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

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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