drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * libcfs/include/libcfs/linux/linux-mem.h
  37  *
  38  * Basic library routines.
  39  */
  40
  41 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
  42 #define __LIBCFS_LINUX_CFS_MEM_H__
  43
  44 #ifndef __LIBCFS_LIBCFS_H__
  45 #error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead
  46 #endif
  47
  48 #include <linux/mm.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/pagemap.h>
  51 #include <linux/slab.h>
  52 #include <linux/memcontrol.h>
  53 #include <linux/mm_inline.h>
  54
  55 #ifndef HAVE_LIBCFS_CPT
  56 /* Need this for cfs_cpt_table */
  57 #include "../libcfs_cpu.h"
  58 #endif
  59
  60 #define CFS_PAGE_MASK              (~((__u64)PAGE_SIZE-1))
  61 #define page_index(p)       ((p)->index)
  62
  63 #define memory_pressure_get() (current->flags & PF_MEMALLOC)
  64 #define memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
  65 #define memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
  66
  67 #if BITS_PER_LONG == 32
  68 /* limit to lowmem on 32-bit systems */
  69 #define NUM_CACHEPAGES \
  70         min(totalram_pages, 1UL << (30 - PAGE_SHIFT) * 3 / 4)
  71 #else
  72 #define NUM_CACHEPAGES totalram_pages
  73 #endif
  74
  75 #define DECL_MMSPACE            mm_segment_t __oldfs
  76 #define MMSPACE_OPEN \
  77         do { __oldfs = get_fs(); set_fs(get_ds()); } while (0)
  78 #define MMSPACE_CLOSE          set_fs(__oldfs)
  79
  80 #endif /* __LINUX_CFS_MEM_H__ */