The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/_vm_radix.h

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    1 /*
    2  * Copyright (c) 2013 EMC Corp.
    3  * Copyright (c) 2011 Jeffrey Roberson <jeff@freebsd.org>
    4  * Copyright (c) 2008 Mayur Shardul <mayur.shardul@gmail.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/10.0/sys/vm/_vm_radix.h 254141 2013-08-09 11:28:55Z attilio $
   29  */
   30 
   31 #ifndef __VM_RADIX_H_
   32 #define __VM_RADIX_H_
   33 
   34 /*
   35  * Radix tree root.
   36  */
   37 struct vm_radix {
   38         uintptr_t       rt_root;
   39         uint8_t         rt_flags;
   40 };
   41 
   42 #define RT_INSERT_INPROG        0x01
   43 #define RT_TRIE_MODIFIED        0x02
   44 
   45 #ifdef _KERNEL
   46 
   47 static __inline boolean_t
   48 vm_radix_is_empty(struct vm_radix *rtree)
   49 {
   50 
   51         return (rtree->rt_root == 0);
   52 }
   53 
   54 #endif /* _KERNEL */
   55 #endif /* !__VM_RADIX_H_ */

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