| #ifndef _LINUX_KERNEL_H |
| #define _LINUX_KERNEL_H |
| |
| /* |
| * 'kernel.h' contains some often-used function prototypes etc |
| */ |
| |
| #ifdef __KERNEL__ |
| |
| #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/dynamic_debug.h> |
| #include <asm/byteorder.h> |
| #include <asm/bug.h> |
| |
| extern const char linux_banner[]; |
| extern const char linux_proc_banner[]; |
| |
| #define USHORT_MAX ((u16)(~0U)) |
| #define SHORT_MAX ((s16)(USHORT_MAX>>1)) |
| #define SHORT_MIN (-SHORT_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 STACK_MAGIC 0xdeadbeef |
| |
| #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
| #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
| #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
| |
| #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
| |
| #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
| #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
| #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
| #define DIV_ROUND_CLOSEST(x, divisor)( \ |
| { \ |
| typeof(divisor) __divisor = divisor; \ |
| (((x) + ((__divisor) / 2)) / (__divisor)); \ |
| } \ |
| ) |
| |
| #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)) |
| |
| #define KERN_EMERG "<0>" /* system is unusable */ |
| #define KERN_ALERT "<1>" /* action must be taken immediately */ |
| #define KERN_CRIT "<2>" /* critical conditions */ |
| #define KERN_ERR "<3>" /* error conditions */ |
| #define KERN_WARNING "<4>" /* warning conditions */ |
| #define KERN_NOTICE "<5>" /* normal but significant condition */ |
| #define KERN_INFO "<6>" /* informational */ |
| #define KERN_DEBUG "<7>" /* debug-level messages */ |
| |
| /* Use the default kernel loglevel */ |
| #define KERN_DEFAULT "<d>" |
| /* |
| * Annotation for a "continued" line of log printout (only done after a |
| * line that had no enclosing \n). Only to be used by core/arch code |
| * during early bootup (a continued line is not SMP-safe otherwise). |
| */ |
| #define KERN_CONT "<c>" |
| |
| extern int console_printk[]; |
| |
| #define console_loglevel (console_printk[0]) |
| #define default_message_loglevel (console_printk[1]) |
| #define minimum_console_loglevel (console_printk[2]) |
| #define default_console_loglevel (console_printk[3]) |
| |
| 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_SPINLOCK_SLEEP |
| void __might_sleep(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) |
| #else |
| static inline void __might_sleep(char *file, int line, int preempt_offset) { } |
| # define might_sleep() do { might_resched(); } while (0) |
| #endif |
| |
| #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
| |
| #define abs(x) ({ \ |
| long __x = (x); \ |
| (__x < 0) ? -__x : __x; \ |
| }) |
| |
| #ifdef CONFIG_PROVE_LOCKING |
| void might_fault(void); |
| #else |
| static inline void might_fault(void) |
| { |
| might_sleep(); |
| } |
| #endif |
| |
| extern struct atomic_notifier_head panic_notifier_list; |
| extern long (*panic_blink)(long time); |
| NORET_TYPE void panic(const char * fmt, ...) |
| __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
| extern void oops_enter(void); |
| extern void oops_exit(void); |
| extern int oops_may_print(void); |
| NORET_TYPE void do_exit(long error_code) |
| ATTRIB_NORET; |
| NORET_TYPE void complete_and_exit(struct completion *, long) |
| ATTRIB_NORET; |
| 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 strict_strtoul(const char *, unsigned int, unsigned long *); |
| extern int strict_strtol(const char *, unsigned int, long *); |
| extern int strict_strtoull(const char *, unsigned int, unsigned long long *); |
| extern int strict_strtoll(const char *, unsigned int, long long *); |
| extern int sprintf(char * buf, const char * fmt, ...) |
| __attribute__ ((format (printf, 2, 3))); |
| extern int vsprintf(char *buf, const char *, va_list) |
| __attribute__ ((format (printf, 2, 0))); |
| extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| __attribute__ ((format (printf, 3, 0))); |
| extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| __attribute__ ((format (printf, 3, 0))); |
| extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
| __attribute__ ((format (printf, 2, 3))); |
| extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
| |
| extern int sscanf(const char *, const char *, ...) |
| __attribute__ ((format (scanf, 2, 3))); |
| extern int vsscanf(const char *, const char *, va_list) |
| __attribute__ ((format (scanf, 2, 0))); |
| |
| 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 int core_kernel_text(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); |
| |
| struct pid; |
| extern struct pid *session_of_pgrp(struct pid *pgrp); |
| |
| /* |
| * FW_BUG |
| * Add this to a message where you are sure the firmware is buggy or behaves |
| * really stupid or out of spec. Be aware that the responsible BIOS developer |
| * should be able to fix this issue or at least get a concrete idea of the |
| * problem by reading your message without the need of looking at the kernel |
| * code. |
| * |
| * Use it for definite and high priority BIOS bugs. |
| * |
| * FW_WARN |
| * Use it for not that clear (e.g. could the kernel messed up things already?) |
| * and medium priority BIOS bugs. |
| * |
| * FW_INFO |
| * Use this one if you want to tell the user or vendor about something |
| * suspicious, but generally harmless related to the firmware. |
| * |
| * Use it for information or very low priority BIOS bugs. |
| */ |
| #define FW_BUG "[Firmware Bug]: " |
| #define FW_WARN "[Firmware Warn]: " |
| #define FW_INFO "[Firmware Info]: " |
| |
| #ifdef CONFIG_PRINTK |
| asmlinkage int vprintk(const char *fmt, va_list args) |
| __attribute__ ((format (printf, 1, 0))); |
| asmlinkage int printk(const char * fmt, ...) |
| __attribute__ ((format (printf, 1, 2))) __cold; |
| |
| extern int __printk_ratelimit(const char *func); |
| #define printk_ratelimit() __printk_ratelimit(__func__) |
| extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, |
| unsigned int interval_msec); |
| |
| extern int printk_delay_msec; |
| |
| /* |
| * Print a one-time message (analogous to WARN_ONCE() et al): |
| */ |
| #define printk_once(x...) ({ \ |
| static bool __print_once = true; \ |
| \ |
| if (__print_once) { \ |
| __print_once = false; \ |
| printk(x); \ |
| } \ |
| }) |
| |
| void log_buf_kexec_setup(void); |
| #else |
| static inline int vprintk(const char *s, va_list args) |
| __attribute__ ((format (printf, 1, 0))); |
| static inline int vprintk(const char *s, va_list args) { return 0; } |
| static inline int printk(const char *s, ...) |
| __attribute__ ((format (printf, 1, 2))); |
| static inline int __cold printk(const char *s, ...) { return 0; } |
| static inline int printk_ratelimit(void) { return 0; } |
| static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ |
| unsigned int interval_msec) \ |
| { return false; } |
| |
| /* No effect, but we still get type checking even in the !PRINTK case: */ |
| #define printk_once(x...) printk(x) |
| |
| static inline void log_buf_kexec_setup(void) |
| { |
| } |
| #endif |
| |
| extern int printk_needs_cpu(int cpu); |
| extern void printk_tick(void); |
| |
| extern void asmlinkage __attribute__((format(printf, 1, 2))) |
| early_printk(const char *fmt, ...); |
| |
| unsigned long int_sqrt(unsigned long); |
| |
| static inline void console_silent(void) |
| { |
| console_loglevel = 0; |
| } |
| |
| static inline void console_verbose(void) |
| { |
| if (console_loglevel) |
| console_loglevel = 15; |
| } |
| |
| extern void bust_spinlocks(int yes); |
| extern void wake_up_klogd(void); |
| 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 const char *print_tainted(void); |
| extern void add_taint(unsigned flag); |
| extern int test_taint(unsigned flag); |
| extern unsigned long get_taint(void); |
| extern int root_mountflags; |
| |
| /* Values used for system_state */ |
| extern enum system_states { |
| SYSTEM_BOOTING, |
| SYSTEM_RUNNING, |
| SYSTEM_HALT, |
| SYSTEM_POWER_OFF, |
| SYSTEM_RESTART, |
| SYSTEM_SUSPEND_DISK, |
| } system_state; |
| |
| #define TAINT_PROPRIETARY_MODULE 0 |
| #define TAINT_FORCED_MODULE 1 |
| #define TAINT_UNSAFE_SMP 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 |
| |
| extern void dump_stack(void) __cold; |
| |
| enum { |
| DUMP_PREFIX_NONE, |
| DUMP_PREFIX_ADDRESS, |
| DUMP_PREFIX_OFFSET |
| }; |
| extern void hex_dump_to_buffer(const void *buf, size_t len, |
| int rowsize, int groupsize, |
| char *linebuf, size_t linebuflen, bool ascii); |
| extern void print_hex_dump(const char *level, const char *prefix_str, |
| int prefix_type, int rowsize, int groupsize, |
| const void *buf, size_t len, bool ascii); |
| extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
| const void *buf, size_t len); |
| |
| 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 *pack_hex_byte(char *buf, u8 byte) |
| { |
| *buf++ = hex_asc_hi(byte); |
| *buf++ = hex_asc_lo(byte); |
| return buf; |
| } |
| |
| #ifndef pr_fmt |
| #define pr_fmt(fmt) fmt |
| #endif |
| |
| #define pr_emerg(fmt, ...) \ |
| printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_alert(fmt, ...) \ |
| printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_crit(fmt, ...) \ |
| printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_err(fmt, ...) \ |
| printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_warning(fmt, ...) \ |
| printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_notice(fmt, ...) \ |
| printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_info(fmt, ...) \ |
| printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) |
| #define pr_cont(fmt, ...) \ |
| printk(KERN_CONT fmt, ##__VA_ARGS__) |
| |
| /* pr_devel() should produce zero code unless DEBUG is defined */ |
| #ifdef DEBUG |
| #define pr_devel(fmt, ...) \ |
| printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
| #else |
| #define pr_devel(fmt, ...) \ |
| ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
| #endif |
| |
| /* If you are writing a driver, please use dev_dbg instead */ |
| #if defined(DEBUG) |
| #define pr_debug(fmt, ...) \ |
| printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
| #elif defined(CONFIG_DYNAMIC_DEBUG) |
| /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ |
| #define pr_debug(fmt, ...) do { \ |
| dynamic_pr_debug(fmt, ##__VA_ARGS__); \ |
| } while (0) |
| #else |
| #define pr_debug(fmt, ...) \ |
| ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; }) |
| #endif |
| |
| /* |
| * 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. |
| */ |
| #ifdef CONFIG_RING_BUFFER |
| void tracing_on(void); |
| void tracing_off(void); |
| /* trace_off_permanent stops recording with no way to bring it back */ |
| void tracing_off_permanent(void); |
| int tracing_is_on(void); |
| #else |
| static inline void tracing_on(void) { } |
| static inline void tracing_off(void) { } |
| static inline void tracing_off_permanent(void) { } |
| static inline int tracing_is_on(void) { return 0; } |
| #endif |
| #ifdef CONFIG_TRACING |
| extern void tracing_start(void); |
| extern void tracing_stop(void); |
| extern void ftrace_off_permanent(void); |
| |
| extern void |
| ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); |
| |
| static inline void __attribute__ ((format (printf, 1, 2))) |
| ____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. |
| */ |
| |
| #define trace_printk(fmt, args...) \ |
| do { \ |
| __trace_printk_check_format(fmt, ##args); \ |
| if (__builtin_constant_p(fmt)) { \ |
| static const char *trace_printk_fmt \ |
| __attribute__((section("__trace_printk_fmt"))) = \ |
| __builtin_constant_p(fmt) ? fmt : NULL; \ |
| \ |
| __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
| } else \ |
| __trace_printk(_THIS_IP_, fmt, ##args); \ |
| } while (0) |
| |
| extern int |
| __trace_bprintk(unsigned long ip, const char *fmt, ...) |
| __attribute__ ((format (printf, 2, 3))); |
| |
| extern int |
| __trace_printk(unsigned long ip, const char *fmt, ...) |
| __attribute__ ((format (printf, 2, 3))); |
| |
| extern void trace_dump_stack(void); |
| |
| /* |
| * 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 \ |
| __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 int |
| __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
| |
| extern int |
| __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
| |
| extern void ftrace_dump(void); |
| #else |
| static inline void |
| ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } |
| static inline int |
| trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |
| |
| static inline void tracing_start(void) { } |
| static inline void tracing_stop(void) { } |
| static inline void ftrace_off_permanent(void) { } |
| static inline void trace_dump_stack(void) { } |
| static inline int |
| trace_printk(const char *fmt, ...) |
| { |
| return 0; |
| } |
| static inline int |
| ftrace_vprintk(const char *fmt, va_list ap) |
| { |
| return 0; |
| } |
| static inline void ftrace_dump(void) { } |
| #endif /* CONFIG_TRACING */ |
| |
| /* |
| * Display an IP address in readable format. |
| */ |
| |
| #define NIPQUAD(addr) \ |
| ((unsigned char *)&addr)[0], \ |
| ((unsigned char *)&addr)[1], \ |
| ((unsigned char *)&addr)[2], \ |
| ((unsigned char *)&addr)[3] |
| #define NIPQUAD_FMT "%u.%u.%u.%u" |
| |
| /* |
| * min()/max()/clamp() macros that also do |
| * strict type-checking.. See the |
| * "unnecessary" pointer comparison. |
| */ |
| #define min(x, y) ({ \ |
| typeof(x) _min1 = (x); \ |
| typeof(y) _min2 = (y); \ |
| (void) (&_min1 == &_min2); \ |
| _min1 < _min2 ? _min1 : _min2; }) |
| |
| #define max(x, y) ({ \ |
| typeof(x) _max1 = (x); \ |
| typeof(y) _max2 = (y); \ |
| (void) (&_max1 == &_max2); \ |
| _max1 > _max2 ? _max1 : _max2; }) |
| |
| /** |
| * clamp - return a value clamped to a given range with strict typechecking |
| * @val: current value |
| * @min: minimum allowable value |
| * @max: maximum allowable value |
| * |
| * This macro does strict typechecking of min/max to make sure they are of the |
| * same type as val. See the unnecessary pointer comparisons. |
| */ |
| #define clamp(val, min, max) ({ \ |
| typeof(val) __val = (val); \ |
| typeof(min) __min = (min); \ |
| typeof(max) __max = (max); \ |
| (void) (&__val == &__min); \ |
| (void) (&__val == &__max); \ |
| __val = __val < __min ? __min: __val; \ |
| __val > __max ? __max: __val; }) |
| |
| /* |
| * ..and if you can't take the strict |
| * types, you can specify one yourself. |
| * |
| * Or not use min/max/clamp at all, of course. |
| */ |
| #define min_t(type, x, y) ({ \ |
| type __min1 = (x); \ |
| type __min2 = (y); \ |
| __min1 < __min2 ? __min1: __min2; }) |
| |
| #define max_t(type, x, y) ({ \ |
| type __max1 = (x); \ |
| type __max2 = (y); \ |
| __max1 > __max2 ? __max1: __max2; }) |
| |
| /** |
| * clamp_t - return a value clamped to a given range using a given type |
| * @type: the type of variable to use |
| * @val: current value |
| * @min: minimum allowable value |
| * @max: 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, min, max) ({ \ |
| type __val = (val); \ |
| type __min = (min); \ |
| type __max = (max); \ |
| __val = __val < __min ? __min: __val; \ |
| __val > __max ? __max: __val; }) |
| |
| /** |
| * clamp_val - return a value clamped to a given range using val's type |
| * @val: current value |
| * @min: minimum allowable value |
| * @max: 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 min and max are literals that will otherwise be assigned a signed |
| * integer type. |
| */ |
| #define clamp_val(val, min, max) ({ \ |
| typeof(val) __val = (val); \ |
| typeof(val) __min = (min); \ |
| typeof(val) __max = (max); \ |
| __val = __val < __min ? __min: __val; \ |
| __val > __max ? __max: __val; }) |
| |
| |
| /* |
| * swap - swap value of @a and @b |
| */ |
| #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) ({ \ |
| const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| (type *)( (char *)__mptr - offsetof(type,member) );}) |
| |
| struct sysinfo; |
| extern int do_sysinfo(struct sysinfo *info); |
| |
| #endif /* __KERNEL__ */ |
| |
| #ifndef __EXPORTED_HEADERS__ |
| #ifndef __KERNEL__ |
| #warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders |
| #endif /* __KERNEL__ */ |
| #endif /* __EXPORTED_HEADERS__ */ |
| |
| #define SI_LOAD_SHIFT 16 |
| struct sysinfo { |
| long uptime; /* Seconds since boot */ |
| unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| unsigned long totalram; /* Total usable main memory size */ |
| unsigned long freeram; /* Available memory size */ |
| unsigned long sharedram; /* Amount of shared memory */ |
| unsigned long bufferram; /* Memory used by buffers */ |
| unsigned long totalswap; /* Total swap space size */ |
| unsigned long freeswap; /* swap space still available */ |
| unsigned short procs; /* Number of current processes */ |
| unsigned short pad; /* explicit padding for m68k */ |
| unsigned long totalhigh; /* Total high memory size */ |
| unsigned long freehigh; /* Available high memory size */ |
| unsigned int mem_unit; /* Memory unit size in bytes */ |
| char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| }; |
| |
| /* Force a compilation error if condition is true */ |
| #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) |
| |
| /* Force a compilation error if condition is constant and true */ |
| #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) |
| |
| /* Force a compilation error if condition is true, but also produce a |
| result (of value 0 and type size_t), so the expression can be used |
| e.g. in a structure initializer (or where-ever else comma expressions |
| aren't permitted). */ |
| #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
| #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
| |
| /* Trap pasters of __FUNCTION__ at compile-time */ |
| #define __FUNCTION__ (__func__) |
| |
| /* This helps us to avoid #ifdef CONFIG_NUMA */ |
| #ifdef CONFIG_NUMA |
| #define NUMA_BUILD 1 |
| #else |
| #define NUMA_BUILD 0 |
| #endif |
| |
| /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
| #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
| #endif |
| |
| #endif |