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 174struct va_format { 175 const char *fmt; 176 va_list *va; 177}; 178 179extern struct atomic_notifier_head panic_notifier_list; 180extern long (*panic_blink)(int state); 181NORET_TYPE void panic(const char * fmt, ...) 182 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 183extern void oops_enter(void); 184extern void oops_exit(void); 185void print_oops_end_marker(void); 186extern int oops_may_print(void); 187NORET_TYPE void do_exit(long error_code) 188 ATTRIB_NORET; 189NORET_TYPE void complete_and_exit(struct completion *, long) 190 ATTRIB_NORET; 191extern unsigned long simple_strtoul(const char *,char **,unsigned int); 192extern long simple_strtol(const char *,char **,unsigned int); 193extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 194extern long long simple_strtoll(const char *,char **,unsigned int); 195extern int strict_strtoul(const char *, unsigned int, unsigned long *); 196extern int strict_strtol(const char *, unsigned int, long *); 197extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 198extern int strict_strtoll(const char *, unsigned int, long long *); 199extern int sprintf(char * buf, const char * fmt, ...) 200 __attribute__ ((format (printf, 2, 3))); 201extern int vsprintf(char *buf, const char *, va_list) 202 __attribute__ ((format (printf, 2, 0))); 203extern int snprintf(char * buf, size_t size, const char * fmt, ...) 204 __attribute__ ((format (printf, 3, 4))); 205extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 206 __attribute__ ((format (printf, 3, 0))); 207extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 208 __attribute__ ((format (printf, 3, 4))); 209extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 210 __attribute__ ((format (printf, 3, 0))); 211extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 212 __attribute__ ((format (printf, 2, 3))); 213extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 214 215extern int sscanf(const char *, const char *, ...) 216 __attribute__ ((format (scanf, 2, 3))); 217extern int vsscanf(const char *, const char *, va_list) 218 __attribute__ ((format (scanf, 2, 0))); 219 220extern int get_option(char **str, int *pint); 221extern char *get_options(const char *str, int nints, int *ints); 222extern unsigned long long memparse(const char *ptr, char **retptr); 223 224extern int core_kernel_text(unsigned long addr); 225extern int __kernel_text_address(unsigned long addr); 226extern int kernel_text_address(unsigned long addr); 227extern int func_ptr_is_kernel_text(void *ptr); 228 229struct pid; 230extern struct pid *session_of_pgrp(struct pid *pgrp); 231 232/* 233 * FW_BUG 234 * Add this to a message where you are sure the firmware is buggy or behaves 235 * really stupid or out of spec. Be aware that the responsible BIOS developer 236 * should be able to fix this issue or at least get a concrete idea of the 237 * problem by reading your message without the need of looking at the kernel 238 * code. 239 * 240 * Use it for definite and high priority BIOS bugs. 241 * 242 * FW_WARN 243 * Use it for not that clear (e.g. could the kernel messed up things already?) 244 * and medium priority BIOS bugs. 245 * 246 * FW_INFO 247 * Use this one if you want to tell the user or vendor about something 248 * suspicious, but generally harmless related to the firmware. 249 * 250 * Use it for information or very low priority BIOS bugs. 251 */ 252#define FW_BUG "[Firmware Bug]: " 253#define FW_WARN "[Firmware Warn]: " 254#define FW_INFO "[Firmware Info]: " 255 256/* 257 * HW_ERR 258 * Add this to a message for hardware errors, so that user can report 259 * it to hardware vendor instead of LKML or software vendor. 260 */ 261#define HW_ERR "[Hardware Error]: " 262 263#ifdef CONFIG_PRINTK 264asmlinkage int vprintk(const char *fmt, va_list args) 265 __attribute__ ((format (printf, 1, 0))); 266asmlinkage int printk(const char * fmt, ...) 267 __attribute__ ((format (printf, 1, 2))) __cold; 268 269extern int __printk_ratelimit(const char *func); 270#define printk_ratelimit() __printk_ratelimit(__func__) 271extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 272 unsigned int interval_msec); 273 274extern int printk_delay_msec; 275#ifdef CONFIG_DUMP_PREV_OOPS_MSG 276extern void enable_oopsbuf(int onoff); 277extern int prepare_and_dump_previous_oops(void); 278#endif 279 280/* 281 * Print a one-time message (analogous to WARN_ONCE() et al): 282 */ 283#define printk_once(x...) ({ \ 284 static bool __print_once; \ 285 \ 286 if (!__print_once) { \ 287 __print_once = true; \ 288 printk(x); \ 289 } \ 290}) 291 292void log_buf_kexec_setup(void); 293#else 294static inline int vprintk(const char *s, va_list args) 295 __attribute__ ((format (printf, 1, 0))); 296static inline int vprintk(const char *s, va_list args) { return 0; } 297static inline int printk(const char *s, ...) 298 __attribute__ ((format (printf, 1, 2))); 299static inline int __cold printk(const char *s, ...) { return 0; } 300static inline int printk_ratelimit(void) { return 0; } 301static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 302 unsigned int interval_msec) \ 303 { return false; } 304 305/* No effect, but we still get type checking even in the !PRINTK case: */ 306#define printk_once(x...) printk(x) 307 308static inline void log_buf_kexec_setup(void) 309{ 310} 311#endif 312 313/* 314 * Dummy printk for disabled debugging statements to use whilst maintaining 315 * gcc's format and side-effect checking. 316 */ 317static inline __attribute__ ((format (printf, 1, 2))) 318int no_printk(const char *s, ...) { return 0; } 319 320extern int printk_needs_cpu(int cpu); 321extern void printk_tick(void); 322 323extern void asmlinkage __attribute__((format(printf, 1, 2))) 324 early_printk(const char *fmt, ...); 325 326unsigned long int_sqrt(unsigned long); 327 328static inline void console_silent(void) 329{ 330 console_loglevel = 0; 331} 332 333static inline void console_verbose(void) 334{ 335 if (console_loglevel) 336 console_loglevel = 15; 337} 338 339extern void bust_spinlocks(int yes); 340extern void wake_up_klogd(void); 341extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 342extern int panic_timeout; 343extern int panic_on_oops; 344extern int panic_on_unrecovered_nmi; 345extern int panic_on_io_nmi; 346extern const char *print_tainted(void); 347extern void add_taint(unsigned flag); 348extern int test_taint(unsigned flag); 349extern unsigned long get_taint(void); 350extern int root_mountflags; 351 352/* Values used for system_state */ 353extern enum system_states { 354 SYSTEM_BOOTING, 355 SYSTEM_RUNNING, 356 SYSTEM_HALT, 357 SYSTEM_POWER_OFF, 358 SYSTEM_RESTART, 359 SYSTEM_SUSPEND_DISK, 360} system_state; 361 362#define TAINT_PROPRIETARY_MODULE 0 363#define TAINT_FORCED_MODULE 1 364#define TAINT_UNSAFE_SMP 2 365#define TAINT_FORCED_RMMOD 3 366#define TAINT_MACHINE_CHECK 4 367#define TAINT_BAD_PAGE 5 368#define TAINT_USER 6 369#define TAINT_DIE 7 370#define TAINT_OVERRIDDEN_ACPI_TABLE 8 371#define TAINT_WARN 9 372#define TAINT_CRAP 10 373#define TAINT_FIRMWARE_WORKAROUND 11 374 375extern void dump_stack(void) __cold; 376 377enum { 378 DUMP_PREFIX_NONE, 379 DUMP_PREFIX_ADDRESS, 380 DUMP_PREFIX_OFFSET 381}; 382extern void hex_dump_to_buffer(const void *buf, size_t len, 383 int rowsize, int groupsize, 384 char *linebuf, size_t linebuflen, bool ascii); 385extern void print_hex_dump(const char *level, const char *prefix_str, 386 int prefix_type, int rowsize, int groupsize, 387 const void *buf, size_t len, bool ascii); 388extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 389 const void *buf, size_t len); 390 391extern const char hex_asc[]; 392#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 393#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 394 395static inline char *pack_hex_byte(char *buf, u8 byte) 396{ 397 *buf++ = hex_asc_hi(byte); 398 *buf++ = hex_asc_lo(byte); 399 return buf; 400} 401 402extern int hex_to_bin(char ch); 403 404#ifndef pr_fmt 405#define pr_fmt(fmt) fmt 406#endif 407 408#define pr_emerg(fmt, ...) \ 409 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 410#define pr_alert(fmt, ...) \ 411 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 412#define pr_crit(fmt, ...) \ 413 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 414#define pr_err(fmt, ...) \ 415 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 416#define pr_warning(fmt, ...) \ 417 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 418#define pr_warn pr_warning 419#define pr_notice(fmt, ...) \ 420 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 421#define pr_info(fmt, ...) \ 422 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 423#define pr_cont(fmt, ...) \ 424 printk(KERN_CONT fmt, ##__VA_ARGS__) 425 426/* pr_devel() should produce zero code unless DEBUG is defined */ 427#ifdef DEBUG 428#define pr_devel(fmt, ...) \ 429 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 430#else 431#define pr_devel(fmt, ...) \ 432 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 433#endif 434 435/* If you are writing a driver, please use dev_dbg instead */ 436#if defined(DEBUG) 437#define pr_debug(fmt, ...) \ 438 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 439#elif defined(CONFIG_DYNAMIC_DEBUG) 440/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 441#define pr_debug(fmt, ...) \ 442 dynamic_pr_debug(fmt, ##__VA_ARGS__) 443#else 444#define pr_debug(fmt, ...) \ 445 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 446#endif 447 448/* 449 * ratelimited messages with local ratelimit_state, 450 * no local ratelimit_state used in the !PRINTK case 451 */ 452#ifdef CONFIG_PRINTK 453#define printk_ratelimited(fmt, ...) ({ \ 454 static DEFINE_RATELIMIT_STATE(_rs, \ 455 DEFAULT_RATELIMIT_INTERVAL, \ 456 DEFAULT_RATELIMIT_BURST); \ 457 \ 458 if (__ratelimit(&_rs)) \ 459 printk(fmt, ##__VA_ARGS__); \ 460}) 461#else 462/* No effect, but we still get type checking even in the !PRINTK case: */ 463#define printk_ratelimited printk 464#endif 465 466#define pr_emerg_ratelimited(fmt, ...) \ 467 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 468#define pr_alert_ratelimited(fmt, ...) \ 469 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 470#define pr_crit_ratelimited(fmt, ...) \ 471 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 472#define pr_err_ratelimited(fmt, ...) \ 473 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 474#define pr_warning_ratelimited(fmt, ...) \ 475 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 476#define pr_warn_ratelimited pr_warning_ratelimited 477#define pr_notice_ratelimited(fmt, ...) \ 478 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 479#define pr_info_ratelimited(fmt, ...) \ 480 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 481/* no pr_cont_ratelimited, don't do that... */ 482/* If you are writing a driver, please use dev_dbg instead */ 483#if defined(DEBUG) 484#define pr_debug_ratelimited(fmt, ...) \ 485 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 486#else 487#define pr_debug_ratelimited(fmt, ...) \ 488 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ 489 ##__VA_ARGS__); 0; }) 490#endif 491 492/* 493 * General tracing related utility functions - trace_printk(), 494 * tracing_on/tracing_off and tracing_start()/tracing_stop 495 * 496 * Use tracing_on/tracing_off when you want to quickly turn on or off 497 * tracing. It simply enables or disables the recording of the trace events. 498 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 499 * file, which gives a means for the kernel and userspace to interact. 500 * Place a tracing_off() in the kernel where you want tracing to end. 501 * From user space, examine the trace, and then echo 1 > tracing_on 502 * to continue tracing. 503 * 504 * tracing_stop/tracing_start has slightly more overhead. It is used 505 * by things like suspend to ram where disabling the recording of the 506 * trace is not enough, but tracing must actually stop because things 507 * like calling smp_processor_id() may crash the system. 508 * 509 * Most likely, you want to use tracing_on/tracing_off. 510 */ 511#ifdef CONFIG_RING_BUFFER 512void tracing_on(void); 513void tracing_off(void); 514/* trace_off_permanent stops recording with no way to bring it back */ 515void tracing_off_permanent(void); 516int tracing_is_on(void); 517#else 518static inline void tracing_on(void) { } 519static inline void tracing_off(void) { } 520static inline void tracing_off_permanent(void) { } 521static inline int tracing_is_on(void) { return 0; } 522#endif 523 524enum ftrace_dump_mode { 525 DUMP_NONE, 526 DUMP_ALL, 527 DUMP_ORIG, 528}; 529 530#ifdef CONFIG_TRACING 531extern void tracing_start(void); 532extern void tracing_stop(void); 533extern void ftrace_off_permanent(void); 534 535static inline void __attribute__ ((format (printf, 1, 2))) 536____trace_printk_check_format(const char *fmt, ...) 537{ 538} 539#define __trace_printk_check_format(fmt, args...) \ 540do { \ 541 if (0) \ 542 ____trace_printk_check_format(fmt, ##args); \ 543} while (0) 544 545/** 546 * trace_printk - printf formatting in the ftrace buffer 547 * @fmt: the printf format for printing 548 * 549 * Note: __trace_printk is an internal function for trace_printk and 550 * the @ip is passed in via the trace_printk macro. 551 * 552 * This function allows a kernel developer to debug fast path sections 553 * that printk is not appropriate for. By scattering in various 554 * printk like tracing in the code, a developer can quickly see 555 * where problems are occurring. 556 * 557 * This is intended as a debugging tool for the developer only. 558 * Please refrain from leaving trace_printks scattered around in 559 * your code. 560 */ 561 562#define trace_printk(fmt, args...) \ 563do { \ 564 __trace_printk_check_format(fmt, ##args); \ 565 if (__builtin_constant_p(fmt)) { \ 566 static const char *trace_printk_fmt \ 567 __attribute__((section("__trace_printk_fmt"))) = \ 568 __builtin_constant_p(fmt) ? fmt : NULL; \ 569 \ 570 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 571 } else \ 572 __trace_printk(_THIS_IP_, fmt, ##args); \ 573} while (0) 574 575extern int 576__trace_bprintk(unsigned long ip, const char *fmt, ...) 577 __attribute__ ((format (printf, 2, 3))); 578 579extern int 580__trace_printk(unsigned long ip, const char *fmt, ...) 581 __attribute__ ((format (printf, 2, 3))); 582 583extern void trace_dump_stack(void); 584 585/* 586 * The double __builtin_constant_p is because gcc will give us an error 587 * if we try to allocate the static variable to fmt if it is not a 588 * constant. Even with the outer if statement. 589 */ 590#define ftrace_vprintk(fmt, vargs) \ 591do { \ 592 if (__builtin_constant_p(fmt)) { \ 593 static const char *trace_printk_fmt \ 594 __attribute__((section("__trace_printk_fmt"))) = \ 595 __builtin_constant_p(fmt) ? fmt : NULL; \ 596 \ 597 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 598 } else \ 599 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 600} while (0) 601 602extern int 603__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 604 605extern int 606__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 607 608extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 609#else 610static inline int 611trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 612 613static inline void tracing_start(void) { } 614static inline void tracing_stop(void) { } 615static inline void ftrace_off_permanent(void) { } 616static inline void trace_dump_stack(void) { } 617static inline int 618trace_printk(const char *fmt, ...) 619{ 620 return 0; 621} 622static inline int 623ftrace_vprintk(const char *fmt, va_list ap) 624{ 625 return 0; 626} 627static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 628#endif /* CONFIG_TRACING */ 629 630/* 631 * min()/max()/clamp() macros that also do 632 * strict type-checking.. See the 633 * "unnecessary" pointer comparison. 634 */ 635#define min(x, y) ({ \ 636 typeof(x) _min1 = (x); \ 637 typeof(y) _min2 = (y); \ 638 (void) (&_min1 == &_min2); \ 639 _min1 < _min2 ? _min1 : _min2; }) 640 641#define max(x, y) ({ \ 642 typeof(x) _max1 = (x); \ 643 typeof(y) _max2 = (y); \ 644 (void) (&_max1 == &_max2); \ 645 _max1 > _max2 ? _max1 : _max2; }) 646 647/** 648 * clamp - return a value clamped to a given range with strict typechecking 649 * @val: current value 650 * @min: minimum allowable value 651 * @max: maximum allowable value 652 * 653 * This macro does strict typechecking of min/max to make sure they are of the 654 * same type as val. See the unnecessary pointer comparisons. 655 */ 656#define clamp(val, min, max) ({ \ 657 typeof(val) __val = (val); \ 658 typeof(min) __min = (min); \ 659 typeof(max) __max = (max); \ 660 (void) (&__val == &__min); \ 661 (void) (&__val == &__max); \ 662 __val = __val < __min ? __min: __val; \ 663 __val > __max ? __max: __val; }) 664 665/* 666 * ..and if you can't take the strict 667 * types, you can specify one yourself. 668 * 669 * Or not use min/max/clamp at all, of course. 670 */ 671#define min_t(type, x, y) ({ \ 672 type __min1 = (x); \ 673 type __min2 = (y); \ 674 __min1 < __min2 ? __min1: __min2; }) 675 676#define max_t(type, x, y) ({ \ 677 type __max1 = (x); \ 678 type __max2 = (y); \ 679 __max1 > __max2 ? __max1: __max2; }) 680 681/** 682 * clamp_t - return a value clamped to a given range using a given type 683 * @type: the type of variable to use 684 * @val: current value 685 * @min: minimum allowable value 686 * @max: maximum allowable value 687 * 688 * This macro does no typechecking and uses temporary variables of type 689 * 'type' to make all the comparisons. 690 */ 691#define clamp_t(type, val, min, max) ({ \ 692 type __val = (val); \ 693 type __min = (min); \ 694 type __max = (max); \ 695 __val = __val < __min ? __min: __val; \ 696 __val > __max ? __max: __val; }) 697 698/** 699 * clamp_val - return a value clamped to a given range using val's type 700 * @val: current value 701 * @min: minimum allowable value 702 * @max: maximum allowable value 703 * 704 * This macro does no typechecking and uses temporary variables of whatever 705 * type the input argument 'val' is. This is useful when val is an unsigned 706 * type and min and max are literals that will otherwise be assigned a signed 707 * integer type. 708 */ 709#define clamp_val(val, min, max) ({ \ 710 typeof(val) __val = (val); \ 711 typeof(val) __min = (min); \ 712 typeof(val) __max = (max); \ 713 __val = __val < __min ? __min: __val; \ 714 __val > __max ? __max: __val; }) 715 716 717/* 718 * swap - swap value of @a and @b 719 */ 720#define swap(a, b) \ 721 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 722 723/** 724 * container_of - cast a member of a structure out to the containing structure 725 * @ptr: the pointer to the member. 726 * @type: the type of the container struct this is embedded in. 727 * @member: the name of the member within the struct. 728 * 729 */ 730#define container_of(ptr, type, member) ({ \ 731 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 732 (type *)( (char *)__mptr - offsetof(type,member) );}) 733 734struct sysinfo; 735extern int do_sysinfo(struct sysinfo *info); 736 737#endif /* __KERNEL__ */ 738 739#define SI_LOAD_SHIFT 16 740struct sysinfo { 741 long uptime; /* Seconds since boot */ 742 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 743 unsigned long totalram; /* Total usable main memory size */ 744 unsigned long freeram; /* Available memory size */ 745 unsigned long sharedram; /* Amount of shared memory */ 746 unsigned long bufferram; /* Memory used by buffers */ 747 unsigned long totalswap; /* Total swap space size */ 748 unsigned long freeswap; /* swap space still available */ 749 unsigned short procs; /* Number of current processes */ 750 unsigned short pad; /* explicit padding for m68k */ 751 unsigned long totalhigh; /* Total high memory size */ 752 unsigned long freehigh; /* Available high memory size */ 753 unsigned int mem_unit; /* Memory unit size in bytes */ 754 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 755}; 756 757/* Force a compilation error if condition is true */ 758#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 759 760/* Force a compilation error if condition is constant and true */ 761#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 762 763/* Force a compilation error if a constant expression is not a power of 2 */ 764#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 765 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 766 767/* Force a compilation error if condition is true, but also produce a 768 result (of value 0 and type size_t), so the expression can be used 769 e.g. in a structure initializer (or where-ever else comma expressions 770 aren't permitted). */ 771#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 772#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 773 774/* Trap pasters of __FUNCTION__ at compile-time */ 775#define __FUNCTION__ (__func__) 776 777/* This helps us to avoid #ifdef CONFIG_NUMA */ 778#ifdef CONFIG_NUMA 779#define NUMA_BUILD 1 780#else 781#define NUMA_BUILD 0 782#endif 783 784/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 785#ifdef CONFIG_FTRACE_MCOUNT_RECORD 786# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 787#endif 788 789#endif 790