Fix signal handler installation

[urcu.git] / api_x86.h

/* MECHANICALLY GENERATED, DO NOT EDIT!!! */

#define _INCLUDE_API_H

/*
 * common.h: Common Linux kernel-isms.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; but version 2 of the License only due
 * to code included from the Linux kernel.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (c) 2006 Paul E. McKenney, IBM.
 *
 * Much code taken from the Linux kernel.  For such code, the option
 * to redistribute under later versions of GPL might not be available.
 */

#ifndef __always_inline
#define __always_inline inline
#endif

#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)

#ifdef __ASSEMBLY__
#  define stringify_in_c(...)   __VA_ARGS__
#  define ASM_CONST(x)          x
#else
/* This version of stringify will deal with commas... */
#  define __stringify_in_c(...) #__VA_ARGS__
#  define stringify_in_c(...)   __stringify_in_c(__VA_ARGS__) " "
#  define __ASM_CONST(x)        x##UL
#  define ASM_CONST(x)          __ASM_CONST(x)
#endif


/*
 * arch-i386.h: Expose x86 atomic instructions.  80486 and better only.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, but version 2 only due to inclusion
 * of Linux-kernel code.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (c) 2006 Paul E. McKenney, IBM.
 *
 * Much code taken from the Linux kernel.  For such code, the option
 * to redistribute under later versions of GPL might not be available.
 */

/*
 * Machine parameters.
 */

#define CONFIG_SMP

#define CACHE_LINE_SIZE 64
#define ____cacheline_internodealigned_in_smp \
        __attribute__((__aligned__(1 << 6)))

#define LOCK_PREFIX "lock ; "

/*
 * Atomic data structure, initialization, and access.
 */

typedef struct { volatile int counter; } atomic_t;

#define ATOMIC_INIT(i)  { (i) }

#define atomic_read(v)          ((v)->counter)
#define atomic_set(v, i)        (((v)->counter) = (i))

/*
 * Atomic operations.
 */

/**
 * atomic_add - add integer to atomic variable
 * @i: integer value to add
 * @v: pointer of type atomic_t
 * 
 * Atomically adds @i to @v.
 */
static __inline__ void atomic_add(int i, atomic_t *v)
{
        __asm__ __volatile__(
                LOCK_PREFIX "addl %1,%0"
                :"+m" (v->counter)
                :"ir" (i));
}

/**
 * atomic_sub - subtract the atomic variable
 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 * 
 * Atomically subtracts @i from @v.
 */
static __inline__ void atomic_sub(int i, atomic_t *v)
{
        __asm__ __volatile__(
                LOCK_PREFIX "subl %1,%0"
                :"+m" (v->counter)
                :"ir" (i));
}

/**
 * atomic_sub_and_test - subtract value from variable and test result
 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 * 
 * Atomically subtracts @i from @v and returns
 * true if the result is zero, or false for all
 * other cases.
 */
static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
{
        unsigned char c;

        __asm__ __volatile__(
                LOCK_PREFIX "subl %2,%0; sete %1"
                :"+m" (v->counter), "=qm" (c)
                :"ir" (i) : "memory");
        return c;
}

/**
 * atomic_inc - increment atomic variable
 * @v: pointer of type atomic_t
 * 
 * Atomically increments @v by 1.
 */ 
static __inline__ void atomic_inc(atomic_t *v)
{
        __asm__ __volatile__(
                LOCK_PREFIX "incl %0"
                :"+m" (v->counter));
}

/**
 * atomic_dec - decrement atomic variable
 * @v: pointer of type atomic_t
 * 
 * Atomically decrements @v by 1.
 */ 
static __inline__ void atomic_dec(atomic_t *v)
{
        __asm__ __volatile__(
                LOCK_PREFIX "decl %0"
                :"+m" (v->counter));
}

/**
 * atomic_dec_and_test - decrement and test
 * @v: pointer of type atomic_t
 * 
 * Atomically decrements @v by 1 and
 * returns true if the result is 0, or false for all other
 * cases.
 */ 
static __inline__ int atomic_dec_and_test(atomic_t *v)
{
        unsigned char c;

        __asm__ __volatile__(
                LOCK_PREFIX "decl %0; sete %1"
                :"+m" (v->counter), "=qm" (c)
                : : "memory");
        return c != 0;
}

/**
 * atomic_inc_and_test - increment and test 
 * @v: pointer of type atomic_t
 * 
 * Atomically increments @v by 1
 * and returns true if the result is zero, or false for all
 * other cases.
 */ 
static __inline__ int atomic_inc_and_test(atomic_t *v)
{
        unsigned char c;

        __asm__ __volatile__(
                LOCK_PREFIX "incl %0; sete %1"
                :"+m" (v->counter), "=qm" (c)
                : : "memory");
        return c != 0;
}

/**
 * atomic_add_negative - add and test if negative
 * @v: pointer of type atomic_t
 * @i: integer value to add
 * 
 * Atomically adds @i to @v and returns true
 * if the result is negative, or false when
 * result is greater than or equal to zero.
 */ 
static __inline__ int atomic_add_negative(int i, atomic_t *v)
{
        unsigned char c;

        __asm__ __volatile__(
                LOCK_PREFIX "addl %2,%0; sets %1"
                :"+m" (v->counter), "=qm" (c)
                :"ir" (i) : "memory");
        return c;
}

/**
 * atomic_add_return - add and return
 * @v: pointer of type atomic_t
 * @i: integer value to add
 *
 * Atomically adds @i to @v and returns @i + @v
 */
static __inline__ int atomic_add_return(int i, atomic_t *v)
{
        int __i;

        __i = i;
        __asm__ __volatile__(
                LOCK_PREFIX "xaddl %0, %1;"
                :"=r"(i)
                :"m"(v->counter), "0"(i));
        return i + __i;
}

static __inline__ int atomic_sub_return(int i, atomic_t *v)
{
        return atomic_add_return(-i,v);
}

static inline unsigned int
cmpxchg(volatile long *ptr, long oldval, long newval)
{
        unsigned long retval;

        asm("# cmpxchg\n"
            "lock; cmpxchgl %4,(%2)\n"
            "# end atomic_cmpxchg4"
            : "=a" (retval), "=m" (*ptr)
            : "r" (ptr), "0" (oldval), "r" (newval), "m" (*ptr)
            : "cc");
        return (retval);
}

#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * atomic_add_unless - add unless the number is a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns non-zero if @v was not @u, and zero otherwise.
 */
#define atomic_add_unless(v, a, u)                              \
({                                                              \
        int c, old;                                             \
        c = atomic_read(v);                                     \
        for (;;) {                                              \
                if (unlikely(c == (u)))                         \
                        break;                                  \
                old = atomic_cmpxchg((v), c, c + (a));          \
                if (likely(old == c))                           \
                        break;                                  \
                c = old;                                        \
        }                                                       \
        c != (u);                                               \
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

#define atomic_inc_return(v)  (atomic_add_return(1,v))
#define atomic_dec_return(v)  (atomic_sub_return(1,v))

/* These are x86-specific, used by some header files */
#define atomic_clear_mask(mask, addr) \
__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
: : "r" (~(mask)),"m" (*addr) : "memory")

#define atomic_set_mask(mask, addr) \
__asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
: : "r" (mask),"m" (*(addr)) : "memory")

/* Atomic operations are already serializing on x86 */
#define smp_mb__before_atomic_dec()     barrier()
#define smp_mb__after_atomic_dec()      barrier()
#define smp_mb__before_atomic_inc()     barrier()
#define smp_mb__after_atomic_inc()      barrier()

#define smp_mb() \
__asm__ __volatile__("mfence" : : : "memory")
/* __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory") */


/*
 * Generate 64-bit timestamp.
 */

static unsigned long long get_timestamp(void)
{
        unsigned int __a,__d;

        __asm__ __volatile__("rdtsc" : "=a" (__a), "=d" (__d));
        return ((long long)__a) | (((long long)__d)<<32);
}

/*
 * api_pthreads.h: API mapping to pthreads environment.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.  However, please note that much
 * of the code in this file derives from the Linux kernel, and that such
 * code may not be available except under GPLv2.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (c) 2006 Paul E. McKenney, IBM.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#define __USE_GNU
#include <pthread.h>
#include <sched.h>
#include <sys/param.h>
/* #include "atomic.h" */

/*
 * Compiler magic.
 */
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})
#define barrier() __asm__ __volatile__("": : :"memory")

/*
 * Default machine parameters.
 */

#ifndef CACHE_LINE_SIZE
#define CACHE_LINE_SIZE 128
#endif /* #ifndef CACHE_LINE_SIZE */

/*
 * Exclusive locking primitives.
 */

typedef pthread_mutex_t spinlock_t;

#define DEFINE_SPINLOCK(lock) spinlock_t lock = PTHREAD_MUTEX_INITIALIZER;
#define __SPIN_LOCK_UNLOCKED(lockp) PTHREAD_MUTEX_INITIALIZER

static void spin_lock_init(spinlock_t *sp)
{
        if (pthread_mutex_init(sp, NULL) != 0) {
                perror("spin_lock_init:pthread_mutex_init");
                exit(-1);
        }
}

static void spin_lock(spinlock_t *sp)
{
        if (pthread_mutex_lock(sp) != 0) {
                perror("spin_lock:pthread_mutex_lock");
                exit(-1);
        }
}

static int spin_trylock(spinlock_t *sp)
{
        int retval;

        if ((retval = pthread_mutex_trylock(sp)) == 0)
                return 1;
        if (retval == EBUSY)
                return 0;
        perror("spin_trylock:pthread_mutex_trylock");
        exit(-1);
}

static void spin_unlock(spinlock_t *sp)
{
        if (pthread_mutex_unlock(sp) != 0) {
                perror("spin_unlock:pthread_mutex_unlock");
                exit(-1);
        }
}

#define spin_lock_irqsave(l, f) do { f = 1; spin_lock(l); } while (0)
#define spin_unlock_irqrestore(l, f) do { f = 0; spin_unlock(l); } while (0)

#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
#define unlikely(x) x
#define likely(x) x
#define prefetch(x) x

/*
 * Thread creation/destruction primitives.
 */

typedef pthread_t thread_id_t;

#define NR_THREADS 128

#define __THREAD_ID_MAP_EMPTY 0
#define __THREAD_ID_MAP_WAITING 1
thread_id_t __thread_id_map[NR_THREADS];
spinlock_t __thread_id_map_mutex;

#define for_each_thread(t) \
        for (t = 0; t < NR_THREADS; t++)

#define for_each_running_thread(t) \
        for (t = 0; t < NR_THREADS; t++) \
                if ((__thread_id_map[t] != __THREAD_ID_MAP_EMPTY) && \
                    (__thread_id_map[t] != __THREAD_ID_MAP_WAITING))

pthread_key_t thread_id_key;

static int __smp_thread_id(void)
{
        int i;
        thread_id_t tid = pthread_self();

        for (i = 0; i < NR_THREADS; i++) {
                if (__thread_id_map[i] == tid) {
                        long v = i + 1;  /* must be non-NULL. */

                        if (pthread_setspecific(thread_id_key, (void *)v) != 0) {
                                perror("pthread_setspecific");
                                exit(-1);
                        }
                        return i;
                }
        }
        spin_lock(&__thread_id_map_mutex);
        for (i = 0; i < NR_THREADS; i++) {
                if (__thread_id_map[i] == tid)
                        spin_unlock(&__thread_id_map_mutex);
                        return i;
        }
        spin_unlock(&__thread_id_map_mutex);
        fprintf(stderr, "smp_thread_id: Rogue thread, id: %d(%#x)\n", tid, tid);
        exit(-1);
}

static int smp_thread_id(void)
{
        void *id;

        id = pthread_getspecific(thread_id_key);
        if (id == NULL)
                return __smp_thread_id();
        return (long)(id - 1);
}

static thread_id_t create_thread(void *(*func)(void *), void *arg)
{
        thread_id_t tid;
        int i;

        spin_lock(&__thread_id_map_mutex);
        for (i = 0; i < NR_THREADS; i++) {
                if (__thread_id_map[i] == __THREAD_ID_MAP_EMPTY)
                        break;
        }
        if (i >= NR_THREADS) {
                spin_unlock(&__thread_id_map_mutex);
                fprintf(stderr, "Thread limit of %d exceeded!\n", NR_THREADS);
                exit(-1);
        }
        __thread_id_map[i] = __THREAD_ID_MAP_WAITING;
        spin_unlock(&__thread_id_map_mutex);
        if (pthread_create(&tid, NULL, func, arg) != 0) {
                perror("create_thread:pthread_create");
                exit(-1);
        }
        __thread_id_map[i] = tid;
        return tid;
}

static void *wait_thread(thread_id_t tid)
{
        int i;
        void *vp;

        for (i = 0; i < NR_THREADS; i++) {
                if (__thread_id_map[i] == tid)
                        break;
        }
        if (i >= NR_THREADS){
                fprintf(stderr, "wait_thread: bad tid = %d(%#x)\n", tid, tid);
                exit(-1);
        }
        if (pthread_join(tid, &vp) != 0) {
                perror("wait_thread:pthread_join");
                exit(-1);
        }
        __thread_id_map[i] = __THREAD_ID_MAP_EMPTY;
        return vp;
}

static void wait_all_threads(void)
{
        int i;
        thread_id_t tid;

        for (i = 1; i < NR_THREADS; i++) {
                tid = __thread_id_map[i];
                if (tid != __THREAD_ID_MAP_EMPTY &&
                    tid != __THREAD_ID_MAP_WAITING)
                        (void)wait_thread(tid);
        }
}

static void run_on(int cpu)
{
        cpu_set_t mask;

        CPU_ZERO(&mask);
        CPU_SET(cpu, &mask);
        sched_setaffinity(0, sizeof(mask), &mask);
}

/*
 * timekeeping -- very crude -- should use MONOTONIC...
 */

long long get_microseconds(void)
{
        struct timeval tv;

        if (gettimeofday(&tv, NULL) != 0)
                abort();
        return ((long long)tv.tv_sec) * 1000000LL + (long long)tv.tv_usec;
}

/*
 * Per-thread variables.
 */

#define DEFINE_PER_THREAD(type, name) \
        struct { \
                __typeof__(type) v \
                        __attribute__((__aligned__(CACHE_LINE_SIZE))); \
        } __per_thread_##name[NR_THREADS];
#define DECLARE_PER_THREAD(type, name) extern DEFINE_PER_THREAD(type, name)

#define per_thread(name, thread) __per_thread_##name[thread].v
#define __get_thread_var(name) per_thread(name, smp_thread_id())

#define init_per_thread(name, v) \
        do { \
                int __i_p_t_i; \
                for (__i_p_t_i = 0; __i_p_t_i < NR_THREADS; __i_p_t_i++) \
                        per_thread(name, __i_p_t_i) = v; \
        } while (0)

/*
 * CPU traversal primitives.
 */

#ifndef NR_CPUS
#define NR_CPUS 16
#endif /* #ifndef NR_CPUS */

#define for_each_possible_cpu(cpu) \
        for (cpu = 0; cpu < NR_CPUS; cpu++)
#define for_each_online_cpu(cpu) \
        for (cpu = 0; cpu < NR_CPUS; cpu++)

/*
 * Per-CPU variables.
 */

#define DEFINE_PER_CPU(type, name) \
        struct { \
                __typeof__(type) v \
                        __attribute__((__aligned__(CACHE_LINE_SIZE))); \
        } __per_cpu_##name[NR_CPUS]
#define DECLARE_PER_CPU(type, name) extern DEFINE_PER_CPU(type, name)

DEFINE_PER_THREAD(int, smp_processor_id);

static int smp_processor_id(void)
{
        return __get_thread_var(smp_processor_id);
}

static void set_smp_processor_id(int cpu)
{
        __get_thread_var(smp_processor_id) = cpu;
}

#define per_cpu(name, thread) __per_cpu_##name[thread].v
#define __get_cpu_var(name) per_cpu(name, smp_processor_id())

#define init_per_cpu(name, v) \
        do { \
                int __i_p_c_i; \
                for (__i_p_c_i = 0; __i_p_c_i < NR_CPUS; __i_p_c_i++) \
                        per_cpu(name, __i_p_c_i) = v; \
        } while (0)

/*
 * CPU state checking (crowbarred).
 */

#define idle_cpu(cpu) 0
#define in_softirq() 1
#define hardirq_count() 0
#define PREEMPT_SHIFT   0
#define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
#define PREEMPT_BITS    8
#define SOFTIRQ_BITS    8

/*
 * CPU hotplug.
 */

struct notifier_block {
        int (*notifier_call)(struct notifier_block *, unsigned long, void *);
        struct notifier_block *next;
        int priority;
};

#define CPU_ONLINE              0x0002 /* CPU (unsigned)v is up */
#define CPU_UP_PREPARE          0x0003 /* CPU (unsigned)v coming up */
#define CPU_UP_CANCELED         0x0004 /* CPU (unsigned)v NOT coming up */
#define CPU_DOWN_PREPARE        0x0005 /* CPU (unsigned)v going down */
#define CPU_DOWN_FAILED         0x0006 /* CPU (unsigned)v NOT going down */
#define CPU_DEAD                0x0007 /* CPU (unsigned)v dead */
#define CPU_DYING               0x0008 /* CPU (unsigned)v not running any task,
                                        * not handling interrupts, soon dead */
#define CPU_POST_DEAD           0x0009 /* CPU (unsigned)v dead, cpu_hotplug
                                        * lock is dropped */

/* Used for CPU hotplug events occuring while tasks are frozen due to a suspend
 * operation in progress
 */
#define CPU_TASKS_FROZEN        0x0010

#define CPU_ONLINE_FROZEN       (CPU_ONLINE | CPU_TASKS_FROZEN)
#define CPU_UP_PREPARE_FROZEN   (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
#define CPU_UP_CANCELED_FROZEN  (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
#define CPU_DOWN_FAILED_FROZEN  (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
#define CPU_DEAD_FROZEN         (CPU_DEAD | CPU_TASKS_FROZEN)
#define CPU_DYING_FROZEN        (CPU_DYING | CPU_TASKS_FROZEN)

/* Hibernation and suspend events */
#define PM_HIBERNATION_PREPARE  0x0001 /* Going to hibernate */
#define PM_POST_HIBERNATION     0x0002 /* Hibernation finished */
#define PM_SUSPEND_PREPARE      0x0003 /* Going to suspend the system */
#define PM_POST_SUSPEND         0x0004 /* Suspend finished */
#define PM_RESTORE_PREPARE      0x0005 /* Going to restore a saved image */
#define PM_POST_RESTORE         0x0006 /* Restore failed */

#define NOTIFY_DONE             0x0000          /* Don't care */
#define NOTIFY_OK               0x0001          /* Suits me */
#define NOTIFY_STOP_MASK        0x8000          /* Don't call further */
#define NOTIFY_BAD              (NOTIFY_STOP_MASK|0x0002)
                                                /* Bad/Veto action */
/*
 * Clean way to return from the notifier and stop further calls.
 */
#define NOTIFY_STOP             (NOTIFY_OK|NOTIFY_STOP_MASK)

/*
 * Bug checks.
 */

#define BUG_ON(c) do { if (!(c)) abort(); } while (0)

/*
 * Initialization -- Must be called before calling any primitives.
 */

static void smp_init(void)
{
        int i;

        spin_lock_init(&__thread_id_map_mutex);
        __thread_id_map[0] = pthread_self();
        for (i = 1; i < NR_THREADS; i++)
                __thread_id_map[i] = __THREAD_ID_MAP_EMPTY;
        init_per_thread(smp_processor_id, 0);
        if (pthread_key_create(&thread_id_key, NULL) != 0) {
                perror("pthread_key_create");
                exit(-1);
        }
}

/* Taken from the Linux kernel source tree, so GPLv2-only!!! */

#ifndef _LINUX_LIST_H
#define _LINUX_LIST_H

#define LIST_POISON1  ((void *) 0x00100100)
#define LIST_POISON2  ((void *) 0x00200200)

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})

/*
 * Simple doubly linked list implementation.
 *
 * Some of the internal functions ("__xxx") are useful when
 * manipulating whole lists rather than single entries, as
 * sometimes we already know the next/prev entries and we can
 * generate better code by using them directly rather than
 * using the generic single-entry routines.
 */

struct list_head {
        struct list_head *next, *prev;
};

#define LIST_HEAD_INIT(name) { &(name), &(name) }

#define LIST_HEAD(name) \
        struct list_head name = LIST_HEAD_INIT(name)

static inline void INIT_LIST_HEAD(struct list_head *list)
{
        list->next = list;
        list->prev = list;
}

/*
 * Insert a new entry between two known consecutive entries.
 *
 * This is only for internal list manipulation where we know
 * the prev/next entries already!
 */
#ifndef CONFIG_DEBUG_LIST
static inline void __list_add(struct list_head *new,
                              struct list_head *prev,
                              struct list_head *next)
{
        next->prev = new;
        new->next = next;
        new->prev = prev;
        prev->next = new;
}
#else
extern void __list_add(struct list_head *new,
                              struct list_head *prev,
                              struct list_head *next);
#endif

/**
 * list_add - add a new entry
 * @new: new entry to be added
 * @head: list head to add it after
 *
 * Insert a new entry after the specified head.
 * This is good for implementing stacks.
 */
static inline void list_add(struct list_head *new, struct list_head *head)
{
        __list_add(new, head, head->next);
}


/**
 * list_add_tail - add a new entry
 * @new: new entry to be added
 * @head: list head to add it before
 *
 * Insert a new entry before the specified head.
 * This is useful for implementing queues.
 */
static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
        __list_add(new, head->prev, head);
}

/*
 * Delete a list entry by making the prev/next entries
 * point to each other.
 *
 * This is only for internal list manipulation where we know
 * the prev/next entries already!
 */
static inline void __list_del(struct list_head * prev, struct list_head * next)
{
        next->prev = prev;
        prev->next = next;
}

/**
 * list_del - deletes entry from list.
 * @entry: the element to delete from the list.
 * Note: list_empty() on entry does not return true after this, the entry is
 * in an undefined state.
 */
#ifndef CONFIG_DEBUG_LIST
static inline void list_del(struct list_head *entry)
{
        __list_del(entry->prev, entry->next);
        entry->next = LIST_POISON1;
        entry->prev = LIST_POISON2;
}
#else
extern void list_del(struct list_head *entry);
#endif

/**
 * list_replace - replace old entry by new one
 * @old : the element to be replaced
 * @new : the new element to insert
 *
 * If @old was empty, it will be overwritten.
 */
static inline void list_replace(struct list_head *old,
                                struct list_head *new)
{
        new->next = old->next;
        new->next->prev = new;
        new->prev = old->prev;
        new->prev->next = new;
}

static inline void list_replace_init(struct list_head *old,
                                        struct list_head *new)
{
        list_replace(old, new);
        INIT_LIST_HEAD(old);
}

/**
 * list_del_init - deletes entry from list and reinitialize it.
 * @entry: the element to delete from the list.
 */
static inline void list_del_init(struct list_head *entry)
{
        __list_del(entry->prev, entry->next);
        INIT_LIST_HEAD(entry);
}

/**
 * list_move - delete from one list and add as another's head
 * @list: the entry to move
 * @head: the head that will precede our entry
 */
static inline void list_move(struct list_head *list, struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add(list, head);
}

/**
 * list_move_tail - delete from one list and add as another's tail
 * @list: the entry to move
 * @head: the head that will follow our entry
 */
static inline void list_move_tail(struct list_head *list,
                                  struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add_tail(list, head);
}

/**
 * list_is_last - tests whether @list is the last entry in list @head
 * @list: the entry to test
 * @head: the head of the list
 */
static inline int list_is_last(const struct list_head *list,
                                const struct list_head *head)
{
        return list->next == head;
}

/**
 * list_empty - tests whether a list is empty
 * @head: the list to test.
 */
static inline int list_empty(const struct list_head *head)
{
        return head->next == head;
}

/**
 * list_empty_careful - tests whether a list is empty and not being modified
 * @head: the list to test
 *
 * Description:
 * tests whether a list is empty _and_ checks that no other CPU might be
 * in the process of modifying either member (next or prev)
 *
 * NOTE: using list_empty_careful() without synchronization
 * can only be safe if the only activity that can happen
 * to the list entry is list_del_init(). Eg. it cannot be used
 * if another CPU could re-list_add() it.
 */
static inline int list_empty_careful(const struct list_head *head)
{
        struct list_head *next = head->next;
        return (next == head) && (next == head->prev);
}

/**
 * list_is_singular - tests whether a list has just one entry.
 * @head: the list to test.
 */
static inline int list_is_singular(const struct list_head *head)
{
        return !list_empty(head) && (head->next == head->prev);
}

static inline void __list_cut_position(struct list_head *list,
                struct list_head *head, struct list_head *entry)
{
        struct list_head *new_first = entry->next;
        list->next = head->next;
        list->next->prev = list;
        list->prev = entry;
        entry->next = list;
        head->next = new_first;
        new_first->prev = head;
}

/**
 * list_cut_position - cut a list into two
 * @list: a new list to add all removed entries
 * @head: a list with entries
 * @entry: an entry within head, could be the head itself
 *      and if so we won't cut the list
 *
 * This helper moves the initial part of @head, up to and
 * including @entry, from @head to @list. You should
 * pass on @entry an element you know is on @head. @list
 * should be an empty list or a list you do not care about
 * losing its data.
 *
 */
static inline void list_cut_position(struct list_head *list,
                struct list_head *head, struct list_head *entry)
{
        if (list_empty(head))
                return;
        if (list_is_singular(head) &&
                (head->next != entry && head != entry))
                return;
        if (entry == head)
                INIT_LIST_HEAD(list);
        else
                __list_cut_position(list, head, entry);
}

static inline void __list_splice(const struct list_head *list,
                                 struct list_head *prev,
                                 struct list_head *next)
{
        struct list_head *first = list->next;
        struct list_head *last = list->prev;

        first->prev = prev;
        prev->next = first;

        last->next = next;
        next->prev = last;
}

/**
 * list_splice - join two lists, this is designed for stacks
 * @list: the new list to add.
 * @head: the place to add it in the first list.
 */
static inline void list_splice(const struct list_head *list,
                                struct list_head *head)
{
        if (!list_empty(list))
                __list_splice(list, head, head->next);
}

/**
 * list_splice_tail - join two lists, each list being a queue
 * @list: the new list to add.
 * @head: the place to add it in the first list.
 */
static inline void list_splice_tail(struct list_head *list,
                                struct list_head *head)
{
        if (!list_empty(list))
                __list_splice(list, head->prev, head);
}

/**
 * list_splice_init - join two lists and reinitialise the emptied list.
 * @list: the new list to add.
 * @head: the place to add it in the first list.
 *
 * The list at @list is reinitialised
 */
static inline void list_splice_init(struct list_head *list,
                                    struct list_head *head)
{
        if (!list_empty(list)) {
                __list_splice(list, head, head->next);
                INIT_LIST_HEAD(list);
        }
}

/**
 * list_splice_tail_init - join two lists and reinitialise the emptied list
 * @list: the new list to add.
 * @head: the place to add it in the first list.
 *
 * Each of the lists is a queue.
 * The list at @list is reinitialised
 */
static inline void list_splice_tail_init(struct list_head *list,
                                         struct list_head *head)
{
        if (!list_empty(list)) {
                __list_splice(list, head->prev, head);
                INIT_LIST_HEAD(list);
        }
}

/**
 * list_entry - get the struct for this entry
 * @ptr:        the &struct list_head pointer.
 * @type:       the type of the struct this is embedded in.
 * @member:     the name of the list_struct within the struct.
 */
#define list_entry(ptr, type, member) \
        container_of(ptr, type, member)

/**
 * list_first_entry - get the first element from a list
 * @ptr:        the list head to take the element from.
 * @type:       the type of the struct this is embedded in.
 * @member:     the name of the list_struct within the struct.
 *
 * Note, that list is expected to be not empty.
 */
#define list_first_entry(ptr, type, member) \
        list_entry((ptr)->next, type, member)

/**
 * list_for_each        -       iterate over a list
 * @pos:        the &struct list_head to use as a loop cursor.
 * @head:       the head for your list.
 */
#define list_for_each(pos, head) \
        for (pos = (head)->next; prefetch(pos->next), pos != (head); \
                pos = pos->next)

/**
 * __list_for_each      -       iterate over a list
 * @pos:        the &struct list_head to use as a loop cursor.
 * @head:       the head for your list.
 *
 * This variant differs from list_for_each() in that it's the
 * simplest possible list iteration code, no prefetching is done.
 * Use this for code that knows the list to be very short (empty
 * or 1 entry) most of the time.
 */
#define __list_for_each(pos, head) \
        for (pos = (head)->next; pos != (head); pos = pos->next)

/**
 * list_for_each_prev   -       iterate over a list backwards
 * @pos:        the &struct list_head to use as a loop cursor.
 * @head:       the head for your list.
 */
#define list_for_each_prev(pos, head) \
        for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \
                pos = pos->prev)

/**
 * list_for_each_safe - iterate over a list safe against removal of list entry
 * @pos:        the &struct list_head to use as a loop cursor.
 * @n:          another &struct list_head to use as temporary storage
 * @head:       the head for your list.
 */
#define list_for_each_safe(pos, n, head) \
        for (pos = (head)->next, n = pos->next; pos != (head); \
                pos = n, n = pos->next)

/**
 * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
 * @pos:        the &struct list_head to use as a loop cursor.
 * @n:          another &struct list_head to use as temporary storage
 * @head:       the head for your list.
 */
#define list_for_each_prev_safe(pos, n, head) \
        for (pos = (head)->prev, n = pos->prev; \
             prefetch(pos->prev), pos != (head); \
             pos = n, n = pos->prev)

/**
 * list_for_each_entry  -       iterate over list of given type
 * @pos:        the type * to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 */
#define list_for_each_entry(pos, head, member)                          \
        for (pos = list_entry((head)->next, typeof(*pos), member);      \
             prefetch(pos->member.next), &pos->member != (head);        \
             pos = list_entry(pos->member.next, typeof(*pos), member))

/**
 * list_for_each_entry_reverse - iterate backwards over list of given type.
 * @pos:        the type * to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 */
#define list_for_each_entry_reverse(pos, head, member)                  \
        for (pos = list_entry((head)->prev, typeof(*pos), member);      \
             prefetch(pos->member.prev), &pos->member != (head);        \
             pos = list_entry(pos->member.prev, typeof(*pos), member))

/**
 * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
 * @pos:        the type * to use as a start point
 * @head:       the head of the list
 * @member:     the name of the list_struct within the struct.
 *
 * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
 */
#define list_prepare_entry(pos, head, member) \
        ((pos) ? : list_entry(head, typeof(*pos), member))

/**
 * list_for_each_entry_continue - continue iteration over list of given type
 * @pos:        the type * to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Continue to iterate over list of given type, continuing after
 * the current position.
 */
#define list_for_each_entry_continue(pos, head, member)                 \
        for (pos = list_entry(pos->member.next, typeof(*pos), member);  \
             prefetch(pos->member.next), &pos->member != (head);        \
             pos = list_entry(pos->member.next, typeof(*pos), member))

/**
 * list_for_each_entry_continue_reverse - iterate backwards from the given point
 * @pos:        the type * to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Start to iterate over list of given type backwards, continuing after
 * the current position.
 */
#define list_for_each_entry_continue_reverse(pos, head, member)         \
        for (pos = list_entry(pos->member.prev, typeof(*pos), member);  \
             prefetch(pos->member.prev), &pos->member != (head);        \
             pos = list_entry(pos->member.prev, typeof(*pos), member))

/**
 * list_for_each_entry_from - iterate over list of given type from the current point
 * @pos:        the type * to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Iterate over list of given type, continuing from current position.
 */
#define list_for_each_entry_from(pos, head, member)                     \
        for (; prefetch(pos->member.next), &pos->member != (head);      \
             pos = list_entry(pos->member.next, typeof(*pos), member))

/**
 * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
 * @pos:        the type * to use as a loop cursor.
 * @n:          another type * to use as temporary storage
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 */
#define list_for_each_entry_safe(pos, n, head, member)                  \
        for (pos = list_entry((head)->next, typeof(*pos), member),      \
                n = list_entry(pos->member.next, typeof(*pos), member); \
             &pos->member != (head);                                    \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))

/**
 * list_for_each_entry_safe_continue
 * @pos:        the type * to use as a loop cursor.
 * @n:          another type * to use as temporary storage
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Iterate over list of given type, continuing after current point,
 * safe against removal of list entry.
 */
#define list_for_each_entry_safe_continue(pos, n, head, member)                 \
        for (pos = list_entry(pos->member.next, typeof(*pos), member),          \
                n = list_entry(pos->member.next, typeof(*pos), member);         \
             &pos->member != (head);                                            \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))

/**
 * list_for_each_entry_safe_from
 * @pos:        the type * to use as a loop cursor.
 * @n:          another type * to use as temporary storage
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Iterate over list of given type from current point, safe against
 * removal of list entry.
 */
#define list_for_each_entry_safe_from(pos, n, head, member)                     \
        for (n = list_entry(pos->member.next, typeof(*pos), member);            \
             &pos->member != (head);                                            \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))

/**
 * list_for_each_entry_safe_reverse
 * @pos:        the type * to use as a loop cursor.
 * @n:          another type * to use as temporary storage
 * @head:       the head for your list.
 * @member:     the name of the list_struct within the struct.
 *
 * Iterate backwards over list of given type, safe against removal
 * of list entry.
 */
#define list_for_each_entry_safe_reverse(pos, n, head, member)          \
        for (pos = list_entry((head)->prev, typeof(*pos), member),      \
                n = list_entry(pos->member.prev, typeof(*pos), member); \
             &pos->member != (head);                                    \
             pos = n, n = list_entry(n->member.prev, typeof(*n), member))

/*
 * Double linked lists with a single pointer list head.
 * Mostly useful for hash tables where the two pointer list head is
 * too wasteful.
 * You lose the ability to access the tail in O(1).
 */

struct hlist_head {
        struct hlist_node *first;
};

struct hlist_node {
        struct hlist_node *next, **pprev;
};

#define HLIST_HEAD_INIT { .first = NULL }
#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
static inline void INIT_HLIST_NODE(struct hlist_node *h)
{
        h->next = NULL;
        h->pprev = NULL;
}

static inline int hlist_unhashed(const struct hlist_node *h)
{
        return !h->pprev;
}

static inline int hlist_empty(const struct hlist_head *h)
{
        return !h->first;
}

static inline void __hlist_del(struct hlist_node *n)
{
        struct hlist_node *next = n->next;
        struct hlist_node **pprev = n->pprev;
        *pprev = next;
        if (next)
                next->pprev = pprev;
}

static inline void hlist_del(struct hlist_node *n)
{
        __hlist_del(n);
        n->next = LIST_POISON1;
        n->pprev = LIST_POISON2;
}

static inline void hlist_del_init(struct hlist_node *n)
{
        if (!hlist_unhashed(n)) {
                __hlist_del(n);
                INIT_HLIST_NODE(n);
        }
}

static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
{
        struct hlist_node *first = h->first;
        n->next = first;
        if (first)
                first->pprev = &n->next;
        h->first = n;
        n->pprev = &h->first;
}

/* next must be != NULL */
static inline void hlist_add_before(struct hlist_node *n,
                                        struct hlist_node *next)
{
        n->pprev = next->pprev;
        n->next = next;
        next->pprev = &n->next;
        *(n->pprev) = n;
}

static inline void hlist_add_after(struct hlist_node *n,
                                        struct hlist_node *next)
{
        next->next = n->next;
        n->next = next;
        next->pprev = &n->next;

        if(next->next)
                next->next->pprev  = &next->next;
}

/*
 * Move a list from one list head to another. Fixup the pprev
 * reference of the first entry if it exists.
 */
static inline void hlist_move_list(struct hlist_head *old,
                                   struct hlist_head *new)
{
        new->first = old->first;
        if (new->first)
                new->first->pprev = &new->first;
        old->first = NULL;
}

#define hlist_entry(ptr, type, member) container_of(ptr,type,member)

#define hlist_for_each(pos, head) \
        for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
             pos = pos->next)

#define hlist_for_each_safe(pos, n, head) \
        for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
             pos = n)

/**
 * hlist_for_each_entry - iterate over list of given type
 * @tpos:       the type * to use as a loop cursor.
 * @pos:        the &struct hlist_node to use as a loop cursor.
 * @head:       the head for your list.
 * @member:     the name of the hlist_node within the struct.
 */
#define hlist_for_each_entry(tpos, pos, head, member)                    \
        for (pos = (head)->first;                                        \
             pos && ({ prefetch(pos->next); 1;}) &&                      \
                ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
             pos = pos->next)

/**
 * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
 * @tpos:       the type * to use as a loop cursor.
 * @pos:        the &struct hlist_node to use as a loop cursor.
 * @member:     the name of the hlist_node within the struct.
 */
#define hlist_for_each_entry_continue(tpos, pos, member)                 \
        for (pos = (pos)->next;                                          \
             pos && ({ prefetch(pos->next); 1;}) &&                      \
                ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
             pos = pos->next)

/**
 * hlist_for_each_entry_from - iterate over a hlist continuing from current point
 * @tpos:       the type * to use as a loop cursor.
 * @pos:        the &struct hlist_node to use as a loop cursor.
 * @member:     the name of the hlist_node within the struct.
 */
#define hlist_for_each_entry_from(tpos, pos, member)                     \
        for (; pos && ({ prefetch(pos->next); 1;}) &&                    \
                ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
             pos = pos->next)

/**
 * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
 * @tpos:       the type * to use as a loop cursor.
 * @pos:        the &struct hlist_node to use as a loop cursor.
 * @n:          another &struct hlist_node to use as temporary storage
 * @head:       the head for your list.
 * @member:     the name of the hlist_node within the struct.
 */
#define hlist_for_each_entry_safe(tpos, pos, n, head, member)            \
        for (pos = (head)->first;                                        \
             pos && ({ n = pos->next; 1; }) &&                           \
                ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
             pos = n)

#endif