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) ((((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>" 119 120 extern 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]) 126 127 struct completion; 128 struct pt_regs; 129 struct user; 130 131 #ifdef CONFIG_PREEMPT_VOLUNTARY 132 extern 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 166 void might_fault(void); 167 #else 168 static inline void might_fault(void) 169 { 170 might_sleep(); 171 } 172 #endif 173 174 extern struct atomic_notifier_head panic_notifier_list; 175 extern long (*panic_blink)(long time); 176 NORET_TYPE void panic(const char * fmt, ...) 177 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 178 extern void oops_enter(void); 179 extern void oops_exit(void); 180 extern int oops_may_print(void); 181 NORET_TYPE void do_exit(long error_code) 182 ATTRIB_NORET; 183 NORET_TYPE void complete_and_exit(struct completion *, long) 184 ATTRIB_NORET; 185 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 186 extern long simple_strtol(const char *,char **,unsigned int); 187 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 188 extern long long simple_strtoll(const char *,char **,unsigned int); 189 extern int strict_strtoul(const char *, unsigned int, unsigned long *); 190 extern int strict_strtol(const char *, unsigned int, long *); 191 extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 192 extern int strict_strtoll(const char *, unsigned int, long long *); 193 extern int sprintf(char * buf, const char * fmt, ...) 194 __attribute__ ((format (printf, 2, 3))); 195 extern int vsprintf(char *buf, const char *, va_list) 196 __attribute__ ((format (printf, 2, 0))); 197 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 198 __attribute__ ((format (printf, 3, 4))); 199 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 200 __attribute__ ((format (printf, 3, 0))); 201 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 202 __attribute__ ((format (printf, 3, 4))); 203 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 204 __attribute__ ((format (printf, 3, 0))); 205 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 206 __attribute__ ((format (printf, 2, 3))); 207 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 208 209 extern int sscanf(const char *, const char *, ...) 210 __attribute__ ((format (scanf, 2, 3))); 211 extern int vsscanf(const char *, const char *, va_list) 212 __attribute__ ((format (scanf, 2, 0))); 213 214 extern int get_option(char **str, int *pint); 215 extern char *get_options(const char *str, int nints, int *ints); 216 extern unsigned long long memparse(const char *ptr, char **retptr); 217 218 extern int core_kernel_text(unsigned long addr); 219 extern int __kernel_text_address(unsigned long addr); 220 extern int kernel_text_address(unsigned long addr); 221 extern int func_ptr_is_kernel_text(void *ptr); 222 223 struct pid; 224 extern 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 251 asmlinkage int vprintk(const char *fmt, va_list args) 252 __attribute__ ((format (printf, 1, 0))); 253 asmlinkage int printk(const char * fmt, ...) 254 __attribute__ ((format (printf, 1, 2))) __cold; 255 256 extern int __printk_ratelimit(const char *func); 257 #define printk_ratelimit() __printk_ratelimit(__func__) 258 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 259 unsigned int interval_msec); 260 261 extern 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 }) 274 275 void log_buf_kexec_setup(void); 276 #else 277 static inline int vprintk(const char *s, va_list args) 278 __attribute__ ((format (printf, 1, 0))); 279 static inline int vprintk(const char *s, va_list args) { return 0; } 280 static inline int printk(const char *s, ...) 281 __attribute__ ((format (printf, 1, 2))); 282 static inline int __cold printk(const char *s, ...) { return 0; } 283 static inline int printk_ratelimit(void) { return 0; } 284 static 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) 290 291 static inline void log_buf_kexec_setup(void) 292 { 293 } 294 #endif 295 296 extern int printk_needs_cpu(int cpu); 297 extern void printk_tick(void); 298 299 extern void asmlinkage __attribute__((format(printf, 1, 2))) 300 early_printk(const char *fmt, ...); 301 302 unsigned long int_sqrt(unsigned long); 303 304 static inline void console_silent(void) 305 { 306 console_loglevel = 0; 307 } 308 309 static inline void console_verbose(void) 310 { 311 if (console_loglevel) 312 console_loglevel = 15; 313 } 314 315 extern void bust_spinlocks(int yes); 316 extern void wake_up_klogd(void); 317 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 318 extern int panic_timeout; 319 extern int panic_on_oops; 320 extern int panic_on_unrecovered_nmi; 321 extern int panic_on_io_nmi; 322 extern const char *print_tainted(void); 323 extern void add_taint(unsigned flag); 324 extern int test_taint(unsigned flag); 325 extern unsigned long get_taint(void); 326 extern int root_mountflags; 327 328 /* Values used for system_state */ 329 extern 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 11 350 351 extern void dump_stack(void) __cold; 352 353 enum { 354 DUMP_PREFIX_NONE, 355 DUMP_PREFIX_ADDRESS, 356 DUMP_PREFIX_OFFSET 357 }; 358 extern void hex_dump_to_buffer(const void *buf, size_t len, 359 int rowsize, int groupsize, 360 char *linebuf, size_t linebuflen, bool ascii); 361 extern 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); 364 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 365 const void *buf, size_t len); 366 367 extern 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] 370 371 static 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 } 377 378 extern 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 488 void tracing_on(void); 489 void tracing_off(void); 490 /* trace_off_permanent stops recording with no way to bring it back */ 491 void tracing_off_permanent(void); 492 int tracing_is_on(void); 493 #else 494 static inline void tracing_on(void) { } 495 static inline void tracing_off(void) { } 496 static inline void tracing_off_permanent(void) { } 497 static inline int tracing_is_on(void) { return 0; } 498 #endif 499 500 enum ftrace_dump_mode { 501 DUMP_NONE, 502 DUMP_ALL, 503 DUMP_ORIG, 504 }; 505 506 #ifdef CONFIG_TRACING 507 extern void tracing_start(void); 508 extern void tracing_stop(void); 509 extern void ftrace_off_permanent(void); 510 511 static inline void __attribute__ ((format (printf, 1, 2))) 512 ____trace_printk_check_format(const char *fmt, ...) 513 { 514 } 515 #define __trace_printk_check_format(fmt, args...) \ 516 do { \ 517 if (0) \ 518 ____trace_printk_check_format(fmt, ##args); \ 519 } while (0) 520 521 /** 522 * trace_printk - printf formatting in the ftrace buffer 523 * @fmt: the printf format for printing 524 * 525 * Note: __trace_printk is an internal function for trace_printk and 526 * the @ip is passed in via the trace_printk macro. 527 * 528 * This function allows a kernel developer to debug fast path sections 529 * that printk is not appropriate for. By scattering in various 530 * printk like tracing in the code, a developer can quickly see 531 * where problems are occurring. 532 * 533 * This is intended as a debugging tool for the developer only. 534 * Please refrain from leaving trace_printks scattered around in 535 * your code. 536 */ 537 538 #define trace_printk(fmt, args...) \ 539 do { \ 540 __trace_printk_check_format(fmt, ##args); \ 541 if (__builtin_constant_p(fmt)) { \ 542 static const char *trace_printk_fmt \ 543 __attribute__((section("__trace_printk_fmt"))) = \ 544 __builtin_constant_p(fmt) ? fmt : NULL; \ 545 \ 546 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 547 } else \ 548 __trace_printk(_THIS_IP_, fmt, ##args); \ 549 } while (0) 550 551 extern int 552 __trace_bprintk(unsigned long ip, const char *fmt, ...) 553 __attribute__ ((format (printf, 2, 3))); 554 555 extern int 556 __trace_printk(unsigned long ip, const char *fmt, ...) 557 __attribute__ ((format (printf, 2, 3))); 558 559 extern void trace_dump_stack(void); 560 561 /* 562 * The double __builtin_constant_p is because gcc will give us an error 563 * if we try to allocate the static variable to fmt if it is not a 564 * constant. Even with the outer if statement. 565 */ 566 #define ftrace_vprintk(fmt, vargs) \ 567 do { \ 568 if (__builtin_constant_p(fmt)) { \ 569 static const char *trace_printk_fmt \ 570 __attribute__((section("__trace_printk_fmt"))) = \ 571 __builtin_constant_p(fmt) ? fmt : NULL; \ 572 \ 573 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 574 } else \ 575 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 576 } while (0) 577 578 extern int 579 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 580 581 extern int 582 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 583 584 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 585 #else 586 static inline int 587 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 588 589 static inline void tracing_start(void) { } 590 static inline void tracing_stop(void) { } 591 static inline void ftrace_off_permanent(void) { } 592 static inline void trace_dump_stack(void) { } 593 static inline int 594 trace_printk(const char *fmt, ...) 595 { 596 return 0; 597 } 598 static inline int 599 ftrace_vprintk(const char *fmt, va_list ap) 600 { 601 return 0; 602 } 603 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 604 #endif /* CONFIG_TRACING */ 605 606 /* 607 * Display an IP address in readable format. 608 */ 609 610 #define NIPQUAD(addr) \ 611 ((unsigned char *)&addr)[0], \ 612 ((unsigned char *)&addr)[1], \ 613 ((unsigned char *)&addr)[2], \ 614 ((unsigned char *)&addr)[3] 615 #define NIPQUAD_FMT "%u.%u.%u.%u" 616 617 /* 618 * min()/max()/clamp() macros that also do 619 * strict type-checking.. See the 620 * "unnecessary" pointer comparison. 621 */ 622 #define min(x, y) ({ \ 623 typeof(x) _min1 = (x); \ 624 typeof(y) _min2 = (y); \ 625 (void) (&_min1 == &_min2); \ 626 _min1 < _min2 ? _min1 : _min2; }) 627 628 #define max(x, y) ({ \ 629 typeof(x) _max1 = (x); \ 630 typeof(y) _max2 = (y); \ 631 (void) (&_max1 == &_max2); \ 632 _max1 > _max2 ? _max1 : _max2; }) 633 634 /** 635 * clamp - return a value clamped to a given range with strict typechecking 636 * @val: current value 637 * @min: minimum allowable value 638 * @max: maximum allowable value 639 * 640 * This macro does strict typechecking of min/max to make sure they are of the 641 * same type as val. See the unnecessary pointer comparisons. 642 */ 643 #define clamp(val, min, max) ({ \ 644 typeof(val) __val = (val); \ 645 typeof(min) __min = (min); \ 646 typeof(max) __max = (max); \ 647 (void) (&__val == &__min); \ 648 (void) (&__val == &__max); \ 649 __val = __val < __min ? __min: __val; \ 650 __val > __max ? __max: __val; }) 651 652 /* 653 * ..and if you can't take the strict 654 * types, you can specify one yourself. 655 * 656 * Or not use min/max/clamp at all, of course. 657 */ 658 #define min_t(type, x, y) ({ \ 659 type __min1 = (x); \ 660 type __min2 = (y); \ 661 __min1 < __min2 ? __min1: __min2; }) 662 663 #define max_t(type, x, y) ({ \ 664 type __max1 = (x); \ 665 type __max2 = (y); \ 666 __max1 > __max2 ? __max1: __max2; }) 667 668 /** 669 * clamp_t - return a value clamped to a given range using a given type 670 * @type: the type of variable to use 671 * @val: current value 672 * @min: minimum allowable value 673 * @max: maximum allowable value 674 * 675 * This macro does no typechecking and uses temporary variables of type 676 * 'type' to make all the comparisons. 677 */ 678 #define clamp_t(type, val, min, max) ({ \ 679 type __val = (val); \ 680 type __min = (min); \ 681 type __max = (max); \ 682 __val = __val < __min ? __min: __val; \ 683 __val > __max ? __max: __val; }) 684 685 /** 686 * clamp_val - return a value clamped to a given range using val's type 687 * @val: current value 688 * @min: minimum allowable value 689 * @max: maximum allowable value 690 * 691 * This macro does no typechecking and uses temporary variables of whatever 692 * type the input argument 'val' is. This is useful when val is an unsigned 693 * type and min and max are literals that will otherwise be assigned a signed 694 * integer type. 695 */ 696 #define clamp_val(val, min, max) ({ \ 697 typeof(val) __val = (val); \ 698 typeof(val) __min = (min); \ 699 typeof(val) __max = (max); \ 700 __val = __val < __min ? __min: __val; \ 701 __val > __max ? __max: __val; }) 702 703 704 /* 705 * swap - swap value of @a and @b 706 */ 707 #define swap(a, b) \ 708 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 709 710 /** 711 * container_of - cast a member of a structure out to the containing structure 712 * @ptr: the pointer to the member. 713 * @type: the type of the container struct this is embedded in. 714 * @member: the name of the member within the struct. 715 * 716 */ 717 #define container_of(ptr, type, member) ({ \ 718 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 719 (type *)( (char *)__mptr - offsetof(type,member) );}) 720 721 struct sysinfo; 722 extern int do_sysinfo(struct sysinfo *info); 723 724 #endif /* __KERNEL__ */ 725 726 #ifndef __EXPORTED_HEADERS__ 727 #ifndef __KERNEL__ 728 #warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders 729 #endif /* __KERNEL__ */ 730 #endif /* __EXPORTED_HEADERS__ */ 731 732 #define SI_LOAD_SHIFT 16 733 struct sysinfo { 734 long uptime; /* Seconds since boot */ 735 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 736 unsigned long totalram; /* Total usable main memory size */ 737 unsigned long freeram; /* Available memory size */ 738 unsigned long sharedram; /* Amount of shared memory */ 739 unsigned long bufferram; /* Memory used by buffers */ 740 unsigned long totalswap; /* Total swap space size */ 741 unsigned long freeswap; /* swap space still available */ 742 unsigned short procs; /* Number of current processes */ 743 unsigned short pad; /* explicit padding for m68k */ 744 unsigned long totalhigh; /* Total high memory size */ 745 unsigned long freehigh; /* Available high memory size */ 746 unsigned int mem_unit; /* Memory unit size in bytes */ 747 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 748 }; 749 750 /* Force a compilation error if condition is true */ 751 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 752 753 /* Force a compilation error if condition is constant and true */ 754 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 755 756 /* Force a compilation error if a constant expression is not a power of 2 */ 757 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 758 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 759 760 /* Force a compilation error if condition is true, but also produce a 761 result (of value 0 and type size_t), so the expression can be used 762 e.g. in a structure initializer (or where-ever else comma expressions 763 aren't permitted). */ 764 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 765 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 766 767 /* Trap pasters of __FUNCTION__ at compile-time */ 768 #define __FUNCTION__ (__func__) 769 770 /* This helps us to avoid #ifdef CONFIG_NUMA */ 771 #ifdef CONFIG_NUMA 772 #define NUMA_BUILD 1 773 #else 774 #define NUMA_BUILD 0 775 #endif 776 777 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 778 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 779 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 780 #endif 781 782 #endif 783