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      1 /*	$NetBSD: gfp.h,v 1.3 2021/12/19 11:03:32 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_LINUX_GFP_H_
     33 #define	_LINUX_GFP_H_
     34 
     35 /* GFP: `Get Free Page' */
     36 
     37 #include <sys/param.h>
     38 #include <sys/cdefs.h>
     39 
     40 typedef int gfp_t;
     41 
     42 #define	GFP_ATOMIC	(__GFP_HIGH)
     43 #define	GFP_DMA32	(__GFP_DMA32)
     44 #define	GFP_HIGHUSER	(__GFP_FS | __GFP_HARDWALL | __GFP_HIGHMEM | \
     45 			    __GFP_IO | __GFP_WAIT)
     46 #define	GFP_KERNEL	(__GFP_FS | __GFP_IO | __GFP_WAIT)
     47 #define	GFP_TEMPORARY	(__GFP_FS | __GFP_IO | __GFP_RECLAIMABLE | __GFP_WAIT)
     48 #define	GFP_USER	(__GFP_FS | __GFP_HARDWALL | __GFP_IO | __GFP_WAIT)
     49 
     50 #define	GFP_NOWAIT	(GFP_ATOMIC & ~__GFP_HIGH)
     51 
     52 #define	__GFP_COMP		__BIT(0)
     53 #define	__GFP_DMA32		__BIT(1)
     54 #define	__GFP_FS		__BIT(2)
     55 #define	__GFP_HARDWALL		__BIT(3)
     56 #define	__GFP_HIGH		__BIT(4)
     57 #define	__GFP_HIGHMEM		__BIT(5)
     58 #define	__GFP_IO		__BIT(6)
     59 #define	__GFP_NORETRY		__BIT(7)
     60 #define	__GFP_NOWARN		__BIT(8)
     61 #define	__GFP_NO_KSWAPD		__BIT(9)
     62 #define	__GFP_RECLAIMABLE	__BIT(10)
     63 #define	__GFP_WAIT		__BIT(11)
     64 #define	__GFP_ZERO		__BIT(12)
     65 
     66 /*
     67  * XXX Linux sez nobody should be using this in new code.  We never
     68  * fail in the wait case anyway, so the point is moot.
     69  */
     70 #define	__GFP_NOFAIL		0
     71 
     72 /*
     73  * Pretend these are the same.  __GFP_RETRY_MAYFAIL is supposed to do
     74  * more than just __GFP_NORETRY, but should not hang forever like
     75  * __GFP_WAIT.
     76  */
     77 #define	__GFP_RETRY_MAYFAIL	__GFP_NORETRY
     78 
     79 struct page;
     80 
     81 static inline bool
     82 gfpflags_allow_blocking(gfp_t gfp)
     83 {
     84 	return (gfp & (__GFP_WAIT|__GFP_NORETRY)) == __GFP_WAIT;
     85 }
     86 
     87 #endif	/* _LINUX_GFP_H_ */
     88