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 24 extern const char linux_banner[]; 25 extern 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) ( \ 62 { \ 63 typeof(y) __y = y; \ 64 (((x) + (__y - 1)) / __y) * __y; \ 65 } \ 66 ) 67 #define rounddown(x, y) ( \ 68 { \ 69 typeof(x) __x = (x); \ 70 __x - (__x % (y)); \ 71 } \ 72 ) 73 #define DIV_ROUND_CLOSEST(x, divisor)( \ 74 { \ 75 typeof(divisor) __divisor = divisor; \ 76 (((x) + ((__divisor) / 2)) / (__divisor)); \ 77 } \ 78 ) 79 80 #define _RET_IP_ (unsigned long)__builtin_return_address(0) 81 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 82 83 #ifdef CONFIG_LBDAF 84 # include <asm/div64.h> 85 # define sector_div(a, b) do_div(a, b) 86 #else 87 # define sector_div(n, b)( \ 88 { \ 89 int _res; \ 90 _res = (n) % (b); \ 91 (n) /= (b); \ 92 _res; \ 93 } \ 94 ) 95 #endif 96 97 /** 98 * upper_32_bits - return bits 32-63 of a number 99 * @n: the number we're accessing 100 * 101 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 102 * the "right shift count >= width of type" warning when that quantity is 103 * 32-bits. 104 */ 105 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 106 107 /** 108 * lower_32_bits - return bits 0-31 of a number 109 * @n: the number we're accessing 110 */ 111 #define lower_32_bits(n) ((u32)(n)) 112 113 #define KERN_EMERG "<0>" /* system is unusable */ 114 #define KERN_ALERT "<1>" /* action must be taken immediately */ 115 #define KERN_CRIT "<2>" /* critical conditions */ 116 #define KERN_ERR "<3>" /* error conditions */ 117 #define KERN_WARNING "<4>" /* warning conditions */ 118 #define KERN_NOTICE "<5>" /* normal but significant condition */ 119 #define KERN_INFO "<6>" /* informational */ 120 #define KERN_DEBUG "<7>" /* debug-level messages */ 121 122 /* Use the default kernel loglevel */ 123 #define KERN_DEFAULT "<d>" 124 /* 125 * Annotation for a "continued" line of log printout (only done after a 126 * line that had no enclosing \n). Only to be used by core/arch code 127 * during early bootup (a continued line is not SMP-safe otherwise). 128 */ 129 #define KERN_CONT "<c>" 130 131 extern int console_printk[]; 132 133 #define console_loglevel (console_printk[0]) 134 #define default_message_loglevel (console_printk[1]) 135 #define minimum_console_loglevel (console_printk[2]) 136 #define default_console_loglevel (console_printk[3]) 137 138 struct completion; 139 struct pt_regs; 140 struct user; 141 142 #ifdef CONFIG_PREEMPT_VOLUNTARY 143 extern int _cond_resched(void); 144 # define might_resched() _cond_resched() 145 #else 146 # define might_resched() do { } while (0) 147 #endif 148 149 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 150 void __might_sleep(const char *file, int line, int preempt_offset); 151 /** 152 * might_sleep - annotation for functions that can sleep 153 * 154 * this macro will print a stack trace if it is executed in an atomic 155 * context (spinlock, irq-handler, ...). 156 * 157 * This is a useful debugging help to be able to catch problems early and not 158 * be bitten later when the calling function happens to sleep when it is not 159 * supposed to. 160 */ 161 # define might_sleep() \ 162 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) 163 #else 164 static inline void __might_sleep(const char *file, int line, 165 int preempt_offset) { } 166 # define might_sleep() do { might_resched(); } while (0) 167 #endif 168 169 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 170 171 #define abs(x) ({ \ 172 long __x = (x); \ 173 (__x < 0) ? -__x : __x; \ 174 }) 175 176 #define abs64(x) ({ \ 177 s64 __x = (x); \ 178 (__x < 0) ? -__x : __x; \ 179 }) 180 181 #ifdef CONFIG_PROVE_LOCKING 182 void might_fault(void); 183 #else 184 static inline void might_fault(void) 185 { 186 might_sleep(); 187 } 188 #endif 189 190 struct va_format { 191 const char *fmt; 192 va_list *va; 193 }; 194 195 extern struct atomic_notifier_head panic_notifier_list; 196 extern long (*panic_blink)(int state); 197 NORET_TYPE void panic(const char * fmt, ...) 198 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 199 extern void oops_enter(void); 200 extern void oops_exit(void); 201 void print_oops_end_marker(void); 202 extern int oops_may_print(void); 203 NORET_TYPE void do_exit(long error_code) 204 ATTRIB_NORET; 205 NORET_TYPE void complete_and_exit(struct completion *, long) 206 ATTRIB_NORET; 207 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 208 extern long simple_strtol(const char *,char **,unsigned int); 209 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 210 extern long long simple_strtoll(const char *,char **,unsigned int); 211 extern int __must_check strict_strtoul(const char *, unsigned int, unsigned long *); 212 extern int __must_check strict_strtol(const char *, unsigned int, long *); 213 extern int __must_check strict_strtoull(const char *, unsigned int, unsigned long long *); 214 extern int __must_check strict_strtoll(const char *, unsigned int, long long *); 215 extern int sprintf(char * buf, const char * fmt, ...) 216 __attribute__ ((format (printf, 2, 3))); 217 extern int vsprintf(char *buf, const char *, va_list) 218 __attribute__ ((format (printf, 2, 0))); 219 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 220 __attribute__ ((format (printf, 3, 4))); 221 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 222 __attribute__ ((format (printf, 3, 0))); 223 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 224 __attribute__ ((format (printf, 3, 4))); 225 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 226 __attribute__ ((format (printf, 3, 0))); 227 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 228 __attribute__ ((format (printf, 2, 3))); 229 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 230 231 extern int sscanf(const char *, const char *, ...) 232 __attribute__ ((format (scanf, 2, 3))); 233 extern int vsscanf(const char *, const char *, va_list) 234 __attribute__ ((format (scanf, 2, 0))); 235 236 extern int get_option(char **str, int *pint); 237 extern char *get_options(const char *str, int nints, int *ints); 238 extern unsigned long long memparse(const char *ptr, char **retptr); 239 240 extern int core_kernel_text(unsigned long addr); 241 extern int __kernel_text_address(unsigned long addr); 242 extern int kernel_text_address(unsigned long addr); 243 extern int func_ptr_is_kernel_text(void *ptr); 244 245 struct pid; 246 extern struct pid *session_of_pgrp(struct pid *pgrp); 247 248 /* 249 * FW_BUG 250 * Add this to a message where you are sure the firmware is buggy or behaves 251 * really stupid or out of spec. Be aware that the responsible BIOS developer 252 * should be able to fix this issue or at least get a concrete idea of the 253 * problem by reading your message without the need of looking at the kernel 254 * code. 255 * 256 * Use it for definite and high priority BIOS bugs. 257 * 258 * FW_WARN 259 * Use it for not that clear (e.g. could the kernel messed up things already?) 260 * and medium priority BIOS bugs. 261 * 262 * FW_INFO 263 * Use this one if you want to tell the user or vendor about something 264 * suspicious, but generally harmless related to the firmware. 265 * 266 * Use it for information or very low priority BIOS bugs. 267 */ 268 #define FW_BUG "[Firmware Bug]: " 269 #define FW_WARN "[Firmware Warn]: " 270 #define FW_INFO "[Firmware Info]: " 271 272 /* 273 * HW_ERR 274 * Add this to a message for hardware errors, so that user can report 275 * it to hardware vendor instead of LKML or software vendor. 276 */ 277 #define HW_ERR "[Hardware Error]: " 278 279 #ifdef CONFIG_PRINTK 280 asmlinkage int vprintk(const char *fmt, va_list args) 281 __attribute__ ((format (printf, 1, 0))); 282 asmlinkage int printk(const char * fmt, ...) 283 __attribute__ ((format (printf, 1, 2))) __cold; 284 285 /* 286 * Please don't use printk_ratelimit(), because it shares ratelimiting state 287 * with all other unrelated printk_ratelimit() callsites. Instead use 288 * printk_ratelimited() or plain old __ratelimit(). 289 */ 290 extern int __printk_ratelimit(const char *func); 291 #define printk_ratelimit() __printk_ratelimit(__func__) 292 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 293 unsigned int interval_msec); 294 295 extern int printk_delay_msec; 296 297 /* 298 * Print a one-time message (analogous to WARN_ONCE() et al): 299 */ 300 #define printk_once(x...) ({ \ 301 static bool __print_once; \ 302 \ 303 if (!__print_once) { \ 304 __print_once = true; \ 305 printk(x); \ 306 } \ 307 }) 308 309 void log_buf_kexec_setup(void); 310 #else 311 static inline int vprintk(const char *s, va_list args) 312 __attribute__ ((format (printf, 1, 0))); 313 static inline int vprintk(const char *s, va_list args) { return 0; } 314 static inline int printk(const char *s, ...) 315 __attribute__ ((format (printf, 1, 2))); 316 static inline int __cold printk(const char *s, ...) { return 0; } 317 static inline int printk_ratelimit(void) { return 0; } 318 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 319 unsigned int interval_msec) \ 320 { return false; } 321 322 /* No effect, but we still get type checking even in the !PRINTK case: */ 323 #define printk_once(x...) printk(x) 324 325 static inline void log_buf_kexec_setup(void) 326 { 327 } 328 #endif 329 330 /* 331 * Dummy printk for disabled debugging statements to use whilst maintaining 332 * gcc's format and side-effect checking. 333 */ 334 static inline __attribute__ ((format (printf, 1, 2))) 335 int no_printk(const char *s, ...) { return 0; } 336 337 extern int printk_needs_cpu(int cpu); 338 extern void printk_tick(void); 339 340 extern void asmlinkage __attribute__((format(printf, 1, 2))) 341 early_printk(const char *fmt, ...); 342 343 unsigned long int_sqrt(unsigned long); 344 345 static inline void console_silent(void) 346 { 347 console_loglevel = 0; 348 } 349 350 static inline void console_verbose(void) 351 { 352 if (console_loglevel) 353 console_loglevel = 15; 354 } 355 356 extern void bust_spinlocks(int yes); 357 extern void wake_up_klogd(void); 358 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 359 extern int panic_timeout; 360 extern int panic_on_oops; 361 extern int panic_on_unrecovered_nmi; 362 extern int panic_on_io_nmi; 363 extern const char *print_tainted(void); 364 extern void add_taint(unsigned flag); 365 extern int test_taint(unsigned flag); 366 extern unsigned long get_taint(void); 367 extern int root_mountflags; 368 369 /* Values used for system_state */ 370 extern enum system_states { 371 SYSTEM_BOOTING, 372 SYSTEM_RUNNING, 373 SYSTEM_HALT, 374 SYSTEM_POWER_OFF, 375 SYSTEM_RESTART, 376 SYSTEM_SUSPEND_DISK, 377 } system_state; 378 379 #define TAINT_PROPRIETARY_MODULE 0 380 #define TAINT_FORCED_MODULE 1 381 #define TAINT_UNSAFE_SMP 2 382 #define TAINT_FORCED_RMMOD 3 383 #define TAINT_MACHINE_CHECK 4 384 #define TAINT_BAD_PAGE 5 385 #define TAINT_USER 6 386 #define TAINT_DIE 7 387 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 388 #define TAINT_WARN 9 389 #define TAINT_CRAP 10 390 #define TAINT_FIRMWARE_WORKAROUND 11 391 392 extern void dump_stack(void) __cold; 393 394 enum { 395 DUMP_PREFIX_NONE, 396 DUMP_PREFIX_ADDRESS, 397 DUMP_PREFIX_OFFSET 398 }; 399 extern void hex_dump_to_buffer(const void *buf, size_t len, 400 int rowsize, int groupsize, 401 char *linebuf, size_t linebuflen, bool ascii); 402 extern void print_hex_dump(const char *level, const char *prefix_str, 403 int prefix_type, int rowsize, int groupsize, 404 const void *buf, size_t len, bool ascii); 405 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 406 const void *buf, size_t len); 407 408 extern const char hex_asc[]; 409 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 410 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 411 412 static inline char *pack_hex_byte(char *buf, u8 byte) 413 { 414 *buf++ = hex_asc_hi(byte); 415 *buf++ = hex_asc_lo(byte); 416 return buf; 417 } 418 419 extern int hex_to_bin(char ch); 420 421 #ifndef pr_fmt 422 #define pr_fmt(fmt) fmt 423 #endif 424 425 #define pr_emerg(fmt, ...) \ 426 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 427 #define pr_alert(fmt, ...) \ 428 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 429 #define pr_crit(fmt, ...) \ 430 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 431 #define pr_err(fmt, ...) \ 432 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 433 #define pr_warning(fmt, ...) \ 434 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 435 #define pr_warn pr_warning 436 #define pr_notice(fmt, ...) \ 437 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 438 #define pr_info(fmt, ...) \ 439 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 440 #define pr_cont(fmt, ...) \ 441 printk(KERN_CONT fmt, ##__VA_ARGS__) 442 443 /* pr_devel() should produce zero code unless DEBUG is defined */ 444 #ifdef DEBUG 445 #define pr_devel(fmt, ...) \ 446 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 447 #else 448 #define pr_devel(fmt, ...) \ 449 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 450 #endif 451 452 /* If you are writing a driver, please use dev_dbg instead */ 453 #if defined(DEBUG) 454 #define pr_debug(fmt, ...) \ 455 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 456 #elif defined(CONFIG_DYNAMIC_DEBUG) 457 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 458 #define pr_debug(fmt, ...) \ 459 dynamic_pr_debug(fmt, ##__VA_ARGS__) 460 #else 461 #define pr_debug(fmt, ...) \ 462 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 463 #endif 464 465 /* 466 * ratelimited messages with local ratelimit_state, 467 * no local ratelimit_state used in the !PRINTK case 468 */ 469 #ifdef CONFIG_PRINTK 470 #define printk_ratelimited(fmt, ...) ({ \ 471 static DEFINE_RATELIMIT_STATE(_rs, \ 472 DEFAULT_RATELIMIT_INTERVAL, \ 473 DEFAULT_RATELIMIT_BURST); \ 474 \ 475 if (__ratelimit(&_rs)) \ 476 printk(fmt, ##__VA_ARGS__); \ 477 }) 478 #else 479 /* No effect, but we still get type checking even in the !PRINTK case: */ 480 #define printk_ratelimited printk 481 #endif 482 483 #define pr_emerg_ratelimited(fmt, ...) \ 484 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 485 #define pr_alert_ratelimited(fmt, ...) \ 486 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 487 #define pr_crit_ratelimited(fmt, ...) \ 488 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 489 #define pr_err_ratelimited(fmt, ...) \ 490 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 491 #define pr_warning_ratelimited(fmt, ...) \ 492 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 493 #define pr_warn_ratelimited pr_warning_ratelimited 494 #define pr_notice_ratelimited(fmt, ...) \ 495 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 496 #define pr_info_ratelimited(fmt, ...) \ 497 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 498 /* no pr_cont_ratelimited, don't do that... */ 499 /* If you are writing a driver, please use dev_dbg instead */ 500 #if defined(DEBUG) 501 #define pr_debug_ratelimited(fmt, ...) \ 502 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 503 #else 504 #define pr_debug_ratelimited(fmt, ...) \ 505 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ 506 ##__VA_ARGS__); 0; }) 507 #endif 508 509 /* 510 * General tracing related utility functions - trace_printk(), 511 * tracing_on/tracing_off and tracing_start()/tracing_stop 512 * 513 * Use tracing_on/tracing_off when you want to quickly turn on or off 514 * tracing. It simply enables or disables the recording of the trace events. 515 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 516 * file, which gives a means for the kernel and userspace to interact. 517 * Place a tracing_off() in the kernel where you want tracing to end. 518 * From user space, examine the trace, and then echo 1 > tracing_on 519 * to continue tracing. 520 * 521 * tracing_stop/tracing_start has slightly more overhead. It is used 522 * by things like suspend to ram where disabling the recording of the 523 * trace is not enough, but tracing must actually stop because things 524 * like calling smp_processor_id() may crash the system. 525 * 526 * Most likely, you want to use tracing_on/tracing_off. 527 */ 528 #ifdef CONFIG_RING_BUFFER 529 void tracing_on(void); 530 void tracing_off(void); 531 /* trace_off_permanent stops recording with no way to bring it back */ 532 void tracing_off_permanent(void); 533 int tracing_is_on(void); 534 #else 535 static inline void tracing_on(void) { } 536 static inline void tracing_off(void) { } 537 static inline void tracing_off_permanent(void) { } 538 static inline int tracing_is_on(void) { return 0; } 539 #endif 540 541 enum ftrace_dump_mode { 542 DUMP_NONE, 543 DUMP_ALL, 544 DUMP_ORIG, 545 }; 546 547 #ifdef CONFIG_TRACING 548 extern void tracing_start(void); 549 extern void tracing_stop(void); 550 extern void ftrace_off_permanent(void); 551 552 static inline void __attribute__ ((format (printf, 1, 2))) 553 ____trace_printk_check_format(const char *fmt, ...) 554 { 555 } 556 #define __trace_printk_check_format(fmt, args...) \ 557 do { \ 558 if (0) \ 559 ____trace_printk_check_format(fmt, ##args); \ 560 } while (0) 561 562 /** 563 * trace_printk - printf formatting in the ftrace buffer 564 * @fmt: the printf format for printing 565 * 566 * Note: __trace_printk is an internal function for trace_printk and 567 * the @ip is passed in via the trace_printk macro. 568 * 569 * This function allows a kernel developer to debug fast path sections 570 * that printk is not appropriate for. By scattering in various 571 * printk like tracing in the code, a developer can quickly see 572 * where problems are occurring. 573 * 574 * This is intended as a debugging tool for the developer only. 575 * Please refrain from leaving trace_printks scattered around in 576 * your code. 577 */ 578 579 #define trace_printk(fmt, args...) \ 580 do { \ 581 __trace_printk_check_format(fmt, ##args); \ 582 if (__builtin_constant_p(fmt)) { \ 583 static const char *trace_printk_fmt \ 584 __attribute__((section("__trace_printk_fmt"))) = \ 585 __builtin_constant_p(fmt) ? fmt : NULL; \ 586 \ 587 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 588 } else \ 589 __trace_printk(_THIS_IP_, fmt, ##args); \ 590 } while (0) 591 592 extern int 593 __trace_bprintk(unsigned long ip, const char *fmt, ...) 594 __attribute__ ((format (printf, 2, 3))); 595 596 extern int 597 __trace_printk(unsigned long ip, const char *fmt, ...) 598 __attribute__ ((format (printf, 2, 3))); 599 600 extern void trace_dump_stack(void); 601 602 /* 603 * The double __builtin_constant_p is because gcc will give us an error 604 * if we try to allocate the static variable to fmt if it is not a 605 * constant. Even with the outer if statement. 606 */ 607 #define ftrace_vprintk(fmt, vargs) \ 608 do { \ 609 if (__builtin_constant_p(fmt)) { \ 610 static const char *trace_printk_fmt \ 611 __attribute__((section("__trace_printk_fmt"))) = \ 612 __builtin_constant_p(fmt) ? fmt : NULL; \ 613 \ 614 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 615 } else \ 616 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 617 } while (0) 618 619 extern int 620 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 621 622 extern int 623 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 624 625 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 626 #else 627 static inline int 628 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 629 630 static inline void tracing_start(void) { } 631 static inline void tracing_stop(void) { } 632 static inline void ftrace_off_permanent(void) { } 633 static inline void trace_dump_stack(void) { } 634 static inline int 635 trace_printk(const char *fmt, ...) 636 { 637 return 0; 638 } 639 static inline int 640 ftrace_vprintk(const char *fmt, va_list ap) 641 { 642 return 0; 643 } 644 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 645 #endif /* CONFIG_TRACING */ 646 647 /* 648 * min()/max()/clamp() macros that also do 649 * strict type-checking.. See the 650 * "unnecessary" pointer comparison. 651 */ 652 #define min(x, y) ({ \ 653 typeof(x) _min1 = (x); \ 654 typeof(y) _min2 = (y); \ 655 (void) (&_min1 == &_min2); \ 656 _min1 < _min2 ? _min1 : _min2; }) 657 658 #define max(x, y) ({ \ 659 typeof(x) _max1 = (x); \ 660 typeof(y) _max2 = (y); \ 661 (void) (&_max1 == &_max2); \ 662 _max1 > _max2 ? _max1 : _max2; }) 663 664 #define min3(x, y, z) ({ \ 665 typeof(x) _min1 = (x); \ 666 typeof(y) _min2 = (y); \ 667 typeof(z) _min3 = (z); \ 668 (void) (&_min1 == &_min2); \ 669 (void) (&_min1 == &_min3); \ 670 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ 671 (_min2 < _min3 ? _min2 : _min3); }) 672 673 #define max3(x, y, z) ({ \ 674 typeof(x) _max1 = (x); \ 675 typeof(y) _max2 = (y); \ 676 typeof(z) _max3 = (z); \ 677 (void) (&_max1 == &_max2); \ 678 (void) (&_max1 == &_max3); \ 679 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ 680 (_max2 > _max3 ? _max2 : _max3); }) 681 682 /** 683 * min_not_zero - return the minimum that is _not_ zero, unless both are zero 684 * @x: value1 685 * @y: value2 686 */ 687 #define min_not_zero(x, y) ({ \ 688 typeof(x) __x = (x); \ 689 typeof(y) __y = (y); \ 690 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) 691 692 /** 693 * clamp - return a value clamped to a given range with strict typechecking 694 * @val: current value 695 * @min: minimum allowable value 696 * @max: maximum allowable value 697 * 698 * This macro does strict typechecking of min/max to make sure they are of the 699 * same type as val. See the unnecessary pointer comparisons. 700 */ 701 #define clamp(val, min, max) ({ \ 702 typeof(val) __val = (val); \ 703 typeof(min) __min = (min); \ 704 typeof(max) __max = (max); \ 705 (void) (&__val == &__min); \ 706 (void) (&__val == &__max); \ 707 __val = __val < __min ? __min: __val; \ 708 __val > __max ? __max: __val; }) 709 710 /* 711 * ..and if you can't take the strict 712 * types, you can specify one yourself. 713 * 714 * Or not use min/max/clamp at all, of course. 715 */ 716 #define min_t(type, x, y) ({ \ 717 type __min1 = (x); \ 718 type __min2 = (y); \ 719 __min1 < __min2 ? __min1: __min2; }) 720 721 #define max_t(type, x, y) ({ \ 722 type __max1 = (x); \ 723 type __max2 = (y); \ 724 __max1 > __max2 ? __max1: __max2; }) 725 726 /** 727 * clamp_t - return a value clamped to a given range using a given type 728 * @type: the type of variable to use 729 * @val: current value 730 * @min: minimum allowable value 731 * @max: maximum allowable value 732 * 733 * This macro does no typechecking and uses temporary variables of type 734 * 'type' to make all the comparisons. 735 */ 736 #define clamp_t(type, val, min, max) ({ \ 737 type __val = (val); \ 738 type __min = (min); \ 739 type __max = (max); \ 740 __val = __val < __min ? __min: __val; \ 741 __val > __max ? __max: __val; }) 742 743 /** 744 * clamp_val - return a value clamped to a given range using val's type 745 * @val: current value 746 * @min: minimum allowable value 747 * @max: maximum allowable value 748 * 749 * This macro does no typechecking and uses temporary variables of whatever 750 * type the input argument 'val' is. This is useful when val is an unsigned 751 * type and min and max are literals that will otherwise be assigned a signed 752 * integer type. 753 */ 754 #define clamp_val(val, min, max) ({ \ 755 typeof(val) __val = (val); \ 756 typeof(val) __min = (min); \ 757 typeof(val) __max = (max); \ 758 __val = __val < __min ? __min: __val; \ 759 __val > __max ? __max: __val; }) 760 761 762 /* 763 * swap - swap value of @a and @b 764 */ 765 #define swap(a, b) \ 766 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 767 768 /** 769 * container_of - cast a member of a structure out to the containing structure 770 * @ptr: the pointer to the member. 771 * @type: the type of the container struct this is embedded in. 772 * @member: the name of the member within the struct. 773 * 774 */ 775 #define container_of(ptr, type, member) ({ \ 776 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 777 (type *)( (char *)__mptr - offsetof(type,member) );}) 778 779 struct sysinfo; 780 extern int do_sysinfo(struct sysinfo *info); 781 782 #endif /* __KERNEL__ */ 783 784 #define SI_LOAD_SHIFT 16 785 struct sysinfo { 786 long uptime; /* Seconds since boot */ 787 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 788 unsigned long totalram; /* Total usable main memory size */ 789 unsigned long freeram; /* Available memory size */ 790 unsigned long sharedram; /* Amount of shared memory */ 791 unsigned long bufferram; /* Memory used by buffers */ 792 unsigned long totalswap; /* Total swap space size */ 793 unsigned long freeswap; /* swap space still available */ 794 unsigned short procs; /* Number of current processes */ 795 unsigned short pad; /* explicit padding for m68k */ 796 unsigned long totalhigh; /* Total high memory size */ 797 unsigned long freehigh; /* Available high memory size */ 798 unsigned int mem_unit; /* Memory unit size in bytes */ 799 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 800 }; 801 802 /* Force a compilation error if condition is true */ 803 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 804 805 /* Force a compilation error if condition is constant and true */ 806 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 807 808 /* Force a compilation error if a constant expression is not a power of 2 */ 809 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 810 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 811 812 /* Force a compilation error if condition is true, but also produce a 813 result (of value 0 and type size_t), so the expression can be used 814 e.g. in a structure initializer (or where-ever else comma expressions 815 aren't permitted). */ 816 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 817 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 818 819 /* Trap pasters of __FUNCTION__ at compile-time */ 820 #define __FUNCTION__ (__func__) 821 822 /* This helps us to avoid #ifdef CONFIG_NUMA */ 823 #ifdef CONFIG_NUMA 824 #define NUMA_BUILD 1 825 #else 826 #define NUMA_BUILD 0 827 #endif 828 829 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 830 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 831 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 832 #endif 833 834 #endif 835