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