drm_linux_list_sort.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2011 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Konstantin Belousov under sponsorship from
    8  * the FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <dev/drm2/drmP.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 struct drm_list_sort_thunk {
   36         int (*cmp)(void *, struct list_head *, struct list_head *);
   37         void *priv;
   38 };
   39 
   40 static int
   41 drm_le_cmp(void *priv, const void *d1, const void *d2)
   42 {
   43         struct list_head *le1, *le2;
   44         struct drm_list_sort_thunk *thunk;
   45 
   46         thunk = priv;
   47         le1 = *(__DECONST(struct list_head **, d1));
   48         le2 = *(__DECONST(struct list_head **, d2));
   49         return ((thunk->cmp)(thunk->priv, le1, le2));
   50 }
   51 
   52 /*
   53  * Punt and use array sort.
   54  */
   55 void
   56 drm_list_sort(void *priv, struct list_head *head, int (*cmp)(void *priv,
   57     struct list_head *a, struct list_head *b))
   58 {
   59         struct drm_list_sort_thunk thunk;
   60         struct list_head **ar, *le;
   61         int count, i;
   62 
   63         count = 0;
   64         list_for_each(le, head)
   65                 count++;
   66         ar = malloc(sizeof(struct list_head *) * count, M_TEMP, M_WAITOK);
   67         i = 0;
   68         list_for_each(le, head)
   69                 ar[i++] = le;
   70         thunk.cmp = cmp;
   71         thunk.priv = priv;
   72         qsort_r(ar, count, sizeof(struct list_head *), &thunk, drm_le_cmp);
   73         INIT_LIST_HEAD(head);
   74         for (i = 0; i < count; i++)
   75                 list_add_tail(ar[i], head);
   76         free(ar, M_TEMP);
   77 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm2/drm_linux_list_sort.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_linux_list_sort.c