1 #ifndef _LINUX_KERNEL_H 2 #define _LINUX_KERNEL_H 3 4 /* 5 * 'kernel.h' contains some often-used function prototypes etc 6 */ 7 8 #ifdef __KERNEL__ 9 10 #include <stdarg.h> 11 #include <linux/linkage.h> 12 #include <linux/stddef.h> 13 #include <linux/types.h> 14 #include <linux/compiler.h> 15 #include <linux/bitops.h> 16 #include <linux/log2.h> 17 #include <linux/typecheck.h> 18 #include <linux/dynamic_debug.h> 19 #include <asm/byteorder.h> 20 #include <asm/bug.h> 21 22 extern const char linux_banner[]; 23 extern const char linux_proc_banner[]; 24 25 #define USHORT_MAX ((u16)(~0U)) 26 #define SHORT_MAX ((s16)(USHORT_MAX>>1)) 27 #define SHORT_MIN (-SHORT_MAX - 1) 28 #define INT_MAX ((int)(~0U>>1)) 29 #define INT_MIN (-INT_MAX - 1) 30 #define UINT_MAX (~0U) 31 #define LONG_MAX ((long)(~0UL>>1)) 32 #define LONG_MIN (-LONG_MAX - 1) 33 #define ULONG_MAX (~0UL) 34 #define LLONG_MAX ((long long)(~0ULL>>1)) 35 #define LLONG_MIN (-LLONG_MAX - 1) 36 #define ULLONG_MAX (~0ULL) 37 38 #define STACK_MAGIC 0xdeadbeef 39 40 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) 41 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) 42 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) 43 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) 44 45 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 46 47 /* 48 * This looks more complex than it should be. But we need to 49 * get the type for the ~ right in round_down (it needs to be 50 * as wide as the result!), and we want to evaluate the macro 51 * arguments just once each. 52 */ 53 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 54 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 55 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 56 57 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 59 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 60 #define DIV_ROUND_CLOSEST(x, divisor)( \ 61 { \ 62 typeof(divisor) __divisor = divisor; \ 63 (((x) + ((__divisor) / 2)) / (__divisor)); \ 64 } \ 65 ) 66 67 #define _RET_IP_ (unsigned long)__builtin_return_address(0) 68 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 69 70 #ifdef CONFIG_LBDAF 71 # include <asm/div64.h> 72 # define sector_div(a, b) do_div(a, b) 73 #else 74 # define sector_div(n, b)( \ 75 { \ 76 int _res; \ 77 _res = (n) % (b); \ 78 (n) /= (b); \ 79 _res; \ 80 } \ 81 ) 82 #endif 83 84 /** 85 * upper_32_bits - return bits 32-63 of a number 86 * @n: the number we're accessing 87 * 88 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 89 * the "right shift count >= width of type" warning when that quantity is 90 * 32-bits. 91 */ 92 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 93 94 /** 95 * lower_32_bits - return bits 0-31 of a number 96 * @n: the number we're accessing 97 */ 98 #define lower_32_bits(n) ((u32)(n)) 99 100 #define KERN_EMERG "<0>" /* system is unusable */ 101 #define KERN_ALERT "<1>" /* action must be taken immediately */ 102 #define KERN_CRIT "<2>" /* critical conditions */ 103 #define KERN_ERR "<3>" /* error conditions */ 104 #define KERN_WARNING "<4>" /* warning conditions */ 105 #define KERN_NOTICE "<5>" /* normal but significant condition */ 106 #define KERN_INFO "<6>" /* informational */ 107 #define KERN_DEBUG "<7>" /* debug-level messages */ 108 109 /* Use the default kernel loglevel */ 110 #define KERN_DEFAULT "<d>" 111 /* 112 * Annotation for a "continued" line of log printout (only done after a 113 * line that had no enclosing \n). Only to be used by core/arch code 114 * during early bootup (a continued line is not SMP-safe otherwise). 115 */ 116 #define KERN_CONT "<c>" 117 118 extern int console_printk[]; 119 120 #define console_loglevel (console_printk[0]) 121 #define default_message_loglevel (console_printk[1]) 122 #define minimum_console_loglevel (console_printk[2]) 123 #define default_console_loglevel (console_printk[3]) 124 125 struct completion; 126 struct pt_regs; 127 struct user; 128 129 #ifdef CONFIG_PREEMPT_VOLUNTARY 130 extern int _cond_resched(void); 131 # define might_resched() _cond_resched() 132 #else 133 # define might_resched() do { } while (0) 134 #endif 135 136 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 137 void __might_sleep(const char *file, int line, int preempt_offset); 138 /** 139 * might_sleep - annotation for functions that can sleep 140 * 141 * this macro will print a stack trace if it is executed in an atomic 142 * context (spinlock, irq-handler, ...). 143 * 144 * This is a useful debugging help to be able to catch problems early and not 145 * be bitten later when the calling function happens to sleep when it is not 146 * supposed to. 147 */ 148 # define might_sleep() \ 149 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) 150 #else 151 static inline void __might_sleep(const char *file, int line, 152 int preempt_offset) { } 153 # define might_sleep() do { might_resched(); } while (0) 154 #endif 155 156 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 157 158 #define abs(x) ({ \ 159 long __x = (x); \ 160 (__x < 0) ? -__x : __x; \ 161 }) 162 163 #ifdef CONFIG_PROVE_LOCKING 164 void might_fault(void); 165 #else 166 static inline void might_fault(void) 167 { 168 might_sleep(); 169 } 170 #endif 171 172 extern struct atomic_notifier_head panic_notifier_list; 173 extern long (*panic_blink)(long time); 174 NORET_TYPE void panic(const char * fmt, ...) 175 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 176 extern void oops_enter(void); 177 extern void oops_exit(void); 178 extern int oops_may_print(void); 179 NORET_TYPE void do_exit(long error_code) 180 ATTRIB_NORET; 181 NORET_TYPE void complete_and_exit(struct completion *, long) 182 ATTRIB_NORET; 183 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 184 extern long simple_strtol(const char *,char **,unsigned int); 185 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 186 extern long long simple_strtoll(const char *,char **,unsigned int); 187 extern int strict_strtoul(const char *, unsigned int, unsigned long *); 188 extern int strict_strtol(const char *, unsigned int, long *); 189 extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 190 extern int strict_strtoll(const char *, unsigned int, long long *); 191 extern int sprintf(char * buf, const char * fmt, ...) 192 __attribute__ ((format (printf, 2, 3))); 193 extern int vsprintf(char *buf, const char *, va_list) 194 __attribute__ ((format (printf, 2, 0))); 195 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 196 __attribute__ ((format (printf, 3, 4))); 197 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 198 __attribute__ ((format (printf, 3, 0))); 199 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 200 __attribute__ ((format (printf, 3, 4))); 201 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 202 __attribute__ ((format (printf, 3, 0))); 203 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 204 __attribute__ ((format (printf, 2, 3))); 205 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 206 207 extern int sscanf(const char *, const char *, ...) 208 __attribute__ ((format (scanf, 2, 3))); 209 extern int vsscanf(const char *, const char *, va_list) 210 __attribute__ ((format (scanf, 2, 0))); 211 212 extern int get_option(char **str, int *pint); 213 extern char *get_options(const char *str, int nints, int *ints); 214 extern unsigned long long memparse(const char *ptr, char **retptr); 215 216 extern int core_kernel_text(unsigned long addr); 217 extern int __kernel_text_address(unsigned long addr); 218 extern int kernel_text_address(unsigned long addr); 219 extern int func_ptr_is_kernel_text(void *ptr); 220 221 struct pid; 222 extern struct pid *session_of_pgrp(struct pid *pgrp); 223 224 /* 225 * FW_BUG 226 * Add this to a message where you are sure the firmware is buggy or behaves 227 * really stupid or out of spec. Be aware that the responsible BIOS developer 228 * should be able to fix this issue or at least get a concrete idea of the 229 * problem by reading your message without the need of looking at the kernel 230 * code. 231 * 232 * Use it for definite and high priority BIOS bugs. 233 * 234 * FW_WARN 235 * Use it for not that clear (e.g. could the kernel messed up things already?) 236 * and medium priority BIOS bugs. 237 * 238 * FW_INFO 239 * Use this one if you want to tell the user or vendor about something 240 * suspicious, but generally harmless related to the firmware. 241 * 242 * Use it for information or very low priority BIOS bugs. 243 */ 244 #define FW_BUG "[Firmware Bug]: " 245 #define FW_WARN "[Firmware Warn]: " 246 #define FW_INFO "[Firmware Info]: " 247 248 #ifdef CONFIG_PRINTK 249 asmlinkage int vprintk(const char *fmt, va_list args) 250 __attribute__ ((format (printf, 1, 0))); 251 asmlinkage int printk(const char * fmt, ...) 252 __attribute__ ((format (printf, 1, 2))) __cold; 253 254 extern int __printk_ratelimit(const char *func); 255 #define printk_ratelimit() __printk_ratelimit(__func__) 256 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 257 unsigned int interval_msec); 258 259 extern int printk_delay_msec; 260 261 /* 262 * Print a one-time message (analogous to WARN_ONCE() et al): 263 */ 264 #define printk_once(x...) ({ \ 265 static bool __print_once; \ 266 \ 267 if (!__print_once) { \ 268 __print_once = true; \ 269 printk(x); \ 270 } \ 271 }) 272 273 void log_buf_kexec_setup(void); 274 #else 275 static inline int vprintk(const char *s, va_list args) 276 __attribute__ ((format (printf, 1, 0))); 277 static inline int vprintk(const char *s, va_list args) { return 0; } 278 static inline int printk(const char *s, ...) 279 __attribute__ ((format (printf, 1, 2))); 280 static inline int __cold printk(const char *s, ...) { return 0; } 281 static inline int printk_ratelimit(void) { return 0; } 282 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 283 unsigned int interval_msec) \ 284 { return false; } 285 286 /* No effect, but we still get type checking even in the !PRINTK case: */ 287 #define printk_once(x...) printk(x) 288 289 static inline void log_buf_kexec_setup(void) 290 { 291 } 292 #endif 293 294 extern int printk_needs_cpu(int cpu); 295 extern void printk_tick(void); 296 297 extern void asmlinkage __attribute__((format(printf, 1, 2))) 298 early_printk(const char *fmt, ...); 299 300 unsigned long int_sqrt(unsigned long); 301 302 static inline void console_silent(void) 303 { 304 console_loglevel = 0; 305 } 306 307 static inline void console_verbose(void) 308 { 309 if (console_loglevel) 310 console_loglevel = 15; 311 } 312 313 extern void bust_spinlocks(int yes); 314 extern void wake_up_klogd(void); 315 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 316 extern int panic_timeout; 317 extern int panic_on_oops; 318 extern int panic_on_unrecovered_nmi; 319 extern int panic_on_io_nmi; 320 extern const char *print_tainted(void); 321 extern void add_taint(unsigned flag); 322 extern int test_taint(unsigned flag); 323 extern unsigned long get_taint(void); 324 extern int root_mountflags; 325 326 /* Values used for system_state */ 327 extern enum system_states { 328 SYSTEM_BOOTING, 329 SYSTEM_RUNNING, 330 SYSTEM_HALT, 331 SYSTEM_POWER_OFF, 332 SYSTEM_RESTART, 333 SYSTEM_SUSPEND_DISK, 334 } system_state; 335 336 #define TAINT_PROPRIETARY_MODULE 0 337 #define TAINT_FORCED_MODULE 1 338 #define TAINT_UNSAFE_SMP 2 339 #define TAINT_FORCED_RMMOD 3 340 #define TAINT_MACHINE_CHECK 4 341 #define TAINT_BAD_PAGE 5 342 #define TAINT_USER 6 343 #define TAINT_DIE 7 344 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 345 #define TAINT_WARN 9 346 #define TAINT_CRAP 10 347 348 extern void dump_stack(void) __cold; 349 350 enum { 351 DUMP_PREFIX_NONE, 352 DUMP_PREFIX_ADDRESS, 353 DUMP_PREFIX_OFFSET 354 }; 355 extern void hex_dump_to_buffer(const void *buf, size_t len, 356 int rowsize, int groupsize, 357 char *linebuf, size_t linebuflen, bool ascii); 358 extern void print_hex_dump(const char *level, const char *prefix_str, 359 int prefix_type, int rowsize, int groupsize, 360 const void *buf, size_t len, bool ascii); 361 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 362 const void *buf, size_t len); 363 364 extern const char hex_asc[]; 365 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 366 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 367 368 static inline char *pack_hex_byte(char *buf, u8 byte) 369 { 370 *buf++ = hex_asc_hi(byte); 371 *buf++ = hex_asc_lo(byte); 372 return buf; 373 } 374 375 #ifndef pr_fmt 376 #define pr_fmt(fmt) fmt 377 #endif 378 379 #define pr_emerg(fmt, ...) \ 380 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 381 #define pr_alert(fmt, ...) \ 382 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 383 #define pr_crit(fmt, ...) \ 384 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 385 #define pr_err(fmt, ...) \ 386 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 387 #define pr_warning(fmt, ...) \ 388 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 389 #define pr_notice(fmt, ...) \ 390 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 391 #define pr_info(fmt, ...) \ 392 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 393 #define pr_cont(fmt, ...) \ 394 printk(KERN_CONT fmt, ##__VA_ARGS__) 395 396 /* pr_devel() should produce zero code unless DEBUG is defined */ 397 #ifdef DEBUG 398 #define pr_devel(fmt, ...) \ 399 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 400 #else 401 #define pr_devel(fmt, ...) \ 402 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 403 #endif 404 405 /* If you are writing a driver, please use dev_dbg instead */ 406 #if defined(DEBUG) 407 #define pr_debug(fmt, ...) \ 408 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 409 #elif defined(CONFIG_DYNAMIC_DEBUG) 410 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 411 #define pr_debug(fmt, ...) \ 412 dynamic_pr_debug(fmt, ##__VA_ARGS__) 413 #else 414 #define pr_debug(fmt, ...) \ 415 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 416 #endif 417 418 /* 419 * ratelimited messages with local ratelimit_state, 420 * no local ratelimit_state used in the !PRINTK case 421 */ 422 #ifdef CONFIG_PRINTK 423 #define printk_ratelimited(fmt, ...) ({ \ 424 static struct ratelimit_state _rs = { \ 425 .interval = DEFAULT_RATELIMIT_INTERVAL, \ 426 .burst = DEFAULT_RATELIMIT_BURST, \ 427 }; \ 428 \ 429 if (!__ratelimit(&_rs)) \ 430 printk(fmt, ##__VA_ARGS__); \ 431 }) 432 #else 433 /* No effect, but we still get type checking even in the !PRINTK case: */ 434 #define printk_ratelimited printk 435 #endif 436 437 #define pr_emerg_ratelimited(fmt, ...) \ 438 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 439 #define pr_alert_ratelimited(fmt, ...) \ 440 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 441 #define pr_crit_ratelimited(fmt, ...) \ 442 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 443 #define pr_err_ratelimited(fmt, ...) \ 444 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 445 #define pr_warning_ratelimited(fmt, ...) \ 446 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 447 #define pr_notice_ratelimited(fmt, ...) \ 448 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 449 #define pr_info_ratelimited(fmt, ...) \ 450 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 451 /* no pr_cont_ratelimited, don't do that... */ 452 /* If you are writing a driver, please use dev_dbg instead */ 453 #if defined(DEBUG) 454 #define pr_debug_ratelimited(fmt, ...) \ 455 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 456 #else 457 #define pr_debug_ratelimited(fmt, ...) \ 458 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ 459 ##__VA_ARGS__); 0; }) 460 #endif 461 462 /* 463 * General tracing related utility functions - trace_printk(), 464 * tracing_on/tracing_off and tracing_start()/tracing_stop 465 * 466 * Use tracing_on/tracing_off when you want to quickly turn on or off 467 * tracing. It simply enables or disables the recording of the trace events. 468 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 469 * file, which gives a means for the kernel and userspace to interact. 470 * Place a tracing_off() in the kernel where you want tracing to end. 471 * From user space, examine the trace, and then echo 1 > tracing_on 472 * to continue tracing. 473 * 474 * tracing_stop/tracing_start has slightly more overhead. It is used 475 * by things like suspend to ram where disabling the recording of the 476 * trace is not enough, but tracing must actually stop because things 477 * like calling smp_processor_id() may crash the system. 478 * 479 * Most likely, you want to use tracing_on/tracing_off. 480 */ 481 #ifdef CONFIG_RING_BUFFER 482 void tracing_on(void); 483 void tracing_off(void); 484 /* trace_off_permanent stops recording with no way to bring it back */ 485 void tracing_off_permanent(void); 486 int tracing_is_on(void); 487 #else 488 static inline void tracing_on(void) { } 489 static inline void tracing_off(void) { } 490 static inline void tracing_off_permanent(void) { } 491 static inline int tracing_is_on(void) { return 0; } 492 #endif 493 #ifdef CONFIG_TRACING 494 extern void tracing_start(void); 495 extern void tracing_stop(void); 496 extern void ftrace_off_permanent(void); 497 498 extern void 499 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); 500 501 static inline void __attribute__ ((format (printf, 1, 2))) 502 ____trace_printk_check_format(const char *fmt, ...) 503 { 504 } 505 #define __trace_printk_check_format(fmt, args...) \ 506 do { \ 507 if (0) \ 508 ____trace_printk_check_format(fmt, ##args); \ 509 } while (0) 510 511 /** 512 * trace_printk - printf formatting in the ftrace buffer 513 * @fmt: the printf format for printing 514 * 515 * Note: __trace_printk is an internal function for trace_printk and 516 * the @ip is passed in via the trace_printk macro. 517 * 518 * This function allows a kernel developer to debug fast path sections 519 * that printk is not appropriate for. By scattering in various 520 * printk like tracing in the code, a developer can quickly see 521 * where problems are occurring. 522 * 523 * This is intended as a debugging tool for the developer only. 524 * Please refrain from leaving trace_printks scattered around in 525 * your code. 526 */ 527 528 #define trace_printk(fmt, args...) \ 529 do { \ 530 __trace_printk_check_format(fmt, ##args); \ 531 if (__builtin_constant_p(fmt)) { \ 532 static const char *trace_printk_fmt \ 533 __attribute__((section("__trace_printk_fmt"))) = \ 534 __builtin_constant_p(fmt) ? fmt : NULL; \ 535 \ 536 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 537 } else \ 538 __trace_printk(_THIS_IP_, fmt, ##args); \ 539 } while (0) 540 541 extern int 542 __trace_bprintk(unsigned long ip, const char *fmt, ...) 543 __attribute__ ((format (printf, 2, 3))); 544 545 extern int 546 __trace_printk(unsigned long ip, const char *fmt, ...) 547 __attribute__ ((format (printf, 2, 3))); 548 549 extern void trace_dump_stack(void); 550 551 /* 552 * The double __builtin_constant_p is because gcc will give us an error 553 * if we try to allocate the static variable to fmt if it is not a 554 * constant. Even with the outer if statement. 555 */ 556 #define ftrace_vprintk(fmt, vargs) \ 557 do { \ 558 if (__builtin_constant_p(fmt)) { \ 559 static const char *trace_printk_fmt \ 560 __attribute__((section("__trace_printk_fmt"))) = \ 561 __builtin_constant_p(fmt) ? fmt : NULL; \ 562 \ 563 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 564 } else \ 565 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 566 } while (0) 567 568 extern int 569 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 570 571 extern int 572 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 573 574 extern void ftrace_dump(void); 575 #else 576 static inline void 577 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } 578 static inline int 579 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 580 581 static inline void tracing_start(void) { } 582 static inline void tracing_stop(void) { } 583 static inline void ftrace_off_permanent(void) { } 584 static inline void trace_dump_stack(void) { } 585 static inline int 586 trace_printk(const char *fmt, ...) 587 { 588 return 0; 589 } 590 static inline int 591 ftrace_vprintk(const char *fmt, va_list ap) 592 { 593 return 0; 594 } 595 static inline void ftrace_dump(void) { } 596 #endif /* CONFIG_TRACING */ 597 598 /* 599 * Display an IP address in readable format. 600 */ 601 602 #define NIPQUAD(addr) \ 603 ((unsigned char *)&addr)[0], \ 604 ((unsigned char *)&addr)[1], \ 605 ((unsigned char *)&addr)[2], \ 606 ((unsigned char *)&addr)[3] 607 #define NIPQUAD_FMT "%u.%u.%u.%u" 608 609 /* 610 * min()/max()/clamp() macros that also do 611 * strict type-checking.. See the 612 * "unnecessary" pointer comparison. 613 */ 614 #define min(x, y) ({ \ 615 typeof(x) _min1 = (x); \ 616 typeof(y) _min2 = (y); \ 617 (void) (&_min1 == &_min2); \ 618 _min1 < _min2 ? _min1 : _min2; }) 619 620 #define max(x, y) ({ \ 621 typeof(x) _max1 = (x); \ 622 typeof(y) _max2 = (y); \ 623 (void) (&_max1 == &_max2); \ 624 _max1 > _max2 ? _max1 : _max2; }) 625 626 /** 627 * clamp - return a value clamped to a given range with strict typechecking 628 * @val: current value 629 * @min: minimum allowable value 630 * @max: maximum allowable value 631 * 632 * This macro does strict typechecking of min/max to make sure they are of the 633 * same type as val. See the unnecessary pointer comparisons. 634 */ 635 #define clamp(val, min, max) ({ \ 636 typeof(val) __val = (val); \ 637 typeof(min) __min = (min); \ 638 typeof(max) __max = (max); \ 639 (void) (&__val == &__min); \ 640 (void) (&__val == &__max); \ 641 __val = __val < __min ? __min: __val; \ 642 __val > __max ? __max: __val; }) 643 644 /* 645 * ..and if you can't take the strict 646 * types, you can specify one yourself. 647 * 648 * Or not use min/max/clamp at all, of course. 649 */ 650 #define min_t(type, x, y) ({ \ 651 type __min1 = (x); \ 652 type __min2 = (y); \ 653 __min1 < __min2 ? __min1: __min2; }) 654 655 #define max_t(type, x, y) ({ \ 656 type __max1 = (x); \ 657 type __max2 = (y); \ 658 __max1 > __max2 ? __max1: __max2; }) 659 660 /** 661 * clamp_t - return a value clamped to a given range using a given type 662 * @type: the type of variable to use 663 * @val: current value 664 * @min: minimum allowable value 665 * @max: maximum allowable value 666 * 667 * This macro does no typechecking and uses temporary variables of type 668 * 'type' to make all the comparisons. 669 */ 670 #define clamp_t(type, val, min, max) ({ \ 671 type __val = (val); \ 672 type __min = (min); \ 673 type __max = (max); \ 674 __val = __val < __min ? __min: __val; \ 675 __val > __max ? __max: __val; }) 676 677 /** 678 * clamp_val - return a value clamped to a given range using val's type 679 * @val: current value 680 * @min: minimum allowable value 681 * @max: maximum allowable value 682 * 683 * This macro does no typechecking and uses temporary variables of whatever 684 * type the input argument 'val' is. This is useful when val is an unsigned 685 * type and min and max are literals that will otherwise be assigned a signed 686 * integer type. 687 */ 688 #define clamp_val(val, min, max) ({ \ 689 typeof(val) __val = (val); \ 690 typeof(val) __min = (min); \ 691 typeof(val) __max = (max); \ 692 __val = __val < __min ? __min: __val; \ 693 __val > __max ? __max: __val; }) 694 695 696 /* 697 * swap - swap value of @a and @b 698 */ 699 #define swap(a, b) \ 700 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 701 702 /** 703 * container_of - cast a member of a structure out to the containing structure 704 * @ptr: the pointer to the member. 705 * @type: the type of the container struct this is embedded in. 706 * @member: the name of the member within the struct. 707 * 708 */ 709 #define container_of(ptr, type, member) ({ \ 710 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 711 (type *)( (char *)__mptr - offsetof(type,member) );}) 712 713 struct sysinfo; 714 extern int do_sysinfo(struct sysinfo *info); 715 716 #endif /* __KERNEL__ */ 717 718 #ifndef __EXPORTED_HEADERS__ 719 #ifndef __KERNEL__ 720 #warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders 721 #endif /* __KERNEL__ */ 722 #endif /* __EXPORTED_HEADERS__ */ 723 724 #define SI_LOAD_SHIFT 16 725 struct sysinfo { 726 long uptime; /* Seconds since boot */ 727 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 728 unsigned long totalram; /* Total usable main memory size */ 729 unsigned long freeram; /* Available memory size */ 730 unsigned long sharedram; /* Amount of shared memory */ 731 unsigned long bufferram; /* Memory used by buffers */ 732 unsigned long totalswap; /* Total swap space size */ 733 unsigned long freeswap; /* swap space still available */ 734 unsigned short procs; /* Number of current processes */ 735 unsigned short pad; /* explicit padding for m68k */ 736 unsigned long totalhigh; /* Total high memory size */ 737 unsigned long freehigh; /* Available high memory size */ 738 unsigned int mem_unit; /* Memory unit size in bytes */ 739 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 740 }; 741 742 /* Force a compilation error if condition is true */ 743 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 744 745 /* Force a compilation error if condition is constant and true */ 746 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 747 748 /* Force a compilation error if a constant expression is not a power of 2 */ 749 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 750 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 751 752 /* Force a compilation error if condition is true, but also produce a 753 result (of value 0 and type size_t), so the expression can be used 754 e.g. in a structure initializer (or where-ever else comma expressions 755 aren't permitted). */ 756 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 757 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 758 759 /* Trap pasters of __FUNCTION__ at compile-time */ 760 #define __FUNCTION__ (__func__) 761 762 /* This helps us to avoid #ifdef CONFIG_NUMA */ 763 #ifdef CONFIG_NUMA 764 #define NUMA_BUILD 1 765 #else 766 #define NUMA_BUILD 0 767 #endif 768 769 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 770 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 771 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 772 #endif 773 774 #endif 775