a0ad05c75a
The idea is to add this to printk after the severity:
printk(KERN_ERR FW_BUG "This is not our fault, BIOS developer: fix it by
simply add ...\n");
If a Firmware issue should be hidden, because it is
work-arounded, but you still want to see something popping up e.g.
for info only:
printk(KERN_INFO FW_INFO "This is done stupid, we can handle it,
but it should better be avoided in future\n");
or on the Linuxfirmwarekit to tell vendors that they did something
stupid or wrong without bothering the user:
printk(KERN_INFO FW_BUG "This is done stupid, we can handle it,
but it should better be avoided in future\n");
Some use cases:
- If a user sees a [Firmware Bug] message in the kernel
he should first update the BIOS before wasting time with
debugging and submiting on old firmware code to mailing
lists.
- The linuxfirmwarekit (http://www.linuxfirmwarekit.org)
tries to detect firmware bugs. It currently is doing that
in userspace which results in:
- Huge test scripts that could be a one liner in the kernel
- A lot of BIOS bugs are already absorbed by the kernel
What do we need such a stupid linuxfirmwarekit for?
- Vendors: Can test their BIOSes for Linux compatibility.
There will be the time when vendors realize that the test utils
on Linux are more strict and using them increases the qualitity
and stability of their products.
- Vendors: Can easily fix up their BIOSes and be more Linux
compatible by:
dmesg |grep "Firmware Bug"
and send the result to their BIOS developer colleagues who should
know what the messages are about and how to fix them, without
the need of studying kernel code.
- Distributions: can do a first automated HW/BIOS checks.
This can then be done without the need of asking kernel developers
who need to dig down the code and explain the details.
Certification can/will just be rejected until
dmesg |grep "Firmware Bug" is empty.
- Thus this can be used as an instrument to enforce cleaner BIOS
code. Currently every stupid Windows ACPI bug is
re-implemented in Linux which is a rather unfortunate situation.
We already have the power to avoid this in e.g. memory
or cpu hot-plug ACPI implementations, because Linux certification
is a must for most vendors in the server area.
Working towards being able to do that in the laptop area
(vendors are starting to look at Linux here also and will use this tool)
is the goal. At least provide them a tool to make it as easy
for this guys (e.g. not needing to browse kernel code) as possible.
- The ordinary Linux user: can go into the next shop, boots the
firmwarekit on his most preferred machines. He chooses one without
BIOS bugs. Unsupported HW is ok, he likes to try out latest projects
which might support them or likes to dig on it on his own, but he
hates to workaround broken BIOSes like hell.
I double checked with the firmwarekit.
There they have:
So the mapping generally is (also depending on how likely the BIOS is
to blame, this could sometimes be difficult):
FW_INFO = INFO
FW_WARN = WARN
FW_BUG = FAIL
For more info about the linuxfirmwarekit and why this is needed
can be found here:
http://www.linuxfirmwarekit.org
While severity matches with the firmwarekit, it might be tricky
to hide messages from the user.
E.g. we recently found out that on HP BIOSes negative temperatures
are returned, which seem to indicate that the thermal zone is
invalid.
We can work around that gracefully by ignoring the thermal zone
and we do not want to bother the ordinary user with a frightening
message: Firmware Bug: thermal management absolutely broken
but want to hide it from the user.
But in the linuxfirmwarekit this should be shown as a real
show stopper (the temperatures could really be wrong,
broken thermal management is one of the worst things
that can happen and the BIOS guys of the machine must
implement this properly).
It is intended to do that (hide it from the user with
KERN_INFO msg, but still print it as a BIOS bug) by:
printk(KERN_INFO FW_BUG "Negativ temperature values detected.
Try to workarounded, BIOS must get fixed\n");
Hope that works out..., no idea how to better hide it
as printk is the only way to easily provide this functionality.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
514 lines
16 KiB
C
514 lines
16 KiB
C
#ifndef _LINUX_KERNEL_H
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#define _LINUX_KERNEL_H
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/*
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* 'kernel.h' contains some often-used function prototypes etc
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*/
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#ifdef __KERNEL__
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#include <stdarg.h>
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#include <linux/linkage.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/bitops.h>
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#include <linux/log2.h>
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#include <linux/typecheck.h>
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#include <linux/ratelimit.h>
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#include <asm/byteorder.h>
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#include <asm/bug.h>
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extern const char linux_banner[];
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extern const char linux_proc_banner[];
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#define USHORT_MAX ((u16)(~0U))
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#define SHORT_MAX ((s16)(USHORT_MAX>>1))
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#define SHORT_MIN (-SHORT_MAX - 1)
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#define INT_MAX ((int)(~0U>>1))
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#define INT_MIN (-INT_MAX - 1)
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#define UINT_MAX (~0U)
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#define LONG_MAX ((long)(~0UL>>1))
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#define LONG_MIN (-LONG_MAX - 1)
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#define ULONG_MAX (~0UL)
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#define LLONG_MAX ((long long)(~0ULL>>1))
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#define LLONG_MIN (-LLONG_MAX - 1)
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#define ULLONG_MAX (~0ULL)
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#define STACK_MAGIC 0xdeadbeef
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#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
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#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
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#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
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#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
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#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
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#define _RET_IP_ (unsigned long)__builtin_return_address(0)
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#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
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#ifdef CONFIG_LBD
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# include <asm/div64.h>
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# define sector_div(a, b) do_div(a, b)
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#else
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# define sector_div(n, b)( \
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{ \
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int _res; \
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_res = (n) % (b); \
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(n) /= (b); \
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_res; \
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} \
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)
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#endif
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/**
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* upper_32_bits - return bits 32-63 of a number
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* @n: the number we're accessing
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*
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* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
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* the "right shift count >= width of type" warning when that quantity is
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* 32-bits.
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*/
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#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
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/**
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* lower_32_bits - return bits 0-31 of a number
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* @n: the number we're accessing
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*/
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#define lower_32_bits(n) ((u32)(n))
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#define KERN_EMERG "<0>" /* system is unusable */
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#define KERN_ALERT "<1>" /* action must be taken immediately */
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#define KERN_CRIT "<2>" /* critical conditions */
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#define KERN_ERR "<3>" /* error conditions */
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#define KERN_WARNING "<4>" /* warning conditions */
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#define KERN_NOTICE "<5>" /* normal but significant condition */
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#define KERN_INFO "<6>" /* informational */
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#define KERN_DEBUG "<7>" /* debug-level messages */
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/*
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* Annotation for a "continued" line of log printout (only done after a
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* line that had no enclosing \n). Only to be used by core/arch code
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* during early bootup (a continued line is not SMP-safe otherwise).
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*/
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#define KERN_CONT ""
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extern int console_printk[];
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#define console_loglevel (console_printk[0])
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#define default_message_loglevel (console_printk[1])
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#define minimum_console_loglevel (console_printk[2])
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#define default_console_loglevel (console_printk[3])
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struct completion;
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struct pt_regs;
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struct user;
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#ifdef CONFIG_PREEMPT_VOLUNTARY
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extern int _cond_resched(void);
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# define might_resched() _cond_resched()
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#else
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# define might_resched() do { } while (0)
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#endif
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/**
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* might_sleep - annotation for functions that can sleep
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*
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* this macro will print a stack trace if it is executed in an atomic
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* context (spinlock, irq-handler, ...).
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*
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* This is a useful debugging help to be able to catch problems early and not
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* be bitten later when the calling function happens to sleep when it is not
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* supposed to.
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*/
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#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
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void __might_sleep(char *file, int line);
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# define might_sleep() \
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do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
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#else
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# define might_sleep() do { might_resched(); } while (0)
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#endif
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#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
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#define abs(x) ({ \
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int __x = (x); \
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(__x < 0) ? -__x : __x; \
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})
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extern struct atomic_notifier_head panic_notifier_list;
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extern long (*panic_blink)(long time);
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NORET_TYPE void panic(const char * fmt, ...)
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__attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
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extern void oops_enter(void);
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extern void oops_exit(void);
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extern int oops_may_print(void);
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NORET_TYPE void do_exit(long error_code)
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ATTRIB_NORET;
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NORET_TYPE void complete_and_exit(struct completion *, long)
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ATTRIB_NORET;
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extern unsigned long simple_strtoul(const char *,char **,unsigned int);
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extern long simple_strtol(const char *,char **,unsigned int);
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extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
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extern long long simple_strtoll(const char *,char **,unsigned int);
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extern int strict_strtoul(const char *, unsigned int, unsigned long *);
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extern int strict_strtol(const char *, unsigned int, long *);
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extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
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extern int strict_strtoll(const char *, unsigned int, long long *);
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extern int sprintf(char * buf, const char * fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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extern int vsprintf(char *buf, const char *, va_list)
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__attribute__ ((format (printf, 2, 0)));
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extern int snprintf(char * buf, size_t size, const char * fmt, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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__attribute__ ((format (printf, 3, 0)));
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extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
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__attribute__ ((format (printf, 3, 0)));
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extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
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extern int sscanf(const char *, const char *, ...)
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__attribute__ ((format (scanf, 2, 3)));
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extern int vsscanf(const char *, const char *, va_list)
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__attribute__ ((format (scanf, 2, 0)));
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extern int get_option(char **str, int *pint);
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extern char *get_options(const char *str, int nints, int *ints);
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extern unsigned long long memparse(char *ptr, char **retptr);
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extern int core_kernel_text(unsigned long addr);
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extern int __kernel_text_address(unsigned long addr);
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extern int kernel_text_address(unsigned long addr);
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struct pid;
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extern struct pid *session_of_pgrp(struct pid *pgrp);
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/*
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* FW_BUG
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* Add this to a message where you are sure the firmware is buggy or behaves
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* really stupid or out of spec. Be aware that the responsible BIOS developer
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* should be able to fix this issue or at least get a concrete idea of the
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* problem by reading your message without the need of looking at the kernel
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* code.
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*
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* Use it for definite and high priority BIOS bugs.
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*
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* FW_WARN
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* Use it for not that clear (e.g. could the kernel messed up things already?)
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* and medium priority BIOS bugs.
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*
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* FW_INFO
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* Use this one if you want to tell the user or vendor about something
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* suspicious, but generally harmless related to the firmware.
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*
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* Use it for information or very low priority BIOS bugs.
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*/
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#define FW_BUG "[Firmware Bug]: "
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#define FW_WARN "[Firmware Warn]: "
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#define FW_INFO "[Firmware Info]: "
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#ifdef CONFIG_PRINTK
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asmlinkage int vprintk(const char *fmt, va_list args)
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__attribute__ ((format (printf, 1, 0)));
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asmlinkage int printk(const char * fmt, ...)
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__attribute__ ((format (printf, 1, 2))) __cold;
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extern struct ratelimit_state printk_ratelimit_state;
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extern int printk_ratelimit(void);
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extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec);
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#else
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static inline int vprintk(const char *s, va_list args)
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__attribute__ ((format (printf, 1, 0)));
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static inline int vprintk(const char *s, va_list args) { return 0; }
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static inline int printk(const char *s, ...)
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__attribute__ ((format (printf, 1, 2)));
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static inline int __cold printk(const char *s, ...) { return 0; }
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static inline int printk_ratelimit(void) { return 0; }
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static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
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unsigned int interval_msec) \
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{ return false; }
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#endif
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extern void asmlinkage __attribute__((format(printf, 1, 2)))
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early_printk(const char *fmt, ...);
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unsigned long int_sqrt(unsigned long);
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static inline void console_silent(void)
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{
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console_loglevel = 0;
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}
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static inline void console_verbose(void)
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{
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if (console_loglevel)
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console_loglevel = 15;
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}
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extern void bust_spinlocks(int yes);
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extern void wake_up_klogd(void);
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extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
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extern int panic_timeout;
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extern int panic_on_oops;
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extern int panic_on_unrecovered_nmi;
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extern int tainted;
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extern const char *print_tainted(void);
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extern void add_taint(unsigned);
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extern int root_mountflags;
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/* Values used for system_state */
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extern enum system_states {
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SYSTEM_BOOTING,
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SYSTEM_RUNNING,
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SYSTEM_HALT,
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SYSTEM_POWER_OFF,
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SYSTEM_RESTART,
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SYSTEM_SUSPEND_DISK,
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} system_state;
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#define TAINT_PROPRIETARY_MODULE (1<<0)
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#define TAINT_FORCED_MODULE (1<<1)
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#define TAINT_UNSAFE_SMP (1<<2)
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#define TAINT_FORCED_RMMOD (1<<3)
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#define TAINT_MACHINE_CHECK (1<<4)
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#define TAINT_BAD_PAGE (1<<5)
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#define TAINT_USER (1<<6)
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#define TAINT_DIE (1<<7)
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#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
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#define TAINT_WARN (1<<9)
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extern void dump_stack(void) __cold;
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enum {
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DUMP_PREFIX_NONE,
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DUMP_PREFIX_ADDRESS,
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DUMP_PREFIX_OFFSET
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};
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extern void hex_dump_to_buffer(const void *buf, size_t len,
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int rowsize, int groupsize,
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char *linebuf, size_t linebuflen, bool ascii);
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extern void print_hex_dump(const char *level, const char *prefix_str,
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int prefix_type, int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii);
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extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len);
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extern const char hex_asc[];
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#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
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#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
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static inline char *pack_hex_byte(char *buf, u8 byte)
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{
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*buf++ = hex_asc_hi(byte);
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*buf++ = hex_asc_lo(byte);
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return buf;
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}
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#define pr_emerg(fmt, arg...) \
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printk(KERN_EMERG fmt, ##arg)
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#define pr_alert(fmt, arg...) \
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printk(KERN_ALERT fmt, ##arg)
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#define pr_crit(fmt, arg...) \
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printk(KERN_CRIT fmt, ##arg)
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#define pr_err(fmt, arg...) \
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printk(KERN_ERR fmt, ##arg)
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#define pr_warning(fmt, arg...) \
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printk(KERN_WARNING fmt, ##arg)
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#define pr_notice(fmt, arg...) \
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printk(KERN_NOTICE fmt, ##arg)
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#define pr_info(fmt, arg...) \
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printk(KERN_INFO fmt, ##arg)
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#ifdef DEBUG
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/* If you are writing a driver, please use dev_dbg instead */
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#define pr_debug(fmt, arg...) \
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printk(KERN_DEBUG fmt, ##arg)
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#else
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#define pr_debug(fmt, arg...) \
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({ if (0) printk(KERN_DEBUG fmt, ##arg); 0; })
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#endif
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/*
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* Display an IP address in readable format.
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*/
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#define NIPQUAD(addr) \
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((unsigned char *)&addr)[0], \
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((unsigned char *)&addr)[1], \
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((unsigned char *)&addr)[2], \
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((unsigned char *)&addr)[3]
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#define NIPQUAD_FMT "%u.%u.%u.%u"
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#define NIP6(addr) \
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ntohs((addr).s6_addr16[0]), \
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ntohs((addr).s6_addr16[1]), \
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ntohs((addr).s6_addr16[2]), \
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ntohs((addr).s6_addr16[3]), \
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ntohs((addr).s6_addr16[4]), \
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ntohs((addr).s6_addr16[5]), \
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ntohs((addr).s6_addr16[6]), \
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ntohs((addr).s6_addr16[7])
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#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
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#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
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#if defined(__LITTLE_ENDIAN)
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#define HIPQUAD(addr) \
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((unsigned char *)&addr)[3], \
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((unsigned char *)&addr)[2], \
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((unsigned char *)&addr)[1], \
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((unsigned char *)&addr)[0]
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#elif defined(__BIG_ENDIAN)
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#define HIPQUAD NIPQUAD
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#else
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#error "Please fix asm/byteorder.h"
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#endif /* __LITTLE_ENDIAN */
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/*
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* min()/max()/clamp() macros that also do
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* strict type-checking.. See the
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* "unnecessary" pointer comparison.
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*/
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#define min(x, y) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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#define max(x, y) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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/**
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* 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; })
|
|
|
|
/**
|
|
* 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
|
|
|
|
#endif
|