include/linux/kernel.h: Move logging bits to include/linux/printk.h

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / kernel.h

#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))
#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));      \
}                                                       \
)

#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)

#define abs(x) ({                               \
                long __x = (x);                 \
                (__x < 0) ? -__x : __x;         \
        })

#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;
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 __must_check strict_strtoul(const char *, unsigned int, unsigned long *);
extern int __must_check strict_strtol(const char *, unsigned int, long *);
extern int __must_check strict_strtoull(const char *, unsigned int, unsigned long long *);
extern int __must_check 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);

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;

/* 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);

/*
 * 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.. */
};

/* 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 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); }))

/* 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