wrapper/page_alloc.h

   1 #ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H
   2 #define _LTTNG_WRAPPER_PAGE_ALLOC_H
   3
   4 /*
   5  * wrapper/page_alloc.h
   6  *
   7  * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address
   8  * when available, else we need to have a kernel that exports this function to
   9  * GPL modules.
  10  *
  11  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  12  *
  13  * This library is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation; only
  16  * version 2.1 of the License.
  17  *
  18  * This library is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with this library; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 #include <lttng-kernel-version.h>
  29
  30 /*
  31  * We need to redefine get_pfnblock_flags_mask to our wrapper, because
  32  * the get_pageblock_migratetype() macro uses it.
  33  */
  34 #if (defined(CONFIG_KALLSYMS) \
  35         && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)        \
  36                 || LTTNG_KERNEL_RANGE(3,14,36, 3,15,0)          \
  37                 || LTTNG_KERNEL_RANGE(3,18,10, 3,19,0)          \
  38                 || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \
  39                 || LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0)))
  40
  41 #define get_pfnblock_flags_mask         wrapper_get_pfnblock_flags_mask
  42
  43 #include <linux/mm_types.h>
  44
  45 int wrapper_get_pfnblock_flags_mask_init(void);
  46
  47 #else
  48
  49 #include <linux/mm_types.h>
  50
  51 static inline
  52 int wrapper_get_pfnblock_flags_mask_init(void)
  53 {
  54         return 0;
  55 }
  56
  57 #endif
  58
  59 /*
  60  * For a specific range of Ubuntu 3.13 kernels, we need to redefine
  61  * get_pageblock_flags_mask to our wrapper, because the
  62  * get_pageblock_migratetype() macro uses it. This function has been
  63  * introduced into mainline within commit
  64  * e58469bafd0524e848c3733bc3918d854595e20f, but never actually showed
  65  * up in a stable kernel version, since it has been changed by commit
  66  * dc4b0caff24d9b2918e9f27bc65499ee63187eba. Since Ubuntu chose to only
  67  * backport the former commit but not the latter, we need to do a
  68  * special case to cover this.
  69  */
  70 #if (defined(CONFIG_KALLSYMS) \
  71         && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
  72
  73 #define get_pageblock_flags_mask        wrapper_get_pageblock_flags_mask
  74
  75 #include <linux/mm_types.h>
  76
  77 int wrapper_get_pageblock_flags_mask_init(void);
  78
  79 #else
  80
  81 #include <linux/mm_types.h>
  82
  83 static inline
  84 int wrapper_get_pageblock_flags_mask_init(void)
  85 {
  86         return 0;
  87 }
  88
  89 #endif
  90
  91 #endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */