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