blob: 1ac6f0f2aeecc3e41667bc105d1aa89f15054f54 [file] [log] [blame]
yuezonghe824eb0c2024-06-27 02:32:26 -07001#ifndef _LINUX_KERNEL_H
2#define _LINUX_KERNEL_H
3
4#include <linux/sysinfo.h>
5
6/*
7 * 'kernel.h' contains some often-used function prototypes etc
8 */
9#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
10#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
11
12#ifdef __KERNEL__
13
14#include <stdarg.h>
15#include <linux/linkage.h>
16#include <linux/stddef.h>
17#include <linux/types.h>
18#include <linux/compiler.h>
19#include <linux/bitops.h>
20#include <linux/log2.h>
21#include <linux/typecheck.h>
22#include <linux/printk.h>
23#include <linux/dynamic_debug.h>
24#include <asm/byteorder.h>
25
26#ifdef CONFIG_MEM_CHECK
27#define MEM_CHECK_THREAD_NAME "thread3"
28#define CONFIG_MEM_CHECK_SIZE (8*1024)
29#endif
30#define USHRT_MAX ((u16)(~0U))
31#define SHRT_MAX ((s16)(USHRT_MAX>>1))
32#define SHRT_MIN ((s16)(-SHRT_MAX - 1))
33#define INT_MAX ((int)(~0U>>1))
34#define INT_MIN (-INT_MAX - 1)
35#define UINT_MAX (~0U)
36#define LONG_MAX ((long)(~0UL>>1))
37#define LONG_MIN (-LONG_MAX - 1)
38#define ULONG_MAX (~0UL)
39#define LLONG_MAX ((long long)(~0ULL>>1))
40#define LLONG_MIN (-LLONG_MAX - 1)
41#define ULLONG_MAX (~0ULL)
42#define SIZE_MAX (~(size_t)0)
43
44#define STACK_MAGIC 0xdeadbeef
45
46#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
47#define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask))
48#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
49#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
50
51#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
52
53/*
54 * This looks more complex than it should be. But we need to
55 * get the type for the ~ right in round_down (it needs to be
56 * as wide as the result!), and we want to evaluate the macro
57 * arguments just once each.
58 */
59#define __round_mask(x, y) ((__typeof__(x))((y)-1))
60#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
61#define round_down(x, y) ((x) & ~__round_mask(x, y))
62
63#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
64#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
65#define DIV_ROUND_UP_ULL(ll,d) \
66 ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
67
68#if BITS_PER_LONG == 32
69# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
70#else
71# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
72#endif
73
74/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
75#define roundup(x, y) ( \
76{ \
77 const typeof(y) __y = y; \
78 (((x) + (__y - 1)) / __y) * __y; \
79} \
80)
81#define rounddown(x, y) ( \
82{ \
83 typeof(x) __x = (x); \
84 __x - (__x % (y)); \
85} \
86)
87#define DIV_ROUND_CLOSEST(x, divisor)( \
88{ \
89 typeof(divisor) __divisor = divisor; \
90 (((x) + ((__divisor) / 2)) / (__divisor)); \
91} \
92)
93
94/*
95 * Multiplies an integer by a fraction, while avoiding unnecessary
96 * overflow or loss of precision.
97 */
98#define mult_frac(x, numer, denom)( \
99{ \
100 typeof(x) quot = (x) / (denom); \
101 typeof(x) rem = (x) % (denom); \
102 (quot * (numer)) + ((rem * (numer)) / (denom)); \
103} \
104)
105
106
107#define _RET_IP_ (unsigned long)__builtin_return_address(0)
108#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
109
110#ifdef CONFIG_LBDAF
111# include <asm/div64.h>
112# define sector_div(a, b) do_div(a, b)
113#else
114# define sector_div(n, b)( \
115{ \
116 int _res; \
117 _res = (n) % (b); \
118 (n) /= (b); \
119 _res; \
120} \
121)
122#endif
123
124/**
125 * upper_32_bits - return bits 32-63 of a number
126 * @n: the number we're accessing
127 *
128 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
129 * the "right shift count >= width of type" warning when that quantity is
130 * 32-bits.
131 */
132#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
133
134/**
135 * lower_32_bits - return bits 0-31 of a number
136 * @n: the number we're accessing
137 */
138#define lower_32_bits(n) ((u32)(n))
139
140struct completion;
141struct pt_regs;
142struct user;
143
144#ifdef CONFIG_PREEMPT_VOLUNTARY
145extern int _cond_resched(void);
146# define might_resched() _cond_resched()
147#else
148# define might_resched() do { } while (0)
149#endif
150
151#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
152 void __might_sleep(const char *file, int line, int preempt_offset);
153/**
154 * might_sleep - annotation for functions that can sleep
155 *
156 * this macro will print a stack trace if it is executed in an atomic
157 * context (spinlock, irq-handler, ...).
158 *
159 * This is a useful debugging help to be able to catch problems early and not
160 * be bitten later when the calling function happens to sleep when it is not
161 * supposed to.
162 */
163# define might_sleep() \
164 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
165#else
166 static inline void __might_sleep(const char *file, int line,
167 int preempt_offset) { }
168# define might_sleep() do { might_resched(); } while (0)
169#endif
170
171#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
172
173/*
174 * abs() handles unsigned and signed longs, ints, shorts and chars. For all
175 * input types abs() returns a signed long.
176 * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
177 * for those.
178 */
179#define abs(x) ({ \
180 long ret; \
181 if (sizeof(x) == sizeof(long)) { \
182 long __x = (x); \
183 ret = (__x < 0) ? -__x : __x; \
184 } else { \
185 int __x = (x); \
186 ret = (__x < 0) ? -__x : __x; \
187 } \
188 ret; \
189 })
190
191#define abs64(x) ({ \
192 s64 __x = (x); \
193 (__x < 0) ? -__x : __x; \
194 })
195
196#ifdef CONFIG_PROVE_LOCKING
197void might_fault(void);
198#else
199static inline void might_fault(void)
200{
201 might_sleep();
202}
203#endif
204
205extern struct atomic_notifier_head panic_notifier_list;
206extern long (*panic_blink)(int state);
207__printf(1, 2)
208void panic(const char *fmt, ...)
209 __noreturn __cold;
210extern void oops_enter(void);
211extern void oops_exit(void);
212void print_oops_end_marker(void);
213extern int oops_may_print(void);
214void do_exit(long error_code)
215 __noreturn;
216void complete_and_exit(struct completion *, long)
217 __noreturn;
218
219/* Internal, do not use. */
220int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
221int __must_check _kstrtol(const char *s, unsigned int base, long *res);
222
223int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
224int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
225static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
226{
227 /*
228 * We want to shortcut function call, but
229 * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
230 */
231 if (sizeof(unsigned long) == sizeof(unsigned long long) &&
232 __alignof__(unsigned long) == __alignof__(unsigned long long))
233 return kstrtoull(s, base, (unsigned long long *)res);
234 else
235 return _kstrtoul(s, base, res);
236}
237
238static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
239{
240 /*
241 * We want to shortcut function call, but
242 * __builtin_types_compatible_p(long, long long) = 0.
243 */
244 if (sizeof(long) == sizeof(long long) &&
245 __alignof__(long) == __alignof__(long long))
246 return kstrtoll(s, base, (long long *)res);
247 else
248 return _kstrtol(s, base, res);
249}
250
251int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
252int __must_check kstrtoint(const char *s, unsigned int base, int *res);
253
254static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
255{
256 return kstrtoull(s, base, res);
257}
258
259static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
260{
261 return kstrtoll(s, base, res);
262}
263
264static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
265{
266 return kstrtouint(s, base, res);
267}
268
269static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
270{
271 return kstrtoint(s, base, res);
272}
273
274int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
275int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
276int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
277int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
278
279int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
280int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
281int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
282int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
283int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
284int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
285int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
286int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
287int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
288int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
289
290static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
291{
292 return kstrtoull_from_user(s, count, base, res);
293}
294
295static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
296{
297 return kstrtoll_from_user(s, count, base, res);
298}
299
300static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
301{
302 return kstrtouint_from_user(s, count, base, res);
303}
304
305static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
306{
307 return kstrtoint_from_user(s, count, base, res);
308}
309
310/* Obsolete, do not use. Use kstrto<foo> instead */
311
312extern unsigned long simple_strtoul(const char *,char **,unsigned int);
313extern long simple_strtol(const char *,char **,unsigned int);
314extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
315extern long long simple_strtoll(const char *,char **,unsigned int);
316#define strict_strtoul kstrtoul
317#define strict_strtol kstrtol
318#define strict_strtoull kstrtoull
319#define strict_strtoll kstrtoll
320
321extern int num_to_str(char *buf, int size, unsigned long long num);
322
323/* lib/printf utilities */
324
325extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
326extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list);
327extern __printf(3, 4)
328int snprintf(char *buf, size_t size, const char *fmt, ...);
329extern __printf(3, 0)
330int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
331extern __printf(3, 4)
332int scnprintf(char *buf, size_t size, const char *fmt, ...);
333extern __printf(3, 0)
334int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
335extern __printf(2, 3)
336char *kasprintf(gfp_t gfp, const char *fmt, ...);
337extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
338
339extern __scanf(2, 3)
340int sscanf(const char *, const char *, ...);
341extern __scanf(2, 0)
342int vsscanf(const char *, const char *, va_list);
343
344extern int get_option(char **str, int *pint);
345extern char *get_options(const char *str, int nints, int *ints);
346extern unsigned long long memparse(const char *ptr, char **retptr);
347
348extern int core_kernel_text(unsigned long addr);
349extern int core_kernel_data(unsigned long addr);
350extern int __kernel_text_address(unsigned long addr);
351extern int kernel_text_address(unsigned long addr);
352extern int func_ptr_is_kernel_text(void *ptr);
353
354struct pid;
355extern struct pid *session_of_pgrp(struct pid *pgrp);
356
357unsigned long int_sqrt(unsigned long);
358
359extern void bust_spinlocks(int yes);
360extern void wake_up_klogd(void);
361extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
362extern int panic_timeout;
363extern int panic_on_oops;
364extern int panic_on_unrecovered_nmi;
365extern int panic_on_io_nmi;
366extern int sysctl_panic_on_stackoverflow;
367extern const char *print_tainted(void);
368extern void add_taint(unsigned flag);
369extern int test_taint(unsigned flag);
370extern unsigned long get_taint(void);
371extern int root_mountflags;
372
373extern bool early_boot_irqs_disabled;
374
375/* Values used for system_state */
376extern enum system_states {
377 SYSTEM_BOOTING,
378 SYSTEM_RUNNING,
379 SYSTEM_HALT,
380 SYSTEM_POWER_OFF,
381 SYSTEM_RESTART,
382 SYSTEM_SUSPEND,
383} system_state;
384
385#define TAINT_PROPRIETARY_MODULE 0
386#define TAINT_FORCED_MODULE 1
387#define TAINT_UNSAFE_SMP 2
388#define TAINT_FORCED_RMMOD 3
389#define TAINT_MACHINE_CHECK 4
390#define TAINT_BAD_PAGE 5
391#define TAINT_USER 6
392#define TAINT_DIE 7
393#define TAINT_OVERRIDDEN_ACPI_TABLE 8
394#define TAINT_WARN 9
395#define TAINT_CRAP 10
396#define TAINT_FIRMWARE_WORKAROUND 11
397#define TAINT_OOT_MODULE 12
398
399extern const char hex_asc[];
400#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
401#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
402
403static inline char *hex_byte_pack(char *buf, u8 byte)
404{
405 *buf++ = hex_asc_hi(byte);
406 *buf++ = hex_asc_lo(byte);
407 return buf;
408}
409
410static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
411{
412 return hex_byte_pack(buf, byte);
413}
414
415extern int hex_to_bin(char ch);
416extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
417
418/*
419 * General tracing related utility functions - trace_printk(),
420 * tracing_on/tracing_off and tracing_start()/tracing_stop
421 *
422 * Use tracing_on/tracing_off when you want to quickly turn on or off
423 * tracing. It simply enables or disables the recording of the trace events.
424 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
425 * file, which gives a means for the kernel and userspace to interact.
426 * Place a tracing_off() in the kernel where you want tracing to end.
427 * From user space, examine the trace, and then echo 1 > tracing_on
428 * to continue tracing.
429 *
430 * tracing_stop/tracing_start has slightly more overhead. It is used
431 * by things like suspend to ram where disabling the recording of the
432 * trace is not enough, but tracing must actually stop because things
433 * like calling smp_processor_id() may crash the system.
434 *
435 * Most likely, you want to use tracing_on/tracing_off.
436 */
437#ifdef CONFIG_RING_BUFFER
438/* trace_off_permanent stops recording with no way to bring it back */
439void tracing_off_permanent(void);
440#else
441static inline void tracing_off_permanent(void) { }
442#endif
443
444enum ftrace_dump_mode {
445 DUMP_NONE,
446 DUMP_ALL,
447 DUMP_ORIG,
448};
449
450#ifdef CONFIG_TRACING
451void tracing_on(void);
452void tracing_off(void);
453int tracing_is_on(void);
454
455extern void tracing_start(void);
456extern void tracing_stop(void);
457extern void ftrace_off_permanent(void);
458
459static inline __printf(1, 2)
460void ____trace_printk_check_format(const char *fmt, ...)
461{
462}
463#define __trace_printk_check_format(fmt, args...) \
464do { \
465 if (0) \
466 ____trace_printk_check_format(fmt, ##args); \
467} while (0)
468
469/**
470 * trace_printk - printf formatting in the ftrace buffer
471 * @fmt: the printf format for printing
472 *
473 * Note: __trace_printk is an internal function for trace_printk and
474 * the @ip is passed in via the trace_printk macro.
475 *
476 * This function allows a kernel developer to debug fast path sections
477 * that printk is not appropriate for. By scattering in various
478 * printk like tracing in the code, a developer can quickly see
479 * where problems are occurring.
480 *
481 * This is intended as a debugging tool for the developer only.
482 * Please refrain from leaving trace_printks scattered around in
483 * your code.
484 */
485
486#define trace_printk(fmt, args...) \
487do { \
488 __trace_printk_check_format(fmt, ##args); \
489 if (__builtin_constant_p(fmt)) { \
490 static const char *trace_printk_fmt \
491 __attribute__((section("__trace_printk_fmt"))) = \
492 __builtin_constant_p(fmt) ? fmt : NULL; \
493 \
494 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
495 } else \
496 __trace_printk(_THIS_IP_, fmt, ##args); \
497} while (0)
498
499extern __printf(2, 3)
500int __trace_bprintk(unsigned long ip, const char *fmt, ...);
501
502extern __printf(2, 3)
503int __trace_printk(unsigned long ip, const char *fmt, ...);
504
505extern void trace_dump_stack(void);
506
507/*
508 * The double __builtin_constant_p is because gcc will give us an error
509 * if we try to allocate the static variable to fmt if it is not a
510 * constant. Even with the outer if statement.
511 */
512#define ftrace_vprintk(fmt, vargs) \
513do { \
514 if (__builtin_constant_p(fmt)) { \
515 static const char *trace_printk_fmt \
516 __attribute__((section("__trace_printk_fmt"))) = \
517 __builtin_constant_p(fmt) ? fmt : NULL; \
518 \
519 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
520 } else \
521 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
522} while (0)
523
524extern int
525__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
526
527extern int
528__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
529
530extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
531#else
532static inline __printf(1, 2)
533int trace_printk(const char *fmt, ...);
534
535static inline void tracing_start(void) { }
536static inline void tracing_stop(void) { }
537static inline void ftrace_off_permanent(void) { }
538static inline void trace_dump_stack(void) { }
539
540static inline void tracing_on(void) { }
541static inline void tracing_off(void) { }
542static inline int tracing_is_on(void) { return 0; }
543
544static inline int
545trace_printk(const char *fmt, ...)
546{
547 return 0;
548}
549static inline int
550ftrace_vprintk(const char *fmt, va_list ap)
551{
552 return 0;
553}
554static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
555#endif /* CONFIG_TRACING */
556
557/*
558 * min()/max()/clamp() macros that also do
559 * strict type-checking.. See the
560 * "unnecessary" pointer comparison.
561 */
562#define min(x, y) ({ \
563 typeof(x) _min1 = (x); \
564 typeof(y) _min2 = (y); \
565 (void) (&_min1 == &_min2); \
566 _min1 < _min2 ? _min1 : _min2; })
567
568#define max(x, y) ({ \
569 typeof(x) _max1 = (x); \
570 typeof(y) _max2 = (y); \
571 (void) (&_max1 == &_max2); \
572 _max1 > _max2 ? _max1 : _max2; })
573
574#define min3(x, y, z) ({ \
575 typeof(x) _min1 = (x); \
576 typeof(y) _min2 = (y); \
577 typeof(z) _min3 = (z); \
578 (void) (&_min1 == &_min2); \
579 (void) (&_min1 == &_min3); \
580 _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
581 (_min2 < _min3 ? _min2 : _min3); })
582
583#define max3(x, y, z) ({ \
584 typeof(x) _max1 = (x); \
585 typeof(y) _max2 = (y); \
586 typeof(z) _max3 = (z); \
587 (void) (&_max1 == &_max2); \
588 (void) (&_max1 == &_max3); \
589 _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
590 (_max2 > _max3 ? _max2 : _max3); })
591
592/**
593 * min_not_zero - return the minimum that is _not_ zero, unless both are zero
594 * @x: value1
595 * @y: value2
596 */
597#define min_not_zero(x, y) ({ \
598 typeof(x) __x = (x); \
599 typeof(y) __y = (y); \
600 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
601
602/**
603 * clamp - return a value clamped to a given range with strict typechecking
604 * @val: current value
605 * @min: minimum allowable value
606 * @max: maximum allowable value
607 *
608 * This macro does strict typechecking of min/max to make sure they are of the
609 * same type as val. See the unnecessary pointer comparisons.
610 */
611#define clamp(val, min, max) ({ \
612 typeof(val) __val = (val); \
613 typeof(min) __min = (min); \
614 typeof(max) __max = (max); \
615 (void) (&__val == &__min); \
616 (void) (&__val == &__max); \
617 __val = __val < __min ? __min: __val; \
618 __val > __max ? __max: __val; })
619
620/*
621 * ..and if you can't take the strict
622 * types, you can specify one yourself.
623 *
624 * Or not use min/max/clamp at all, of course.
625 */
626#define min_t(type, x, y) ({ \
627 type __min1 = (x); \
628 type __min2 = (y); \
629 __min1 < __min2 ? __min1: __min2; })
630
631#define max_t(type, x, y) ({ \
632 type __max1 = (x); \
633 type __max2 = (y); \
634 __max1 > __max2 ? __max1: __max2; })
635
636/**
637 * clamp_t - return a value clamped to a given range using a given type
638 * @type: the type of variable to use
639 * @val: current value
640 * @min: minimum allowable value
641 * @max: maximum allowable value
642 *
643 * This macro does no typechecking and uses temporary variables of type
644 * 'type' to make all the comparisons.
645 */
646#define clamp_t(type, val, min, max) ({ \
647 type __val = (val); \
648 type __min = (min); \
649 type __max = (max); \
650 __val = __val < __min ? __min: __val; \
651 __val > __max ? __max: __val; })
652
653/**
654 * clamp_val - return a value clamped to a given range using val's type
655 * @val: current value
656 * @min: minimum allowable value
657 * @max: maximum allowable value
658 *
659 * This macro does no typechecking and uses temporary variables of whatever
660 * type the input argument 'val' is. This is useful when val is an unsigned
661 * type and min and max are literals that will otherwise be assigned a signed
662 * integer type.
663 */
664#define clamp_val(val, min, max) ({ \
665 typeof(val) __val = (val); \
666 typeof(val) __min = (min); \
667 typeof(val) __max = (max); \
668 __val = __val < __min ? __min: __val; \
669 __val > __max ? __max: __val; })
670
671
672/*
673 * swap - swap value of @a and @b
674 */
675#define swap(a, b) \
676 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
677
678/**
679 * container_of - cast a member of a structure out to the containing structure
680 * @ptr: the pointer to the member.
681 * @type: the type of the container struct this is embedded in.
682 * @member: the name of the member within the struct.
683 *
684 */
685#define container_of(ptr, type, member) ({ \
686 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
687 (type *)( (char *)__mptr - offsetof(type,member) );})
688
689/* Trap pasters of __FUNCTION__ at compile-time */
690#define __FUNCTION__ (__func__)
691
692/* This helps us to avoid #ifdef CONFIG_NUMA */
693#ifdef CONFIG_NUMA
694#define NUMA_BUILD 1
695#else
696#define NUMA_BUILD 0
697#endif
698
699/* This helps us avoid #ifdef CONFIG_COMPACTION */
700#ifdef CONFIG_COMPACTION
701#define COMPACTION_BUILD 1
702#else
703#define COMPACTION_BUILD 0
704#endif
705
706/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
707#ifdef CONFIG_FTRACE_MCOUNT_RECORD
708# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
709#endif
710
711extern int do_sysinfo(struct sysinfo *info);
712
713/* To identify board information in panic logs, set this */
714extern char *mach_panic_string;
715
716/* AP LOG BEGIN */
717extern int aplog_printk(unsigned int module, unsigned int module_level,
718 const char *fmt, ...);
719/* AP LOG END */
720
721/* AP LOG BEGIN */
722/* AP LOG module name */
723#ifdef MODULE_PRINTF
724#undef MODULE_PRINTF
725#endif
726#define MODULE_PRINTF 1 // Ô­printf
727
728#ifdef MODULE_PRINTK
729#undef MODULE_PRINTK
730#endif
731#define MODULE_PRINTK 2 // Ô­printk
732
733#ifdef MODULE_CALL
734#undef MODULE_CALL
735#endif
736#define MODULE_CALL 3 // ͨ»°
737
738#ifdef MODULE_MESSAGE
739#undef MODULE_MESSAGE
740#endif
741#define MODULE_MESSAGE 4 // ¶ÌÏûÏ¢
742
743#ifdef MODULE_DATA
744#undef MODULE_DATA
745#endif
746#define MODULE_DATA 5 // Êý¾ÝÒµÎñ
747
748#ifdef MODULE_SETTING
749#undef MODULE_SETTING
750#endif
751#define MODULE_SETTING 6 // ÉèÖù¦ÄÜ
752
753#ifdef MODULE_DISPLAY
754#undef MODULE_DISPLAY
755#endif
756#define MODULE_DISPLAY 7 // ÏÔʾ¹¦ÄÜ
757
758#ifdef MODULE_INTERNET
759#undef MODULE_INTERNET
760#endif
761#define MODULE_INTERNET 8 // ÉÏÍø¹¦ÄÜ
762
763#ifdef MODULE_INSTALL
764#undef MODULE_INSTALL
765#endif
766#define MODULE_INSTALL 9 // °²×°¹¦ÄÜ
767
768#ifdef MODULE_FOTA
769#undef MODULE_FOTA
770#endif
771#define MODULE_FOTA 10 // Éý¼¶¹¦ÄÜ
772
773#ifdef MODULE_DIAGNOSIS
774#undef MODULE_DIAGNOSIS
775#endif
776#define MODULE_DIAGNOSIS 11 // Õï¶Ï¹¦ÄÜ
777
778#ifdef MODULE_SYSTEM_LOG
779#undef MODULE_SYSTEM_LOG
780#endif
781#define MODULE_SYSTEM_LOG 12 // ϵͳÈÕÖ¾
782
783#ifdef MODULE_T_CARD
784#undef MODULE_T_CARD
785#endif
786#define MODULE_T_CARD 13 // T¿¨ÒµÎñ
787
788#ifdef MODULE_DRIVERS
789#undef MODULE_DRIVERS
790#endif
791#define MODULE_DRIVERS 14 // Çý¶¯¹¦ÄÜ
792
793#ifdef MODULE_PROTOCOL
794#undef MODULE_PROTOCOL
795#endif
796#define MODULE_PROTOCOL 15 // ÍøÂçЭÒé
797
798#ifdef MODULE_DM
799#undef MODULE_DM
800#endif
801#define MODULE_DM 16 // É豸¹ÜÀí
802
803#ifdef MODULE_WIFI
804#undef MODULE_WIFI
805#endif
806#define MODULE_WIFI 17 // WIFIÎÞÏß¿í´ø
807
808#ifdef MODULE_APN
809#undef MODULE_APN
810#endif
811#define MODULE_APN 18 // APNÍøÂç½ÓÈë
812
813#ifdef MODULE_POWER
814#undef MODULE_POWER
815#endif
816#define MODULE_POWER 19 // ¹¦ºÄÊ¡µç
817
818#ifdef MODULE_WEB_UI
819#undef MODULE_WEB_UI
820#endif
821#define MODULE_WEB_UI 20 // WEBÓû§½çÃæ
822
823#ifdef MODULE_PC_UI
824#undef MODULE_PC_UI
825#endif
826#define MODULE_PC_UI 21 // PCÓû§½çÃæ
827
828#ifdef MODULE_PC_TOOLS
829#undef MODULE_PC_TOOLS
830#endif
831#define MODULE_PC_TOOLS 22 // PC¹¤¾ß
832
833#ifdef MODULE_AP_LOG
834#undef MODULE_AP_LOG
835#endif
836#define MODULE_AP_LOG 23 // AP LOG¹¦ÄÜ
837
838#ifdef MODULE_OTHERS
839#undef MODULE_OTHERS
840#endif
841#define MODULE_OTHERS 24 // ÆäËü¹¦ÄÜ
842
843/* AP LOG module level */
844#ifdef MODULE_LEVEL_EMERG
845#undef MODULE_LEVEL_EMERG
846#endif
847#define MODULE_LEVEL_EMERG 0 // ½ô¼±Ê¼þÏûÏ¢£¬ÏµÍ³±ÀÀ£Ö®Ç°Ìáʾ£¬±íʾϵͳ²»¿ÉÓÃ
848
849#ifdef MODULE_LEVEL_ALERT
850#undef MODULE_LEVEL_ALERT
851#endif
852#define MODULE_LEVEL_ALERT 1 // ±¨¸æÏûÏ¢£¬±íʾ±ØÐëÁ¢¼´²ÉÈ¡´ëÊ©
853
854#ifdef MODULE_LEVEL_CRIT
855#undef MODULE_LEVEL_CRIT
856#endif
857#define MODULE_LEVEL_CRIT 2 // ÁÙ½çÌõ¼þ£¬Í¨³£Éæ¼°ÑÏÖØµÄÓ²¼þ»òÈí¼þ²Ù×÷ʧ°Ü
858
859#ifdef MODULE_LEVEL_ERR
860#undef MODULE_LEVEL_ERR
861#endif
862#define MODULE_LEVEL_ERR 3 // ´íÎóÌõ¼þ£¬Çý¶¯³ÌÐò³£ÓÃKERN_ERRÀ´±¨¸æÓ²¼þµÄ´íÎó
863
864#ifdef MODULE_LEVEL_WARNING
865#undef MODULE_LEVEL_WARNING
866#endif
867#define MODULE_LEVEL_WARNING 4 // ¾¯¸æÌõ¼þ£¬¶Ô¿ÉÄܳöÏÖÎÊÌâµÄÇé¿ö½øÐо¯¸æ
868
869#ifdef MODULE_LEVEL_NOTICE
870#undef MODULE_LEVEL_NOTICE
871#endif
872#define MODULE_LEVEL_NOTICE 5 // Õý³£µ«ÓÖÖØÒªµÄÌõ¼þ£¬ÓÃÓÚÌáÐÑ
873
874#ifdef MODULE_LEVEL_INFO
875#undef MODULE_LEVEL_INFO
876#endif
877#define MODULE_LEVEL_INFO 6 // ÌáʾÐÅÏ¢£¬ÈçÇý¶¯³ÌÐòÆô¶¯Ê±£¬´òÓ¡Ó²¼þÐÅÏ¢
878
879#ifdef MODULE_LEVEL_DEBUG
880#undef MODULE_LEVEL_DEBUG
881#endif
882#define MODULE_LEVEL_DEBUG 7 // µ÷ÊÔ¼¶±ðµÄÏûÏ¢
883
884#ifdef AP_LOG_ENABLE
885#undef AP_LOG_ENABLE
886#endif
887#define AP_LOG_ENABLE 1
888/* AP LOG END */
889
890#ifdef CONFIG_PM
891extern asmlinkage int printk(const char *fmt, ...);
892#define PSM_DBG(x, ...) printk("%s: " x "\n", __func__, ##__VA_ARGS__)
893#else
894#define PSM_DBG(x, args...)
895#endif
896
897#endif /* __KERNEL__ */
898
899#endif