include/linux/page_compat.h

   1 #ifndef _ZFS_PAGE_COMPAT_H
   2 #define _ZFS_PAGE_COMPAT_H
   3
   4 /*
   5  * We have various enum members moving between two separate enum types,
   6  * and accessed by different functions at various times. Centralise the
   7  * insanity.
   8  *
   9  * < v4.8: all enums in zone_stat_item, via global_page_state()
  10  * v4.8: some enums moved to node_stat_item, global_node_page_state() introduced
  11  * v4.13: some enums moved from zone_stat_item to node_state_item
  12  * v4.14: global_page_state() rename to global_zone_page_state()
  13  *
  14  * The defines used here are created by config/kernel-global_page_state.m4
  15  */
  16
  17 /*
  18  * Create our own accessor functions to follow the Linux API changes
  19  */
  20 #if     defined(ZFS_GLOBAL_ZONE_PAGE_STATE)
  21
  22 /* global_zone_page_state() introduced */
  23 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_FILE_PAGES)
  24 #define nr_file_pages() global_node_page_state(NR_FILE_PAGES)
  25 #else
  26 #define nr_file_pages() global_zone_page_state(NR_FILE_PAGES)
  27 #endif
  28 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_ANON)
  29 #define nr_inactive_anon_pages() global_node_page_state(NR_INACTIVE_ANON)
  30 #else
  31 #define nr_inactive_anon_pages() global_zone_page_state(NR_INACTIVE_ANON)
  32 #endif
  33 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_FILE)
  34 #define nr_inactive_file_pages() global_node_page_state(NR_INACTIVE_FILE)
  35 #else
  36 #define nr_inactive_file_pages() global_zone_page_state(NR_INACTIVE_FILE)
  37 #endif
  38 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
  39 #define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
  40 #else
  41 #define nr_slab_reclaimable_pages() global_zone_page_state(NR_SLAB_RECLAIMABLE)
  42 #endif
  43
  44 #elif   defined(ZFS_GLOBAL_NODE_PAGE_STATE)
  45
  46 /* global_node_page_state() introduced */
  47 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_FILE_PAGES)
  48 #define nr_file_pages() global_node_page_state(NR_FILE_PAGES)
  49 #else
  50 #define nr_file_pages() global_page_state(NR_FILE_PAGES)
  51 #endif
  52 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_ANON)
  53 #define nr_inactive_anon_pages() global_node_page_state(NR_INACTIVE_ANON)
  54 #else
  55 #define nr_inactive_anon_pages() global_page_state(NR_INACTIVE_ANON)
  56 #endif
  57 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_FILE)
  58 #define nr_inactive_file_pages() global_node_page_state(NR_INACTIVE_FILE)
  59 #else
  60 #define nr_inactive_file_pages() global_page_state(NR_INACTIVE_FILE)
  61 #endif
  62 #if     defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
  63 #define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
  64 #else
  65 #define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE)
  66 #endif
  67
  68 #else
  69
  70 /* global_page_state() only */
  71 #define nr_file_pages()                 global_page_state(NR_FILE_PAGES)
  72 #define nr_inactive_anon_pages()        global_page_state(NR_INACTIVE_ANON)
  73 #define nr_inactive_file_pages()        global_page_state(NR_INACTIVE_FILE)
  74 #define nr_slab_reclaimable_pages()     global_page_state(NR_SLAB_RECLAIMABLE)
  75
  76 #endif /* ZFS_GLOBAL_ZONE_PAGE_STATE */
  77
  78 #endif /* _ZFS_PAGE_COMPAT_H */