![Mimi Zohar](/assets/img/avatar_default.png)
hex2bin converts a hexadecimal string to its binary representation. The original version of hex2bin did not do any error checking. This patch adds error checking and returns the result. Changelog v1: - removed unpack_hex_byte() - changed return code from boolean to int Changelog: - use the new unpack_hex_byte() - add __must_check compiler option (Andy Shevchenko's suggestion) - change function API to return error checking result (based on Tetsuo Handa's initial patch) Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
748 lines
24 KiB
C
748 lines
24 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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#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
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#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
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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/printk.h>
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#include <linux/dynamic_debug.h>
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#include <asm/byteorder.h>
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#include <asm/bug.h>
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#define USHRT_MAX ((u16)(~0U))
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#define SHRT_MAX ((s16)(USHRT_MAX>>1))
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#define SHRT_MIN ((s16)(-SHRT_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_KERNEL((x), (a))
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#define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (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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/*
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* This looks more complex than it should be. But we need to
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* get the type for the ~ right in round_down (it needs to be
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* as wide as the result!), and we want to evaluate the macro
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* arguments just once each.
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*/
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#define __round_mask(x, y) ((__typeof__(x))((y)-1))
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#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
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#define round_down(x, y) ((x) & ~__round_mask(x, y))
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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 DIV_ROUND_UP_ULL(ll,d) \
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({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
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#if BITS_PER_LONG == 32
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# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
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#else
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# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
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#endif
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/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
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#define roundup(x, y) ( \
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{ \
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const typeof(y) __y = y; \
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(((x) + (__y - 1)) / __y) * __y; \
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} \
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)
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#define rounddown(x, y) ( \
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{ \
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typeof(x) __x = (x); \
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__x - (__x % (y)); \
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} \
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)
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#define DIV_ROUND_CLOSEST(x, divisor)( \
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{ \
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typeof(divisor) __divisor = divisor; \
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(((x) + ((__divisor) / 2)) / (__divisor)); \
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} \
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)
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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_LBDAF
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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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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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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
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void __might_sleep(const char *file, int line, int preempt_offset);
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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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# define might_sleep() \
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do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
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#else
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static inline void __might_sleep(const char *file, int line,
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int preempt_offset) { }
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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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/*
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* abs() handles unsigned and signed longs, ints, shorts and chars. For all
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* input types abs() returns a signed long.
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* abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
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* for those.
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*/
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#define abs(x) ({ \
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long ret; \
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if (sizeof(x) == sizeof(long)) { \
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long __x = (x); \
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ret = (__x < 0) ? -__x : __x; \
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} else { \
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int __x = (x); \
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ret = (__x < 0) ? -__x : __x; \
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} \
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ret; \
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})
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#define abs64(x) ({ \
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s64 __x = (x); \
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(__x < 0) ? -__x : __x; \
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})
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#ifdef CONFIG_PROVE_LOCKING
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void might_fault(void);
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#else
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static inline void might_fault(void)
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{
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might_sleep();
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}
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#endif
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extern struct atomic_notifier_head panic_notifier_list;
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extern long (*panic_blink)(int state);
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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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void print_oops_end_marker(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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/* Internal, do not use. */
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int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
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int __must_check _kstrtol(const char *s, unsigned int base, long *res);
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int __must_check kstrtoull(const char *s, unsigned int base, unsigned long long *res);
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int __must_check kstrtoll(const char *s, unsigned int base, long long *res);
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static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
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{
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/*
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* We want to shortcut function call, but
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* __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
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*/
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if (sizeof(unsigned long) == sizeof(unsigned long long) &&
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__alignof__(unsigned long) == __alignof__(unsigned long long))
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return kstrtoull(s, base, (unsigned long long *)res);
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else
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return _kstrtoul(s, base, res);
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}
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static inline int __must_check kstrtol(const char *s, unsigned int base, long *res)
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{
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/*
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* We want to shortcut function call, but
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* __builtin_types_compatible_p(long, long long) = 0.
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*/
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if (sizeof(long) == sizeof(long long) &&
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__alignof__(long) == __alignof__(long long))
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return kstrtoll(s, base, (long long *)res);
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else
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return _kstrtol(s, base, res);
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}
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int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res);
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int __must_check kstrtoint(const char *s, unsigned int base, int *res);
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static inline int __must_check kstrtou64(const char *s, unsigned int base, u64 *res)
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{
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return kstrtoull(s, base, res);
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}
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static inline int __must_check kstrtos64(const char *s, unsigned int base, s64 *res)
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{
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return kstrtoll(s, base, res);
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}
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static inline int __must_check kstrtou32(const char *s, unsigned int base, u32 *res)
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{
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return kstrtouint(s, base, res);
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}
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static inline int __must_check kstrtos32(const char *s, unsigned int base, s32 *res)
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{
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return kstrtoint(s, base, res);
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}
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int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
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int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
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int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
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int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
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int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
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int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
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int __must_check kstrtoul_from_user(const char __user *s, size_t count, unsigned int base, unsigned long *res);
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int __must_check kstrtol_from_user(const char __user *s, size_t count, unsigned int base, long *res);
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int __must_check kstrtouint_from_user(const char __user *s, size_t count, unsigned int base, unsigned int *res);
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int __must_check kstrtoint_from_user(const char __user *s, size_t count, unsigned int base, int *res);
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int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigned int base, u16 *res);
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int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
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int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
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int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
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static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
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{
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return kstrtoull_from_user(s, count, base, res);
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}
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static inline int __must_check kstrtos64_from_user(const char __user *s, size_t count, unsigned int base, s64 *res)
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{
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return kstrtoll_from_user(s, count, base, res);
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}
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static inline int __must_check kstrtou32_from_user(const char __user *s, size_t count, unsigned int base, u32 *res)
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{
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return kstrtouint_from_user(s, count, base, res);
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}
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static inline int __must_check kstrtos32_from_user(const char __user *s, size_t count, unsigned int base, s32 *res)
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{
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return kstrtoint_from_user(s, count, base, res);
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}
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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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#define strict_strtoul kstrtoul
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#define strict_strtol kstrtol
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#define strict_strtoull kstrtoull
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#define strict_strtoll kstrtoll
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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(const char *ptr, char **retptr);
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extern int core_kernel_text(unsigned long addr);
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extern int core_kernel_data(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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extern int func_ptr_is_kernel_text(void *ptr);
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struct pid;
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extern struct pid *session_of_pgrp(struct pid *pgrp);
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unsigned long int_sqrt(unsigned long);
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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 panic_on_io_nmi;
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extern const char *print_tainted(void);
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extern void add_taint(unsigned flag);
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extern int test_taint(unsigned flag);
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extern unsigned long get_taint(void);
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extern int root_mountflags;
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extern bool early_boot_irqs_disabled;
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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 0
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#define TAINT_FORCED_MODULE 1
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#define TAINT_UNSAFE_SMP 2
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#define TAINT_FORCED_RMMOD 3
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#define TAINT_MACHINE_CHECK 4
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#define TAINT_BAD_PAGE 5
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#define TAINT_USER 6
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#define TAINT_DIE 7
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#define TAINT_OVERRIDDEN_ACPI_TABLE 8
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#define TAINT_WARN 9
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#define TAINT_CRAP 10
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#define TAINT_FIRMWARE_WORKAROUND 11
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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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extern int hex_to_bin(char ch);
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extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
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/*
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* General tracing related utility functions - trace_printk(),
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* tracing_on/tracing_off and tracing_start()/tracing_stop
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*
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* Use tracing_on/tracing_off when you want to quickly turn on or off
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* tracing. It simply enables or disables the recording of the trace events.
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* This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
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* file, which gives a means for the kernel and userspace to interact.
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* Place a tracing_off() in the kernel where you want tracing to end.
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* From user space, examine the trace, and then echo 1 > tracing_on
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* to continue tracing.
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*
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* tracing_stop/tracing_start has slightly more overhead. It is used
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* by things like suspend to ram where disabling the recording of the
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* trace is not enough, but tracing must actually stop because things
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* like calling smp_processor_id() may crash the system.
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*
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* Most likely, you want to use tracing_on/tracing_off.
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*/
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#ifdef CONFIG_RING_BUFFER
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void tracing_on(void);
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void tracing_off(void);
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/* trace_off_permanent stops recording with no way to bring it back */
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void tracing_off_permanent(void);
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int tracing_is_on(void);
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#else
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static inline void tracing_on(void) { }
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static inline void tracing_off(void) { }
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static inline void tracing_off_permanent(void) { }
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static inline int tracing_is_on(void) { return 0; }
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#endif
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enum ftrace_dump_mode {
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DUMP_NONE,
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DUMP_ALL,
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DUMP_ORIG,
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};
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#ifdef CONFIG_TRACING
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extern void tracing_start(void);
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extern void tracing_stop(void);
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extern void ftrace_off_permanent(void);
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static inline void __attribute__ ((format (printf, 1, 2)))
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____trace_printk_check_format(const char *fmt, ...)
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{
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}
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#define __trace_printk_check_format(fmt, args...) \
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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) );})
|
|
|
|
#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
|
|
|
|
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.. */
|
|
};
|
|
|
|
#endif
|