mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Kurt Garloff](/assets/img/avatar_default.png)
This patch introduces a new sysctl: /proc/sys/kernel/panic_on_io_nmi which defaults to 0 (off). When enabled, the kernel panics when the kernel receives an NMI caused by an IO error. The IO error triggered NMI indicates a serious system condition, which could result in IO data corruption. Rather than contiuing, panicing and dumping might be a better choice, so one can figure out what's causing the IO error. This could be especially important to companies running IO intensive applications where corruption must be avoided, e.g. a bank's databases. [ SuSE has been shipping it for a while, it was done at the request of a large database vendor, for their users. ] Signed-off-by: Kurt Garloff <garloff@suse.de> Signed-off-by: Roberto Angelino <robertangelino@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> LKML-Reference: <20090624213211.GA11291@kroah.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
701 lines
21 KiB
C
701 lines
21 KiB
C
#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/ratelimit.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);
|
|
/**
|
|
* 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__); might_resched(); } while (0)
|
|
#else
|
|
# define might_sleep() do { might_resched(); } while (0)
|
|
#endif
|
|
|
|
#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
|
|
|
|
#define abs(x) ({ \
|
|
int __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 struct ratelimit_state printk_ratelimit_state;
|
|
extern int printk_ratelimit(void);
|
|
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
|
|
unsigned int interval_msec);
|
|
|
|
/*
|
|
* Print a one-time message (analogous to WARN_ONCE() et al):
|
|
*/
|
|
#define printk_once(x...) ({ \
|
|
static int __print_once = 1; \
|
|
\
|
|
if (__print_once) { \
|
|
__print_once = 0; \
|
|
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)));
|
|
|
|
/*
|
|
* 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 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__ */
|
|
|
|
#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)sizeof(char[1 - 2*!!(condition)]))
|
|
|
|
/* 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(char[1 - 2 * !!(e)]) - 1)
|
|
|
|
/* 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
|