cregit-Linux how code gets into the kernel

Release 4.14 include/linux/kernel.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KERNEL_H

#define _LINUX_KERNEL_H


#include <stdarg.h>
#include <linux/linkage.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/typecheck.h>
#include <linux/printk.h>
#include <linux/build_bug.h>
#include <asm/byteorder.h>
#include <uapi/linux/kernel.h>


#define USHRT_MAX	((u16)(~0U))

#define SHRT_MAX	((s16)(USHRT_MAX>>1))

#define SHRT_MIN	((s16)(-SHRT_MAX - 1))

#define INT_MAX		((int)(~0U>>1))

#define INT_MIN		(-INT_MAX - 1)

#define UINT_MAX	(~0U)

#define LONG_MAX	((long)(~0UL>>1))

#define LONG_MIN	(-LONG_MAX - 1)

#define ULONG_MAX	(~0UL)

#define LLONG_MAX	((long long)(~0ULL>>1))

#define LLONG_MIN	(-LLONG_MAX - 1)

#define ULLONG_MAX	(~0ULL)

#define SIZE_MAX	(~(size_t)0)


#define U8_MAX		((u8)~0U)

#define S8_MAX		((s8)(U8_MAX>>1))

#define S8_MIN		((s8)(-S8_MAX - 1))

#define U16_MAX		((u16)~0U)

#define S16_MAX		((s16)(U16_MAX>>1))

#define S16_MIN		((s16)(-S16_MAX - 1))

#define U32_MAX		((u32)~0U)

#define S32_MAX		((s32)(U32_MAX>>1))

#define S32_MIN		((s32)(-S32_MAX - 1))

#define U64_MAX		((u64)~0ULL)

#define S64_MAX		((s64)(U64_MAX>>1))

#define S64_MIN		((s64)(-S64_MAX - 1))


#define STACK_MAGIC	0xdeadbeef

/**
 * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
 * @x: value to repeat
 *
 * NOTE: @x is not checked for > 0xff; larger values produce odd results.
 */

#define REPEAT_BYTE(x)	((~0ul / 0xff) * (x))

/* @a is a power of 2 value */

#define ALIGN(x, a)		__ALIGN_KERNEL((x), (a))

#define ALIGN_DOWN(x, a)	__ALIGN_KERNEL((x) - ((a) - 1), (a))

#define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask))

#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))

#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)

/* generic data direction definitions */

#define READ			0

#define WRITE			1

/**
 * ARRAY_SIZE - get the number of elements in array @arr
 * @arr: array to be sized
 */

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))


#define u64_to_user_ptr(x) (               \
{                                       \
        typecheck(u64, x);              \
        (void __user *)(uintptr_t)x;    \
}                                       \
)

/*
 * This looks more complex than it should be. But we need to
 * get the type for the ~ right in round_down (it needs to be
 * as wide as the result!), and we want to evaluate the macro
 * arguments just once each.
 */

#define __round_mask(x, y) ((__typeof__(x))((y)-1))

#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)

#define round_down(x, y) ((x) & ~__round_mask(x, y))

/**
 * FIELD_SIZEOF - get the size of a struct's field
 * @t: the target struct
 * @f: the target struct's field
 * Return: the size of @f in the struct definition without having a
 * declared instance of @t.
 */

#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))


#define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP


#define DIV_ROUND_DOWN_ULL(ll, d) \
	({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })


#define DIV_ROUND_UP_ULL(ll, d)		DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d))

#if BITS_PER_LONG == 32

# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
#else

# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
#endif

/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */

#define roundup(x, y) (                                       \
{                                                       \
        const typeof(y) __y = y;                        \
        (((x) + (__y - 1)) / __y) * __y;                \
}                                                       \
)

#define rounddown(x, y) (                               \
{                                                       \
        typeof(x) __x = (x);                            \
        __x - (__x % (y));                              \
}                                                       \
)

/*
 * Divide positive or negative dividend by positive or negative divisor
 * and round to closest integer. Result is undefined for negative
 * divisors if the dividend variable type is unsigned and for negative
 * dividends if the divisor variable type is unsigned.
 */

#define DIV_ROUND_CLOSEST(x, divisor)(                       \
{                                                       \
        typeof(x) __x = x;                              \
        typeof(divisor) __d = divisor;                  \
        (((typeof(x))-1) > 0 ||                         \
         ((typeof(divisor))-1) > 0 ||                   \
         (((__x) > 0) == ((__d) > 0))) ?                \
                (((__x) + ((__d) / 2)) / (__d)) :       \
                (((__x) - ((__d) / 2)) / (__d));        \
}                                                       \
)
/*
 * Same as above but for u64 dividends. divisor must be a 32-bit
 * number.
 */

#define DIV_ROUND_CLOSEST_ULL(x, divisor)(               \
{                                                       \
        typeof(divisor) __d = divisor;                  \
        unsigned long long _tmp = (x) + (__d) / 2;      \
        do_div(_tmp, __d);                              \
        _tmp;                                           \
}                                                       \
)

/*
 * Multiplies an integer by a fraction, while avoiding unnecessary
 * overflow or loss of precision.
 */

#define mult_frac(x, numer, denom)(                       \
{                                                       \
        typeof(x) quot = (x) / (denom);                 \
        typeof(x) rem  = (x) % (denom);                 \
        (quot * (numer)) + ((rem * (numer)) / (denom)); \
}                                                       \
)



#define _RET_IP_		(unsigned long)__builtin_return_address(0)

#define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })

#ifdef CONFIG_LBDAF
# include <asm/div64.h>

# define sector_div(a, b) do_div(a, b)
#else

# define sector_div(n, b)( \
{ \
        int _res; \
        _res = (n) % (b); \
        (n) /= (b); \
        _res; \
} \
)
#endif

/**
 * upper_32_bits - return bits 32-63 of a number
 * @n: the number we're accessing
 *
 * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
 * the "right shift count >= width of type" warning when that quantity is
 * 32-bits.
 */

#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))

/**
 * lower_32_bits - return bits 0-31 of a number
 * @n: the number we're accessing
 */

#define lower_32_bits(n) ((u32)(n))

struct completion;
struct pt_regs;
struct user;

#ifdef CONFIG_PREEMPT_VOLUNTARY
extern int _cond_resched(void);

# define might_resched() _cond_resched()
#else

# define might_resched() do { } while (0)
#endif

#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
  void ___might_sleep(const char *file, int line, int preempt_offset);
  void __might_sleep(const char *file, int line, int preempt_offset);
/**
 * might_sleep - annotation for functions that can sleep
 *
 * this macro will print a stack trace if it is executed in an atomic
 * context (spinlock, irq-handler, ...).
 *
 * This is a useful debugging help to be able to catch problems early and not
 * be bitten later when the calling function happens to sleep when it is not
 * supposed to.
 */

# define might_sleep() \
	do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)

# define sched_annotate_sleep()	(current->task_state_change = 0)
#else
  
static inline void ___might_sleep(const char *file, int line, int preempt_offset) { }

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static inline void __might_sleep(const char *file, int line, int preempt_offset) { }

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Frédéric Weisbecker1694.12%266.67%
Simon Kågström15.88%133.33%
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# define might_sleep() do { might_resched(); } while (0) # define sched_annotate_sleep() do { } while (0) #endif #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) /** * abs - return absolute value of an argument * @x: the value. If it is unsigned type, it is converted to signed type first. * char is treated as if it was signed (regardless of whether it really is) * but the macro's return type is preserved as char. * * Return: an absolute value of x. */ #define abs(x) __abs_choose_expr(x, long long, \ __abs_choose_expr(x, long, \ __abs_choose_expr(x, int, \ __abs_choose_expr(x, short, \ __abs_choose_expr(x, char, \ __builtin_choose_expr( \ __builtin_types_compatible_p(typeof(x), char), \ (char)({ signed char __x = (x); __x<0?-__x:__x; }), \ ((void)0))))))) #define __abs_choose_expr(x, type, other) __builtin_choose_expr( \ __builtin_types_compatible_p(typeof(x), signed type) || \ __builtin_types_compatible_p(typeof(x), unsigned type), \ ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) /** * reciprocal_scale - "scale" a value into range [0, ep_ro) * @val: value * @ep_ro: right open interval endpoint * * Perform a "reciprocal multiplication" in order to "scale" a value into * range [0, @ep_ro), where the upper interval endpoint is right-open. * This is useful, e.g. for accessing a index of an array containing * @ep_ro elements, for example. Think of it as sort of modulus, only that * the result isn't that of modulo. ;) Note that if initial input is a * small value, then result will return 0. * * Return: a result based on @val in interval [0, @ep_ro). */
static inline u32 reciprocal_scale(u32 val, u32 ep_ro) { return (u32)(((u64) val * ep_ro) >> 32); }

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Daniel Borkmann30100.00%1100.00%
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#if defined(CONFIG_MMU) && \ (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) #define might_fault() __might_fault(__FILE__, __LINE__) void __might_fault(const char *file, int line); #else
static inline void might_fault(void) { }

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Nicholas Piggin787.50%150.00%
Michael S. Tsirkin112.50%150.00%
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#endif extern struct atomic_notifier_head panic_notifier_list; extern long (*panic_blink)(int state); __printf(1, 2) void panic(const char *fmt, ...) __noreturn __cold; void nmi_panic(struct pt_regs *regs, const char *msg); extern void oops_enter(void); extern void oops_exit(void); void print_oops_end_marker(void); extern int oops_may_print(void); void do_exit(long error_code) __noreturn; void complete_and_exit(struct completion *, long) __noreturn; #ifdef CONFIG_ARCH_HAS_REFCOUNT void refcount_error_report(struct pt_regs *regs, const char *err); #else
static inline void refcount_error_report(struct pt_regs *regs, const char *err) { }

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Kees Cook16100.00%1100.00%
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#endif /* Internal, do not use. */ int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res); int __must_check _kstrtol(const char *s, unsigned int base, long *res); int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res); int __must_check kstrtoll(const char *s, unsigned int base, long long *res); /** * kstrtoul - convert a string to an unsigned long * @s: The start of the string. The string must be null-terminated, and may also * include a single newline before its terminating null. The first character * may also be a plus sign, but not a minus sign. * @base: The number base to use. The maximum supported base is 16. If base is * given as 0, then the base of the string is automatically detected with the * conventional semantics - If it begins with 0x the number will be parsed as a * hexadecimal (case insensitive), if it otherwise begins with 0, it will be * parsed as an octal number. Otherwise it will be parsed as a decimal. * @res: Where to write the result of the conversion on success. * * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. * Used as a replacement for the obsolete simple_strtoull. Return code must * be checked. */
static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res) { /* * We want to shortcut function call, but * __builtin_types_compatible_p(unsigned long, unsigned long long) = 0. */ if (sizeof(unsigned long) == sizeof(unsigned long long) && __alignof__(unsigned long) == __alignof__(unsigned long long)) return kstrtoull(s, base, (unsigned long long *)res); else return _kstrtoul(s, base, res); }

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Alexey Dobriyan7296.00%150.00%
Linus Torvalds (pre-git)34.00%150.00%
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/** * kstrtol - convert a string to a long * @s: The start of the string. The string must be null-terminated, and may also * include a single newline before its terminating null. The first character * may also be a plus sign or a minus sign. * @base: The number base to use. The maximum supported base is 16. If base is * given as 0, then the base of the string is automatically detected with the * conventional semantics - If it begins with 0x the number will be parsed as a * hexadecimal (case insensitive), if it otherwise begins with 0, it will be * parsed as an octal number. Otherwise it will be parsed as a decimal. * @res: Where to write the result of the conversion on success. * * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. * Used as a replacement for the obsolete simple_strtoull. Return code must * be checked. */
static inline int __must_check kstrtol(const char *s, unsigned int base, long *res) { /* * We want to shortcut function call, but * __builtin_types_compatible_p(long, long long) = 0. */ if (sizeof(long) == sizeof(long long) && __alignof__(long) == __alignof__(long long)) return kstrtoll(s, base, (long long *)res); else return _kstrtol(s, base, res); }

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int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res); int __must_check kstrtoint(const char *s, unsigned int base, int *res);
static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res) { return kstrtoull(s, base, res); }

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Alexey Dobriyan2890.32%150.00%
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static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) { return kstrtoll(s, base, res); }

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Alexey Dobriyan31100.00%1100.00%
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static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) { return kstrtouint(s, base, res); }

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Alexey Dobriyan2890.32%150.00%
Linus Torvalds (pre-git)39.68%150.00%
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static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) { return kstrtoint(s, base, res); }

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Alexey Dobriyan31100.00%1100.00%
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int __must_check kstrtou16(const char *s, unsigned int base, u16 *res); int __must_check kstrtos16(const char *s, unsigned int base, s16 *res); int __must_check kstrtou8(const char *s, unsigned int base, u8 *res); int __must_check kstrtos8(const char *s, unsigned int base, s8 *res); int __must_check kstrtobool(const char *s, bool *res); int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res); int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res); int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res); int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res); int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res); int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res); int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res); int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res); int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res); int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res); int __must_check kstrtobool_from_user(const char __user *s, size_t count, bool *res);
static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res) { return kstrtoull_from_user(s, count, base, res); }

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static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res) { return kstrtoll_from_user(s, count, base, res); }

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static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res) { return kstrtouint_from_user(s, count, base, res); }

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static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res) { return kstrtoint_from_user(s, count, base, res); }

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Alexey Dobriyan37100.00%1100.00%
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/* Obsolete, do not use. Use kstrto<foo> instead */ extern unsigned long simple_strtoul(const char *,char **,unsigned int); extern long simple_strtol(const char *,char **,unsigned int); extern unsigned long long simple_strtoull(const char *,char **,unsigned int); extern long long simple_strtoll(const char *,char **,unsigned int); extern int num_to_str(char *buf, int size, unsigned long long num); /* lib/printf utilities */ extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); extern __printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...); extern __printf(3, 0) int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); extern __printf(3, 4) int scnprintf(char *buf, size_t size, const char *fmt, ...); extern __printf(3, 0) int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); extern __printf(2, 3) __malloc char *kasprintf(gfp_t gfp, const char *fmt, ...); extern __printf(2, 0) __malloc char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); extern __printf(2, 0) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); extern __scanf(2, 3) int sscanf(const char *, const char *, ...); extern __scanf(2, 0) int vsscanf(const char *, const char *, va_list); extern int get_option(char **str, int *pint); extern char *get_options(const char *str, int nints, int *ints); extern unsigned long long memparse(const char *ptr, char **retptr); extern bool parse_option_str(const char *str, const char *option); extern char *next_arg(char *args, char **param, char **val); extern int core_kernel_text(unsigned long addr); extern int core_kernel_data(unsigned long addr); extern int __kernel_text_address(unsigned long addr); extern int kernel_text_address(unsigned long addr); extern int func_ptr_is_kernel_text(void *ptr); unsigned long int_sqrt(unsigned long); extern void bust_spinlocks(int yes); extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ extern int panic_timeout; extern int panic_on_oops; extern int panic_on_unrecovered_nmi; extern int panic_on_io_nmi; extern int panic_on_warn; extern int sysctl_panic_on_rcu_stall; extern int sysctl_panic_on_stackoverflow; extern bool crash_kexec_post_notifiers; /* * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It * holds a CPU number which is executing panic() currently. A value of * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). */ extern atomic_t panic_cpu; #define PANIC_CPU_INVALID -1 /* * Only to be used by arch init code. If the user over-wrote the default * CONFIG_PANIC_TIMEOUT, honor it. */
static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) { if (panic_timeout == arch_default_timeout) panic_timeout = timeout; }

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extern const char *print_tainted(void); enum lockdep_ok { LOCKDEP_STILL_OK, LOCKDEP_NOW_UNRELIABLE }; extern void add_taint(unsigned flag, enum lockdep_ok); extern int test_taint(unsigned flag); extern unsigned long get_taint(void); extern int root_mountflags; extern bool early_boot_irqs_disabled; /* * Values used for system_state. Ordering of the states must not be changed * as code checks for <, <=, >, >= STATE. */ extern enum system_states { SYSTEM_BOOTING, SYSTEM_SCHEDULING, SYSTEM_RUNNING, SYSTEM_HALT, SYSTEM_POWER_OFF, SYSTEM_RESTART, } system_state; #define TAINT_PROPRIETARY_MODULE 0 #define TAINT_FORCED_MODULE 1 #define TAINT_CPU_OUT_OF_SPEC 2 #define TAINT_FORCED_RMMOD 3 #define TAINT_MACHINE_CHECK 4 #define TAINT_BAD_PAGE 5 #define TAINT_USER 6 #define TAINT_DIE 7 #define TAINT_OVERRIDDEN_ACPI_TABLE 8 #define TAINT_WARN 9 #define TAINT_CRAP 10 #define TAINT_FIRMWARE_WORKAROUND 11 #define TAINT_OOT_MODULE 12 #define TAINT_UNSIGNED_MODULE 13 #define TAINT_SOFTLOCKUP 14 #define TAINT_LIVEPATCH 15 #define TAINT_FLAGS_COUNT 16 struct taint_flag { char c_true; /* character printed when tainted */ char c_false; /* character printed when not tainted */ bool module; /* also show as a per-module taint flag */ }; extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT]; extern const char hex_asc[]; #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
static inline char *hex_byte_pack(char *buf, u8 byte) { *buf++ = hex_asc_hi(byte); *buf++ = hex_asc_lo(byte); return buf; }

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Linus Torvalds3288.89%133.33%
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extern const char hex_asc_upper[]; #define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] #define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4]
static inline char *hex_byte_pack_upper(char *buf, u8 byte) { *buf++ = hex_asc_upper_hi(byte); *buf++ = hex_asc_upper_lo(byte); return buf; }

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Andre Naujoks36100.00%1100.00%
Total36100.00%1100.00%

extern int hex_to_bin(char ch); extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); extern char *bin2hex(char *dst, const void *src, size_t count); bool mac_pton(const char *s, u8 *mac); /* * General tracing related utility functions - trace_printk(), * tracing_on/tracing_off and tracing_start()/tracing_stop * * Use tracing_on/tracing_off when you want to quickly turn on or off * tracing. It simply enables or disables the recording of the trace events. * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on * file, which gives a means for the kernel and userspace to interact. * Place a tracing_off() in the kernel where you want tracing to end. * From user space, examine the trace, and then echo 1 > tracing_on * to continue tracing. * * tracing_stop/tracing_start has slightly more overhead. It is used * by things like suspend to ram where disabling the recording of the * trace is not enough, but tracing must actually stop because things * like calling smp_processor_id() may crash the system. * * Most likely, you want to use tracing_on/tracing_off. */ enum ftrace_dump_mode { DUMP_NONE, DUMP_ALL, DUMP_ORIG, }; #ifdef CONFIG_TRACING void tracing_on(void); void tracing_off(void); int tracing_is_on(void); void tracing_snapshot(void); void tracing_snapshot_alloc(void); extern void tracing_start(void); extern void tracing_stop(void); static inline __printf(1, 2) void ____trace_printk_check_format(const char *fmt, ...) { } #define __trace_printk_check_format(fmt, args...) \ do { \ if (0) \ ____trace_printk_check_format(fmt, ##args); \ } while (0) /** * trace_printk - printf formatting in the ftrace buffer * @fmt: the printf format for printing * * Note: __trace_printk is an internal function for trace_printk() and * the @ip is passed in via the trace_printk() macro. * * This function allows a kernel developer to debug fast path sections * that printk is not appropriate for. By scattering in various * printk like tracing in the code, a developer can quickly see * where problems are occurring. * * This is intended as a debugging tool for the developer only. * Please refrain from leaving trace_printks scattered around in * your code. (Extra memory is used for special buffers that are * allocated when trace_printk() is used.) * * A little optization trick is done here. If there's only one * argument, there's no need to scan the string for printf formats. * The trace_puts() will suffice. But how can we take advantage of * using trace_puts() when trace_printk() has only one argument? * By stringifying the args and checking the size we can tell * whether or not there are args. __stringify((__VA_ARGS__)) will * turn into "()\0" with a size of 3 when there are no args, anything * else will be bigger. All we need to do is define a string to this, * and then take its size and compare to 3. If it's bigger, use * do_trace_printk() otherwise, optimize it to trace_puts(). Then just * let gcc optimize the rest. */ #define trace_printk(fmt, ...) \ do { \ char _______STR[] = __stringify((__VA_ARGS__)); \ if (sizeof(_______STR) > 3) \ do_trace_printk(fmt, ##__VA_ARGS__); \ else \ trace_puts(fmt); \ } while (0) #define do_trace_printk(fmt, args...) \ do { \ static const char *trace_printk_fmt __used \ __attribute__((section("__trace_printk_fmt"))) = \ __builtin_constant_p(fmt) ? fmt : NULL; \ \ __trace_printk_check_format(fmt, ##args); \ \ if (__builtin_constant_p(fmt)) \ __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ else \ __trace_printk(_THIS_IP_, fmt, ##args); \ } while (0) extern __printf(2, 3) int __trace_bprintk(unsigned long ip, const char *fmt, ...); extern __printf(2, 3) int __trace_printk(unsigned long ip, const char *fmt, ...); /** * trace_puts - write a string into the ftrace buffer * @str: the string to record * * Note: __trace_bputs is an internal function for trace_puts and * the @ip is passed in via the trace_puts macro. * * This is similar to trace_printk() but is made for those really fast * paths that a developer wants the least amount of "Heisenbug" effects, * where the processing of the print format is still too much. * * This function allows a kernel developer to debug fast path sections * that printk is not appropriate for. By scattering in various * printk like tracing in the code, a developer can quickly see * where problems are occurring. * * This is intended as a debugging tool for the developer only. * Please refrain from leaving trace_puts scattered around in * your code. (Extra memory is used for special buffers that are * allocated when trace_puts() is used.) * * Returns: 0 if nothing was written, positive # if string was. * (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) */ #define trace_puts(str) ({ \ static const char *trace_printk_fmt __used \ __attribute__((section("__trace_printk_fmt"))) = \ __builtin_constant_p(str) ? str : NULL; \ \ if (__builtin_constant_p(str)) \ __trace_bputs(_THIS_IP_, trace_printk_fmt); \ else \ __trace_puts(_THIS_IP_, str, strlen(str)); \ }) extern int __trace_bputs(unsigned long ip, const char *str); extern int __trace_puts(unsigned long ip, const char *str, int size); extern void trace_dump_stack(int skip); /* * The double __builtin_constant_p is because gcc will give us an error * if we try to allocate the static variable to fmt if it is not a * constant. Even with the outer if statement. */ #define ftrace_vprintk(fmt, vargs) \ do { \ if (__builtin_constant_p(fmt)) { \ static const char *trace_printk_fmt __used \ __attribute__((section("__trace_printk_fmt"))) = \ __builtin_constant_p(fmt) ? fmt : NULL; \ \ __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ } else \ __ftrace_vprintk(_THIS_IP_, fmt, vargs); \ } while (0) extern __printf(2, 0) int __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); extern __printf(2, 0) int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); #else
static inline void tracing_start(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar8100.00%1100.00%
Total8100.00%1100.00%


static inline void tracing_stop(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar8100.00%1100.00%
Total8100.00%1100.00%


static inline void trace_dump_stack(int skip) { }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt777.78%150.00%
Dhaval Giani222.22%150.00%
Total9100.00%2100.00%


static inline void tracing_on(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt8100.00%1100.00%
Total8100.00%1100.00%


static inline void tracing_off(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt8100.00%1100.00%
Total8100.00%1100.00%


static inline int tracing_is_on(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt12100.00%1100.00%
Total12100.00%1100.00%


static inline void tracing_snapshot(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt8100.00%1100.00%
Total8100.00%1100.00%


static inline void tracing_snapshot_alloc(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt8100.00%1100.00%
Total8100.00%1100.00%

static inline __printf(1, 2) int trace_printk(const char *fmt, ...) { return 0; } static __printf(1, 0) inline int ftrace_vprintk(const char *fmt, va_list ap) { return 0; }
static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar770.00%150.00%
Frédéric Weisbecker330.00%150.00%
Total10100.00%2100.00%

#endif /* CONFIG_TRACING */ /* * min()/max()/clamp() macros that also do * strict type-checking.. See the * "unnecessary" pointer comparison. */ #define __min(t1, t2, min1, min2, x, y) ({ \ t1 min1 = (x); \ t2 min2 = (y); \ (void) (&min1 == &min2); \ min1 < min2 ? min1 : min2; }) /** * min - return minimum of two values of the same or compatible types * @x: first value * @y: second value */ #define min(x, y) \ __min(typeof(x), typeof(y), \ __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ x, y) #define __max(t1, t2, max1, max2, x, y) ({ \ t1 max1 = (x); \ t2 max2 = (y); \ (void) (&max1 == &max2); \ max1 > max2 ? max1 : max2; }) /** * max - return maximum of two values of the same or compatible types * @x: first value * @y: second value */ #define max(x, y) \ __max(typeof(x), typeof(y), \ __UNIQUE_ID(max1_), __UNIQUE_ID(max2_), \ x, y) /** * min3 - return minimum of three values * @x: first value * @y: second value * @z: third value */ #define min3(x, y, z) min((typeof(x))min(x, y), z) /** * max3 - return maximum of three values * @x: first value * @y: second value * @z: third value */ #define max3(x, y, z) max((typeof(x))max(x, y), z) /** * min_not_zero - return the minimum that is _not_ zero, unless both are zero * @x: value1 * @y: value2 */ #define min_not_zero(x, y) ({ \ typeof(x) __x = (x); \ typeof(y) __y = (y); \ __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) /** * clamp - return a value clamped to a given range with strict typechecking * @val: current value * @lo: lowest allowable value * @hi: highest allowable value * * This macro does strict typechecking of @lo/@hi to make sure they are of the * same type as @val. See the unnecessary pointer comparisons. */ #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) /* * ..and if you can't take the strict * types, you can specify one yourself. * * Or not use min/max/clamp at all, of course. */ /** * min_t - return minimum of two values, using the specified type * @type: data type to use * @x: first value * @y: second value */ #define min_t(type, x, y) \ __min(type, type, \ __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ x, y) /** * max_t - return maximum of two values, using the specified type * @type: data type to use * @x: first value * @y: second value */ #define max_t(type, x, y) \ __max(type, type, \ __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \ x, y) /** * clamp_t - return a value clamped to a given range using a given type * @type: the type of variable to use * @val: current value * @lo: minimum allowable value * @hi: maximum allowable value * * This macro does no typechecking and uses temporary variables of type * @type to make all the comparisons. */ #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) /** * clamp_val - return a value clamped to a given range using val's type * @val: current value * @lo: minimum allowable value * @hi: maximum allowable value * * This macro does no typechecking and uses temporary variables of whatever * type the input argument @val is. This is useful when @val is an unsigned * type and @lo and @hi are literals that will otherwise be assigned a signed * integer type. */ #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) /** * swap - swap values of @a and @b * @a: first value * @b: second value */ #define swap(a, b) \ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) /** * container_of - cast a member of a structure out to the containing structure * @ptr: the pointer to the member. * @type: the type of the container struct this is embedded in. * @member: the name of the member within the struct. * */ #define container_of(ptr, type, member) ({ \ void *__mptr = (void *)(ptr); \ BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ !__same_type(*(ptr), void), \ "pointer type mismatch in container_of()"); \ ((type *)(__mptr - offsetof(type, member))); }) /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ #ifdef CONFIG_FTRACE_MCOUNT_RECORD # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD #endif /* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ #define VERIFY_OCTAL_PERMISSIONS(perms) \ (BUILD_BUG_ON_ZERO((perms) < 0) + \ BUILD_BUG_ON_ZERO((perms) > 0777) + \ /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ /* USER_WRITABLE >= GROUP_WRITABLE */ \ BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ /* OTHER_WRITABLE? Generally considered a bad idea. */ \ BUILD_BUG_ON_ZERO((perms) & 2) + \ (perms)) #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan80526.12%52.48%
Linus Torvalds2397.75%104.95%
Linus Torvalds (pre-git)2006.49%2110.40%
Steven Rostedt1504.87%115.45%
Ingo Molnar1444.67%41.98%
Joe Perches1183.83%104.95%
Andrew Morton1093.54%115.45%
Frédéric Weisbecker852.76%62.97%
Kees Cook692.24%20.99%
Andre Naujoks561.82%10.50%
Yi Yang521.69%10.50%
Alex Elder481.56%10.50%
Peter Zijlstra461.49%41.98%
Johannes Berg421.36%10.50%
Rusty Russell381.23%62.97%
Nicholas Bellinger351.14%10.50%
David Howells321.04%41.98%
Jeremy Fitzhardinge311.01%31.49%
Daniel Borkmann300.97%10.50%
Yinghai Lu280.91%10.50%
Petr Mladek280.91%10.50%
Harvey Harrison280.91%10.50%
Jens Axboe270.88%10.50%
Jason Baron260.84%20.99%
Kamezawa Hiroyuki250.81%20.99%
Michal Nazarewicz240.78%31.49%
Nicolas Iooss230.75%10.50%
Rasmus Villemoes230.75%20.99%
Hidehiro Kawai230.75%31.49%
Baoquan He200.65%10.50%
Hagen Paul Pfeifer200.65%10.50%
Randy Dunlap190.62%31.49%
Mimi Zohar180.58%20.99%
Dave Young180.58%20.99%
Nicholas Piggin160.52%10.50%
Andi Kleen160.52%20.99%
David Hildenbrand130.42%10.50%
Andy Shevchenko130.42%20.99%
Hirofumi Ogawa120.39%10.50%
Michal Hocko120.39%10.50%
Salman Qazi120.39%10.50%
Martin Waitz110.36%10.50%
Michael S. Tsirkin110.36%10.50%
Masahiro Yamada110.36%10.50%
Neil Brown100.32%10.50%
Martin K. Petersen100.32%10.50%
Javi Merino100.32%10.50%
Eric Paris90.29%10.50%
Krzysztof Kozlowski90.29%10.50%
Jan Beulich90.29%10.50%
Arnaud Lacombe90.29%10.50%
Arjan van de Ven90.29%10.50%
Matt Mackall90.29%20.99%
Trent Piepho90.29%10.50%
Christoph Hellwig90.29%10.50%
Matthew Wilcox90.29%10.50%
Axel Lin80.26%10.50%
Darrick J. Wong80.26%10.50%
Fengguang Wu80.26%10.50%
Eduard - Gabriel Munteanu80.26%10.50%
Joerg Roedel80.26%10.50%
David S. Miller70.23%10.50%
Yanmin Zhang70.23%10.50%
Gustavo Fernando Padovan70.23%10.50%
Gobinda Charan Maji70.23%10.50%
Anton Blanchard60.19%10.50%
Mathieu Desnoyers40.13%10.50%
Prarit Bhargava40.13%10.50%
Ian Abbott40.13%10.50%
Tejun Heo40.13%10.50%
Xi Wang40.13%10.50%
Seth Jennings40.13%10.50%
Ben Hutchings40.13%10.50%
Joshua Hunt40.13%10.50%
Daniel Bristot de Oliveira40.13%10.50%
Daisuke Hatayama40.13%10.50%
Mitsuo Hayasaka40.13%10.50%
Steven Whitehouse30.10%10.50%
Thomas Gleixner30.10%10.50%
Ryan Cumming30.10%10.50%
Herbert Xu30.10%20.99%
Harald Welte30.10%10.50%
Neil Horman30.10%10.50%
Dan Rosenberg20.06%10.50%
Michael Ellerman20.06%10.50%
Tamuki Shoichi20.06%10.50%
Dhaval Giani20.06%10.50%
Simon Kågström20.06%10.50%
Américo Wang20.06%10.50%
Eldad Zack20.06%10.50%
Larry Finger20.06%10.50%
H. Peter Anvin20.06%10.50%
Tetsuo Handa10.03%10.50%
Hua Zhong10.03%10.50%
Alan Stern10.03%10.50%
zijun_hu10.03%10.50%
Nicolas Dichtel10.03%10.50%
Greg Kroah-Hartman10.03%10.50%
Bartlomiej Zolnierkiewicz10.03%10.50%
Niklas Söderlund10.03%10.50%
James Morris10.03%10.50%
GeunSik Lim10.03%10.50%
Dave Jones10.03%10.50%
Total3082100.00%202100.00%
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