1 #ifndef _LINUX_KERNEL_H 2 #define _LINUX_KERNEL_H 3 4 /* 5 * 'kernel.h' contains some often-used function prototypes etc 6 */ 7 #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) 8 #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 9 10 #ifdef __KERNEL__ 11 12 #include <stdarg.h> 13 #include <linux/linkage.h> 14 #include <linux/stddef.h> 15 #include <linux/types.h> 16 #include <linux/compiler.h> 17 #include <linux/bitops.h> 18 #include <linux/log2.h> 19 #include <linux/typecheck.h> 20 #include <linux/dynamic_debug.h> 21 #include <asm/byteorder.h> 22 #include <asm/bug.h> 23 24 extern const char linux_banner[]; 25 extern const char linux_proc_banner[]; 26 27 #define USHRT_MAX ((u16)(~0U)) 28 #define SHRT_MAX ((s16)(USHRT_MAX>>1)) 29 #define SHRT_MIN ((s16)(-SHRT_MAX - 1)) 30 #define INT_MAX ((int)(~0U>>1)) 31 #define INT_MIN (-INT_MAX - 1) 32 #define UINT_MAX (~0U) 33 #define LONG_MAX ((long)(~0UL>>1)) 34 #define LONG_MIN (-LONG_MAX - 1) 35 #define ULONG_MAX (~0UL) 36 #define LLONG_MAX ((long long)(~0ULL>>1)) 37 #define LLONG_MIN (-LLONG_MAX - 1) 38 #define ULLONG_MAX (~0ULL) 39 40 #define STACK_MAGIC 0xdeadbeef 41 42 #define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) 43 #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) 44 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) 45 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) 46 47 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 48 49 /* 50 * This looks more complex than it should be. But we need to 51 * get the type for the ~ right in round_down (it needs to be 52 * as wide as the result!), and we want to evaluate the macro 53 * arguments just once each. 54 */ 55 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 56 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 57 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 58 59 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 60 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 61 #define roundup(x, y) ( \ 62 { \ 63 typeof(y) __y = y; \ 64 (((x) + (__y - 1)) / __y) * __y; \ 65 } \ 66 ) 67 #define rounddown(x, y) ( \ 68 { \ 69 typeof(x) __x = (x); \ 70 __x - (__x % (y)); \ 71 } \ 72 ) 73 #define DIV_ROUND_CLOSEST(x, divisor)( \ 74 { \ 75 typeof(divisor) __divisor = divisor; \ 76 (((x) + ((__divisor) / 2)) / (__divisor)); \ 77 } \ 78 ) 79 80 #define _RET_IP_ (unsigned long)__builtin_return_address(0) 81 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) 82 83 #ifdef CONFIG_LBDAF 84 # include <asm/div64.h> 85 # define sector_div(a, b) do_div(a, b) 86 #else 87 # define sector_div(n, b)( \ 88 { \ 89 int _res; \ 90 _res = (n) % (b); \ 91 (n) /= (b); \ 92 _res; \ 93 } \ 94 ) 95 #endif 96 97 /** 98 * upper_32_bits - return bits 32-63 of a number 99 * @n: the number we're accessing 100 * 101 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress 102 * the "right shift count >= width of type" warning when that quantity is 103 * 32-bits. 104 */ 105 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 106 107 /** 108 * lower_32_bits - return bits 0-31 of a number 109 * @n: the number we're accessing 110 */ 111 #define lower_32_bits(n) ((u32)(n)) 112 113 #define KERN_EMERG "<0>" /* system is unusable */ 114 #define KERN_ALERT "<1>" /* action must be taken immediately */ 115 #define KERN_CRIT "<2>" /* critical conditions */ 116 #define KERN_ERR "<3>" /* error conditions */ 117 #define KERN_WARNING "<4>" /* warning conditions */ 118 #define KERN_NOTICE "<5>" /* normal but significant condition */ 119 #define KERN_INFO "<6>" /* informational */ 120 #define KERN_DEBUG "<7>" /* debug-level messages */ 121 122 /* Use the default kernel loglevel */ 123 #define KERN_DEFAULT "<d>" 124 /* 125 * Annotation for a "continued" line of log printout (only done after a 126 * line that had no enclosing \n). Only to be used by core/arch code 127 * during early bootup (a continued line is not SMP-safe otherwise). 128 */ 129 #define KERN_CONT "<c>" 130 131 extern int console_printk[]; 132 133 #define console_loglevel (console_printk[0]) 134 #define default_message_loglevel (console_printk[1]) 135 #define minimum_console_loglevel (console_printk[2]) 136 #define default_console_loglevel (console_printk[3]) 137 138 struct completion; 139 struct pt_regs; 140 struct user; 141 142 #ifdef CONFIG_PREEMPT_VOLUNTARY 143 extern int _cond_resched(void); 144 # define might_resched() _cond_resched() 145 #else 146 # define might_resched() do { } while (0) 147 #endif 148 149 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 150 void __might_sleep(const char *file, int line, int preempt_offset); 151 /** 152 * might_sleep - annotation for functions that can sleep 153 * 154 * this macro will print a stack trace if it is executed in an atomic 155 * context (spinlock, irq-handler, ...). 156 * 157 * This is a useful debugging help to be able to catch problems early and not 158 * be bitten later when the calling function happens to sleep when it is not 159 * supposed to. 160 */ 161 # define might_sleep() \ 162 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) 163 #else 164 static inline void __might_sleep(const char *file, int line, 165 int preempt_offset) { } 166 # define might_sleep() do { might_resched(); } while (0) 167 #endif 168 169 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 170 171 #define abs(x) ({ \ 172 long __x = (x); \ 173 (__x < 0) ? -__x : __x; \ 174 }) 175 176 #ifdef CONFIG_PROVE_LOCKING 177 void might_fault(void); 178 #else 179 static inline void might_fault(void) 180 { 181 might_sleep(); 182 } 183 #endif 184 185 struct va_format { 186 const char *fmt; 187 va_list *va; 188 }; 189 190 extern struct atomic_notifier_head panic_notifier_list; 191 extern long (*panic_blink)(int state); 192 NORET_TYPE void panic(const char * fmt, ...) 193 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; 194 extern void oops_enter(void); 195 extern void oops_exit(void); 196 void print_oops_end_marker(void); 197 extern int oops_may_print(void); 198 NORET_TYPE void do_exit(long error_code) 199 ATTRIB_NORET; 200 NORET_TYPE void complete_and_exit(struct completion *, long) 201 ATTRIB_NORET; 202 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 203 extern long simple_strtol(const char *,char **,unsigned int); 204 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 205 extern long long simple_strtoll(const char *,char **,unsigned int); 206 extern int strict_strtoul(const char *, unsigned int, unsigned long *); 207 extern int strict_strtol(const char *, unsigned int, long *); 208 extern int strict_strtoull(const char *, unsigned int, unsigned long long *); 209 extern int strict_strtoll(const char *, unsigned int, long long *); 210 extern int sprintf(char * buf, const char * fmt, ...) 211 __attribute__ ((format (printf, 2, 3))); 212 extern int vsprintf(char *buf, const char *, va_list) 213 __attribute__ ((format (printf, 2, 0))); 214 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 215 __attribute__ ((format (printf, 3, 4))); 216 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 217 __attribute__ ((format (printf, 3, 0))); 218 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 219 __attribute__ ((format (printf, 3, 4))); 220 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 221 __attribute__ ((format (printf, 3, 0))); 222 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 223 __attribute__ ((format (printf, 2, 3))); 224 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 225 226 extern int sscanf(const char *, const char *, ...) 227 __attribute__ ((format (scanf, 2, 3))); 228 extern int vsscanf(const char *, const char *, va_list) 229 __attribute__ ((format (scanf, 2, 0))); 230 231 extern int get_option(char **str, int *pint); 232 extern char *get_options(const char *str, int nints, int *ints); 233 extern unsigned long long memparse(const char *ptr, char **retptr); 234 235 extern int core_kernel_text(unsigned long addr); 236 extern int __kernel_text_address(unsigned long addr); 237 extern int kernel_text_address(unsigned long addr); 238 extern int func_ptr_is_kernel_text(void *ptr); 239 240 struct pid; 241 extern struct pid *session_of_pgrp(struct pid *pgrp); 242 243 /* 244 * FW_BUG 245 * Add this to a message where you are sure the firmware is buggy or behaves 246 * really stupid or out of spec. Be aware that the responsible BIOS developer 247 * should be able to fix this issue or at least get a concrete idea of the 248 * problem by reading your message without the need of looking at the kernel 249 * code. 250 * 251 * Use it for definite and high priority BIOS bugs. 252 * 253 * FW_WARN 254 * Use it for not that clear (e.g. could the kernel messed up things already?) 255 * and medium priority BIOS bugs. 256 * 257 * FW_INFO 258 * Use this one if you want to tell the user or vendor about something 259 * suspicious, but generally harmless related to the firmware. 260 * 261 * Use it for information or very low priority BIOS bugs. 262 */ 263 #define FW_BUG "[Firmware Bug]: " 264 #define FW_WARN "[Firmware Warn]: " 265 #define FW_INFO "[Firmware Info]: " 266 267 /* 268 * HW_ERR 269 * Add this to a message for hardware errors, so that user can report 270 * it to hardware vendor instead of LKML or software vendor. 271 */ 272 #define HW_ERR "[Hardware Error]: " 273 274 #ifdef CONFIG_PRINTK 275 asmlinkage int vprintk(const char *fmt, va_list args) 276 __attribute__ ((format (printf, 1, 0))); 277 asmlinkage int printk(const char * fmt, ...) 278 __attribute__ ((format (printf, 1, 2))) __cold; 279 280 extern int __printk_ratelimit(const char *func); 281 #define printk_ratelimit() __printk_ratelimit(__func__) 282 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 283 unsigned int interval_msec); 284 285 extern int printk_delay_msec; 286 287 /* 288 * Print a one-time message (analogous to WARN_ONCE() et al): 289 */ 290 #define printk_once(x...) ({ \ 291 static bool __print_once; \ 292 \ 293 if (!__print_once) { \ 294 __print_once = true; \ 295 printk(x); \ 296 } \ 297 }) 298 299 void log_buf_kexec_setup(void); 300 #else 301 static inline int vprintk(const char *s, va_list args) 302 __attribute__ ((format (printf, 1, 0))); 303 static inline int vprintk(const char *s, va_list args) { return 0; } 304 static inline int printk(const char *s, ...) 305 __attribute__ ((format (printf, 1, 2))); 306 static inline int __cold printk(const char *s, ...) { return 0; } 307 static inline int printk_ratelimit(void) { return 0; } 308 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ 309 unsigned int interval_msec) \ 310 { return false; } 311 312 /* No effect, but we still get type checking even in the !PRINTK case: */ 313 #define printk_once(x...) printk(x) 314 315 static inline void log_buf_kexec_setup(void) 316 { 317 } 318 #endif 319 320 /* 321 * Dummy printk for disabled debugging statements to use whilst maintaining 322 * gcc's format and side-effect checking. 323 */ 324 static inline __attribute__ ((format (printf, 1, 2))) 325 int no_printk(const char *s, ...) { return 0; } 326 327 extern int printk_needs_cpu(int cpu); 328 extern void printk_tick(void); 329 330 extern void asmlinkage __attribute__((format(printf, 1, 2))) 331 early_printk(const char *fmt, ...); 332 333 unsigned long int_sqrt(unsigned long); 334 335 static inline void console_silent(void) 336 { 337 console_loglevel = 0; 338 } 339 340 static inline void console_verbose(void) 341 { 342 if (console_loglevel) 343 console_loglevel = 15; 344 } 345 346 extern void bust_spinlocks(int yes); 347 extern void wake_up_klogd(void); 348 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 349 extern int panic_timeout; 350 extern int panic_on_oops; 351 extern int panic_on_unrecovered_nmi; 352 extern int panic_on_io_nmi; 353 extern const char *print_tainted(void); 354 extern void add_taint(unsigned flag); 355 extern int test_taint(unsigned flag); 356 extern unsigned long get_taint(void); 357 extern int root_mountflags; 358 359 /* Values used for system_state */ 360 extern enum system_states { 361 SYSTEM_BOOTING, 362 SYSTEM_RUNNING, 363 SYSTEM_HALT, 364 SYSTEM_POWER_OFF, 365 SYSTEM_RESTART, 366 SYSTEM_SUSPEND_DISK, 367 } system_state; 368 369 #define TAINT_PROPRIETARY_MODULE 0 370 #define TAINT_FORCED_MODULE 1 371 #define TAINT_UNSAFE_SMP 2 372 #define TAINT_FORCED_RMMOD 3 373 #define TAINT_MACHINE_CHECK 4 374 #define TAINT_BAD_PAGE 5 375 #define TAINT_USER 6 376 #define TAINT_DIE 7 377 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 378 #define TAINT_WARN 9 379 #define TAINT_CRAP 10 380 #define TAINT_FIRMWARE_WORKAROUND 11 381 382 extern void dump_stack(void) __cold; 383 384 enum { 385 DUMP_PREFIX_NONE, 386 DUMP_PREFIX_ADDRESS, 387 DUMP_PREFIX_OFFSET 388 }; 389 extern void hex_dump_to_buffer(const void *buf, size_t len, 390 int rowsize, int groupsize, 391 char *linebuf, size_t linebuflen, bool ascii); 392 extern void print_hex_dump(const char *level, const char *prefix_str, 393 int prefix_type, int rowsize, int groupsize, 394 const void *buf, size_t len, bool ascii); 395 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 396 const void *buf, size_t len); 397 398 extern const char hex_asc[]; 399 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 400 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 401 402 static inline char *pack_hex_byte(char *buf, u8 byte) 403 { 404 *buf++ = hex_asc_hi(byte); 405 *buf++ = hex_asc_lo(byte); 406 return buf; 407 } 408 409 extern int hex_to_bin(char ch); 410 411 #ifndef pr_fmt 412 #define pr_fmt(fmt) fmt 413 #endif 414 415 #define pr_emerg(fmt, ...) \ 416 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 417 #define pr_alert(fmt, ...) \ 418 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 419 #define pr_crit(fmt, ...) \ 420 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 421 #define pr_err(fmt, ...) \ 422 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 423 #define pr_warning(fmt, ...) \ 424 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 425 #define pr_warn pr_warning 426 #define pr_notice(fmt, ...) \ 427 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 428 #define pr_info(fmt, ...) \ 429 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 430 #define pr_cont(fmt, ...) \ 431 printk(KERN_CONT fmt, ##__VA_ARGS__) 432 433 /* pr_devel() should produce zero code unless DEBUG is defined */ 434 #ifdef DEBUG 435 #define pr_devel(fmt, ...) \ 436 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 437 #else 438 #define pr_devel(fmt, ...) \ 439 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 440 #endif 441 442 /* If you are writing a driver, please use dev_dbg instead */ 443 #if defined(DEBUG) 444 #define pr_debug(fmt, ...) \ 445 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 446 #elif defined(CONFIG_DYNAMIC_DEBUG) 447 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 448 #define pr_debug(fmt, ...) \ 449 dynamic_pr_debug(fmt, ##__VA_ARGS__) 450 #else 451 #define pr_debug(fmt, ...) \ 452 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) 453 #endif 454 455 /* 456 * ratelimited messages with local ratelimit_state, 457 * no local ratelimit_state used in the !PRINTK case 458 */ 459 #ifdef CONFIG_PRINTK 460 #define printk_ratelimited(fmt, ...) ({ \ 461 static DEFINE_RATELIMIT_STATE(_rs, \ 462 DEFAULT_RATELIMIT_INTERVAL, \ 463 DEFAULT_RATELIMIT_BURST); \ 464 \ 465 if (__ratelimit(&_rs)) \ 466 printk(fmt, ##__VA_ARGS__); \ 467 }) 468 #else 469 /* No effect, but we still get type checking even in the !PRINTK case: */ 470 #define printk_ratelimited printk 471 #endif 472 473 #define pr_emerg_ratelimited(fmt, ...) \ 474 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 475 #define pr_alert_ratelimited(fmt, ...) \ 476 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 477 #define pr_crit_ratelimited(fmt, ...) \ 478 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 479 #define pr_err_ratelimited(fmt, ...) \ 480 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 481 #define pr_warning_ratelimited(fmt, ...) \ 482 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 483 #define pr_warn_ratelimited pr_warning_ratelimited 484 #define pr_notice_ratelimited(fmt, ...) \ 485 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 486 #define pr_info_ratelimited(fmt, ...) \ 487 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 488 /* no pr_cont_ratelimited, don't do that... */ 489 /* If you are writing a driver, please use dev_dbg instead */ 490 #if defined(DEBUG) 491 #define pr_debug_ratelimited(fmt, ...) \ 492 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 493 #else 494 #define pr_debug_ratelimited(fmt, ...) \ 495 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \ 496 ##__VA_ARGS__); 0; }) 497 #endif 498 499 /* 500 * General tracing related utility functions - trace_printk(), 501 * tracing_on/tracing_off and tracing_start()/tracing_stop 502 * 503 * Use tracing_on/tracing_off when you want to quickly turn on or off 504 * tracing. It simply enables or disables the recording of the trace events. 505 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on 506 * file, which gives a means for the kernel and userspace to interact. 507 * Place a tracing_off() in the kernel where you want tracing to end. 508 * From user space, examine the trace, and then echo 1 > tracing_on 509 * to continue tracing. 510 * 511 * tracing_stop/tracing_start has slightly more overhead. It is used 512 * by things like suspend to ram where disabling the recording of the 513 * trace is not enough, but tracing must actually stop because things 514 * like calling smp_processor_id() may crash the system. 515 * 516 * Most likely, you want to use tracing_on/tracing_off. 517 */ 518 #ifdef CONFIG_RING_BUFFER 519 void tracing_on(void); 520 void tracing_off(void); 521 /* trace_off_permanent stops recording with no way to bring it back */ 522 void tracing_off_permanent(void); 523 int tracing_is_on(void); 524 #else 525 static inline void tracing_on(void) { } 526 static inline void tracing_off(void) { } 527 static inline void tracing_off_permanent(void) { } 528 static inline int tracing_is_on(void) { return 0; } 529 #endif 530 531 enum ftrace_dump_mode { 532 DUMP_NONE, 533 DUMP_ALL, 534 DUMP_ORIG, 535 }; 536 537 #ifdef CONFIG_TRACING 538 extern void tracing_start(void); 539 extern void tracing_stop(void); 540 extern void ftrace_off_permanent(void); 541 542 static inline void __attribute__ ((format (printf, 1, 2))) 543 ____trace_printk_check_format(const char *fmt, ...) 544 { 545 } 546 #define __trace_printk_check_format(fmt, args...) \ 547 do { \ 548 if (0) \ 549 ____trace_printk_check_format(fmt, ##args); \ 550 } while (0) 551 552 /** 553 * trace_printk - printf formatting in the ftrace buffer 554 * @fmt: the printf format for printing 555 * 556 * Note: __trace_printk is an internal function for trace_printk and 557 * the @ip is passed in via the trace_printk macro. 558 * 559 * This function allows a kernel developer to debug fast path sections 560 * that printk is not appropriate for. By scattering in various 561 * printk like tracing in the code, a developer can quickly see 562 * where problems are occurring. 563 * 564 * This is intended as a debugging tool for the developer only. 565 * Please refrain from leaving trace_printks scattered around in 566 * your code. 567 */ 568 569 #define trace_printk(fmt, args...) \ 570 do { \ 571 __trace_printk_check_format(fmt, ##args); \ 572 if (__builtin_constant_p(fmt)) { \ 573 static const char *trace_printk_fmt \ 574 __attribute__((section("__trace_printk_fmt"))) = \ 575 __builtin_constant_p(fmt) ? fmt : NULL; \ 576 \ 577 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ 578 } else \ 579 __trace_printk(_THIS_IP_, fmt, ##args); \ 580 } while (0) 581 582 extern int 583 __trace_bprintk(unsigned long ip, const char *fmt, ...) 584 __attribute__ ((format (printf, 2, 3))); 585 586 extern int 587 __trace_printk(unsigned long ip, const char *fmt, ...) 588 __attribute__ ((format (printf, 2, 3))); 589 590 extern void trace_dump_stack(void); 591 592 /* 593 * The double __builtin_constant_p is because gcc will give us an error 594 * if we try to allocate the static variable to fmt if it is not a 595 * constant. Even with the outer if statement. 596 */ 597 #define ftrace_vprintk(fmt, vargs) \ 598 do { \ 599 if (__builtin_constant_p(fmt)) { \ 600 static const char *trace_printk_fmt \ 601 __attribute__((section("__trace_printk_fmt"))) = \ 602 __builtin_constant_p(fmt) ? fmt : NULL; \ 603 \ 604 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ 605 } else \ 606 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ 607 } while (0) 608 609 extern int 610 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); 611 612 extern int 613 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); 614 615 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); 616 #else 617 static inline int 618 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); 619 620 static inline void tracing_start(void) { } 621 static inline void tracing_stop(void) { } 622 static inline void ftrace_off_permanent(void) { } 623 static inline void trace_dump_stack(void) { } 624 static inline int 625 trace_printk(const char *fmt, ...) 626 { 627 return 0; 628 } 629 static inline int 630 ftrace_vprintk(const char *fmt, va_list ap) 631 { 632 return 0; 633 } 634 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } 635 #endif /* CONFIG_TRACING */ 636 637 /* 638 * min()/max()/clamp() macros that also do 639 * strict type-checking.. See the 640 * "unnecessary" pointer comparison. 641 */ 642 #define min(x, y) ({ \ 643 typeof(x) _min1 = (x); \ 644 typeof(y) _min2 = (y); \ 645 (void) (&_min1 == &_min2); \ 646 _min1 < _min2 ? _min1 : _min2; }) 647 648 #define max(x, y) ({ \ 649 typeof(x) _max1 = (x); \ 650 typeof(y) _max2 = (y); \ 651 (void) (&_max1 == &_max2); \ 652 _max1 > _max2 ? _max1 : _max2; }) 653 654 /** 655 * clamp - return a value clamped to a given range with strict typechecking 656 * @val: current value 657 * @min: minimum allowable value 658 * @max: maximum allowable value 659 * 660 * This macro does strict typechecking of min/max to make sure they are of the 661 * same type as val. See the unnecessary pointer comparisons. 662 */ 663 #define clamp(val, min, max) ({ \ 664 typeof(val) __val = (val); \ 665 typeof(min) __min = (min); \ 666 typeof(max) __max = (max); \ 667 (void) (&__val == &__min); \ 668 (void) (&__val == &__max); \ 669 __val = __val < __min ? __min: __val; \ 670 __val > __max ? __max: __val; }) 671 672 /* 673 * ..and if you can't take the strict 674 * types, you can specify one yourself. 675 * 676 * Or not use min/max/clamp at all, of course. 677 */ 678 #define min_t(type, x, y) ({ \ 679 type __min1 = (x); \ 680 type __min2 = (y); \ 681 __min1 < __min2 ? __min1: __min2; }) 682 683 #define max_t(type, x, y) ({ \ 684 type __max1 = (x); \ 685 type __max2 = (y); \ 686 __max1 > __max2 ? __max1: __max2; }) 687 688 /** 689 * clamp_t - return a value clamped to a given range using a given type 690 * @type: the type of variable to use 691 * @val: current value 692 * @min: minimum allowable value 693 * @max: maximum allowable value 694 * 695 * This macro does no typechecking and uses temporary variables of type 696 * 'type' to make all the comparisons. 697 */ 698 #define clamp_t(type, val, min, max) ({ \ 699 type __val = (val); \ 700 type __min = (min); \ 701 type __max = (max); \ 702 __val = __val < __min ? __min: __val; \ 703 __val > __max ? __max: __val; }) 704 705 /** 706 * clamp_val - return a value clamped to a given range using val's type 707 * @val: current value 708 * @min: minimum allowable value 709 * @max: maximum allowable value 710 * 711 * This macro does no typechecking and uses temporary variables of whatever 712 * type the input argument 'val' is. This is useful when val is an unsigned 713 * type and min and max are literals that will otherwise be assigned a signed 714 * integer type. 715 */ 716 #define clamp_val(val, min, max) ({ \ 717 typeof(val) __val = (val); \ 718 typeof(val) __min = (min); \ 719 typeof(val) __max = (max); \ 720 __val = __val < __min ? __min: __val; \ 721 __val > __max ? __max: __val; }) 722 723 724 /* 725 * swap - swap value of @a and @b 726 */ 727 #define swap(a, b) \ 728 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) 729 730 /** 731 * container_of - cast a member of a structure out to the containing structure 732 * @ptr: the pointer to the member. 733 * @type: the type of the container struct this is embedded in. 734 * @member: the name of the member within the struct. 735 * 736 */ 737 #define container_of(ptr, type, member) ({ \ 738 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 739 (type *)( (char *)__mptr - offsetof(type,member) );}) 740 741 struct sysinfo; 742 extern int do_sysinfo(struct sysinfo *info); 743 744 #endif /* __KERNEL__ */ 745 746 #define SI_LOAD_SHIFT 16 747 struct sysinfo { 748 long uptime; /* Seconds since boot */ 749 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 750 unsigned long totalram; /* Total usable main memory size */ 751 unsigned long freeram; /* Available memory size */ 752 unsigned long sharedram; /* Amount of shared memory */ 753 unsigned long bufferram; /* Memory used by buffers */ 754 unsigned long totalswap; /* Total swap space size */ 755 unsigned long freeswap; /* swap space still available */ 756 unsigned short procs; /* Number of current processes */ 757 unsigned short pad; /* explicit padding for m68k */ 758 unsigned long totalhigh; /* Total high memory size */ 759 unsigned long freehigh; /* Available high memory size */ 760 unsigned int mem_unit; /* Memory unit size in bytes */ 761 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 762 }; 763 764 /* Force a compilation error if condition is true */ 765 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) 766 767 /* Force a compilation error if condition is constant and true */ 768 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 769 770 /* Force a compilation error if a constant expression is not a power of 2 */ 771 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ 772 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) 773 774 /* Force a compilation error if condition is true, but also produce a 775 result (of value 0 and type size_t), so the expression can be used 776 e.g. in a structure initializer (or where-ever else comma expressions 777 aren't permitted). */ 778 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 779 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) 780 781 /* Trap pasters of __FUNCTION__ at compile-time */ 782 #define __FUNCTION__ (__func__) 783 784 /* This helps us to avoid #ifdef CONFIG_NUMA */ 785 #ifdef CONFIG_NUMA 786 #define NUMA_BUILD 1 787 #else 788 #define NUMA_BUILD 0 789 #endif 790 791 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ 792 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 793 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD 794 #endif 795 796 #endif 797