diff options
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 755 |
1 files changed, 755 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h new file mode 100644 index 00000000..da3e76d0 --- /dev/null +++ b/include/linux/kernel.h @@ -0,0 +1,755 @@ +#ifndef _LINUX_KERNEL_H +#define _LINUX_KERNEL_H + +/* + * 'kernel.h' contains some often-used function prototypes etc + */ +#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) +#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) + +#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/printk.h> +#include <linux/dynamic_debug.h> +#include <asm/byteorder.h> +#include <asm/bug.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 STACK_MAGIC 0xdeadbeef + +#define ALIGN(x, a) __ALIGN_KERNEL((x), (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) + +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) + +/* + * 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)) + +#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) +#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) + +/* 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)); \ +} \ +) +#define DIV_ROUND_CLOSEST(x, divisor)( \ +{ \ + typeof(divisor) __divisor = divisor; \ + (((x) + ((__divisor) / 2)) / (__divisor)); \ +} \ +) + +/* + * 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_SPINLOCK_SLEEP + 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) +#else + static inline void __might_sleep(const 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) + +/* + * abs() handles unsigned and signed longs, ints, shorts and chars. For all + * input types abs() returns a signed long. + * abs() should not be used for 64-bit types (s64, u64, long long) - use abs64() + * for those. + */ +#define abs(x) ({ \ + long ret; \ + if (sizeof(x) == sizeof(long)) { \ + long __x = (x); \ + ret = (__x < 0) ? -__x : __x; \ + } else { \ + int __x = (x); \ + ret = (__x < 0) ? -__x : __x; \ + } \ + ret; \ + }) + +#define abs64(x) ({ \ + s64 __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)(int state); +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); +void print_oops_end_marker(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; + +/* 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); +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); +} + +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); +} + +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); +} + +static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res) +{ + return kstrtoll(s, base, res); +} + +static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res) +{ + return kstrtouint(s, base, res); +} + +static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res) +{ + return kstrtoint(s, base, res); +} + +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 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); + +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); +} + +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); +} + +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); +} + +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); +} + +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); +#define strict_strtoul kstrtoul +#define strict_strtol kstrtol +#define strict_strtoull kstrtoull +#define strict_strtoll kstrtoll + +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 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); + +struct pid; +extern struct pid *session_of_pgrp(struct pid *pgrp); + +unsigned long int_sqrt(unsigned long); + +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; + +extern bool early_boot_irqs_disabled; + +/* 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 +#define TAINT_FIRMWARE_WORKAROUND 11 + +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; +} + +extern int hex_to_bin(char ch); +extern void hex2bin(u8 *dst, const char *src, size_t count); + +/* + * 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 + +enum ftrace_dump_mode { + DUMP_NONE, + DUMP_ALL, + DUMP_ORIG, +}; + +#ifdef CONFIG_TRACING +extern void tracing_start(void); +extern void tracing_stop(void); +extern void ftrace_off_permanent(void); + +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(enum ftrace_dump_mode oops_dump_mode); +#else +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(enum ftrace_dump_mode oops_dump_mode) { } +#endif /* CONFIG_TRACING */ + +/* + * 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; }) + +#define min3(x, y, z) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + typeof(z) _min3 = (z); \ + (void) (&_min1 == &_min2); \ + (void) (&_min1 == &_min3); \ + _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \ + (_min2 < _min3 ? _min2 : _min3); }) + +#define max3(x, y, z) ({ \ + typeof(x) _max1 = (x); \ + typeof(y) _max2 = (y); \ + typeof(z) _max3 = (z); \ + (void) (&_max1 == &_max2); \ + (void) (&_max1 == &_max3); \ + _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \ + (_max2 > _max3 ? _max2 : _max3); }) + +/** + * 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 + * @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__ */ + +#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.. */ +}; + +#ifdef __CHECKER__ +#define BUILD_BUG_ON_NOT_POWER_OF_2(n) +#define BUILD_BUG_ON_ZERO(e) (0) +#define BUILD_BUG_ON_NULL(e) ((void*)0) +#define BUILD_BUG_ON(condition) +#else /* __CHECKER__ */ + +/* Force a compilation error if a constant expression is not a power of 2 */ +#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ + BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) + +/* 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); })) + +/** + * BUILD_BUG_ON - break compile if a condition is true. + * @condition: the condition which the compiler should know is false. + * + * If you have some code which relies on certain constants being equal, or + * other compile-time-evaluated condition, you should use BUILD_BUG_ON to + * detect if someone changes it. + * + * The implementation uses gcc's reluctance to create a negative array, but + * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments + * to inline functions). So as a fallback we use the optimizer; if it can't + * prove the condition is false, it will cause a link error on the undefined + * "__build_bug_on_failed". This error message can be harder to track down + * though, hence the two different methods. + */ +#ifndef __OPTIMIZE__ +#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) +#else +extern int __build_bug_on_failed; +#define BUILD_BUG_ON(condition) \ + do { \ + ((void)sizeof(char[1 - 2*!!(condition)])); \ + if (condition) __build_bug_on_failed = 1; \ + } while(0) +#endif +#endif /* __CHECKER__ */ + +/* 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 + +/* This helps us avoid #ifdef CONFIG_COMPACTION */ +#ifdef CONFIG_COMPACTION +#define COMPACTION_BUILD 1 +#else +#define COMPACTION_BUILD 0 +#endif + +/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ +#ifdef CONFIG_FTRACE_MCOUNT_RECORD +# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD +#endif + +/* To identify board information in panic logs, set this */ +extern char *mach_panic_string; + +#endif |