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 593 594static inline void tracing_start(void) { } 595static inline void tracing_stop(void) { } 596static inline void ftrace_off_permanent(void) { } 597static inline void trace_dump_stack(void) { } 598static inline int 599trace_printk(const char *fmt, ...) 600{ 601 return 0; 602} 603static inline int 604ftrace_vprintk(const char *fmt, va_list ap) 605{ 606 return 0; 607} 608static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 609#endif /* CONFIG_TRACING */ 610 611/* 612 * Display an IP address in readable format. 613 */ 614 615#define NIPQUAD(addr) \ 616 ((unsigned char *)&addr)[0], \ 617 ((unsigned char *)&addr)[1], \ 618 ((unsigned char *)&addr)[2], \ 619 ((unsigned char *)&addr)[3] 620#define NIPQUAD_FMT "%u.%u.%u.%u" 621 622/* 623 * min()/max()/clamp() macros that also do 624 * strict type-checking.. See the 625 * "unnecessary" pointer comparison. 626 */ 627#define min(x, y) ({ \ 628 typeof(x) _min1 = (x); \ 629 typeof(y) _min2 = (y); \ 630 (void) (&_min1 == &_min2); \ 631 _min1 < _min2 ? _min1 : _min2; }) 632 633#define max(x, y) ({ \ 634 typeof(x) _max1 = (x); \ 635 typeof(y) _max2 = (y); \ 636 (void) (&_max1 == &_max2); \ 637 _max1 > _max2 ? _max1 : _max2; }) 638 639/** 640 * clamp - return a value clamped to a given range with strict typechecking 641 * @val: current value 642 * @min: minimum allowable value 643 * @max: maximum allowable value 644 * 645 * This macro does strict typechecking of min/max to make sure they are of the 646 * same type as val. See the unnecessary pointer comparisons. 647 */ 648#define clamp(val, min, max) ({ \ 649 typeof(val) __val = (val); \ 650 typeof(min) __min = (min); \ 651 typeof(max) __max = (max); \ 652 (void) (&__val == &__min); \ 653 (void) (&__val == &__max); \ 654 __val = __val < __min ? __min: __val; \ 655 __val > __max ? __max: __val; }) 656 657/* 658 * ..and if you can't take the strict 659 * types, you can specify one yourself. 660 * 661 * Or not use min/max/clamp at all, of course. 662 */ 663#define min_t(type, x, y) ({ \ 664 type __min1 = (x); \ 665 type __min2 = (y); \ 666 __min1 < __min2 ? __min1: __min2; }) 667 668#define max_t(type, x, y) ({ \ 669 type __max1 = (x); \ 670 type __max2 = (y); \ 671 __max1 > __max2 ? __max1: __max2; }) 672 673/** 674 * clamp_t - return a value clamped to a given range using a given type 675 * @type: the type of variable to use 676 * @val: current value 677 * @min: minimum allowable value 678 * @max: maximum allowable value 679 * 680 * This macro does no typechecking and uses temporary variables of type 681 * 'type' to make all the comparisons. 682 */ 683#define clamp_t(type, val, min, max) ({ \ 684 type __val = (val); \ 685 type __min = (min); \ 686 type __max = (max); \ 687 __val = __val < __min ? __min: __val; \ 688 __val > __max ? __max: __val; }) 689 690/** 691 * clamp_val - return a value clamped to a given range using val's type 692 * @val: current value 693 * @min: minimum allowable value 694 * @max: maximum allowable value 695 * 696 * This macro does no typechecking and uses temporary variables of whatever 697 * type the input argument 'val' is. This is useful when val is an unsigned 698 * type and min and max are literals that will otherwise be assigned a signed 699 * integer type. 700 */ 701#define clamp_val(val, min, max) ({ \ 702 typeof(val) __val = (val); \ 703 typeof(val) __min = (min); \ 704 typeof(val) __max = (max); \ 705 __val = __val < __min ? __min: __val; \ 706 __val > __max ? __max: __val; }) 707 708 709/* 710 * swap - swap value of @a and @b 711 */ 712#define swap(a, b) \ 713 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 714 715/** 716 * container_of - cast a member of a structure out to the containing structure 717 * @ptr: the pointer to the member. 718 * @type: the type of the container struct this is embedded in. 719 * @member: the name of the member within the struct. 720 * 721 */ 722#define container_of(ptr, type, member) ({ \ 723 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 724 (type *)( (char *)__mptr - offsetof(type,member) );}) 725 726struct sysinfo; 727extern int do_sysinfo(struct sysinfo *info); 728 729#endif /* __KERNEL__ */ 730 731#ifndef __EXPORTED_HEADERS__ 732#ifndef __KERNEL__ 733#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders 734#endif /* __KERNEL__ */ 735#endif /* __EXPORTED_HEADERS__ */ 736 737#define SI_LOAD_SHIFT 16 738struct sysinfo { 739 long uptime; /* Seconds since boot */ 740 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 741 unsigned long totalram; /* Total usable main memory size */ 742 unsigned long freeram; /* Available memory size */ 743 unsigned long sharedram; /* Amount of shared memory */ 744 unsigned long bufferram; /* Memory used by buffers */ 745 unsigned long totalswap; /* Total swap space size */ 746 unsigned long freeswap; /* swap space still available */ 747 unsigned short procs; /* Number of current processes */ 748 unsigned short pad; /* explicit padding for m68k */ 749 unsigned long totalhigh; /* Total high memory size */ 750 unsigned long freehigh; /* Available high memory size */ 751 unsigned int mem_unit; /* Memory unit size in bytes */ 752 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 753}; 754 755/* Force a compilation error if condition is true */ 756#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 757 758/* Force a compilation error if condition is constant and true */ 759#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 760 761/* Force a compilation error if a constant expression is not a power of 2 */ 762#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 763 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 764 765/* Force a compilation error if condition is true, but also produce a 766 result (of value 0 and type size_t), so the expression can be used 767 e.g. in a structure initializer (or where-ever else comma expressions 768 aren't permitted). */ 769#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 770#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 771 772/* Trap pasters of __FUNCTION__ at compile-time */ 773#define __FUNCTION__ (__func__) 774 775/* This helps us to avoid #ifdef CONFIG_NUMA */ 776#ifdef CONFIG_NUMA 777#define NUMA_BUILD 1 778#else 779#define NUMA_BUILD 0 780#endif 781 782/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 783#ifdef CONFIG_FTRACE_MCOUNT_RECORD 784# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 785#endif 786 787#endif