include/wrapper/page_alloc.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * wrapper/page_alloc.h
   4  *
   5  * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address
   6  * when available, else we need to have a kernel that exports this function to
   7  * GPL modules.
   8  *
   9  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  */
  11
  12 #ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H
  13 #define _LTTNG_WRAPPER_PAGE_ALLOC_H
  14
  15 #include <linux/mm_types.h>
  16
  17 /*
  18  * We need to redefine get_pfnblock_flags_mask to our wrapper, because
  19  * the get_pageblock_migratetype() macro uses it.
  20  */
  21 #ifdef CONFIG_KALLSYMS
  22
  23 #define get_pfnblock_flags_mask         wrapper_get_pfnblock_flags_mask
  24
  25 int wrapper_get_pfnblock_flags_mask_init(void);
  26
  27 #else
  28
  29 static inline
  30 int wrapper_get_pfnblock_flags_mask_init(void)
  31 {
  32         return 0;
  33 }
  34
  35 #endif
  36
  37 #endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */