LXR linux/mm/shuffle.h

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright(c) 2018 Intel Corporation. All rights reserved.
   3#ifndef _MM_SHUFFLE_H
   4#define _MM_SHUFFLE_H
   5#include <linux/jump_label.h>
   6
   7/*
   8 * SHUFFLE_ENABLE is called from the command line enabling path, or by
   9 * platform-firmware enabling that indicates the presence of a
  10 * direct-mapped memory-side-cache. SHUFFLE_FORCE_DISABLE is called from
  11 * the command line path and overrides any previous or future
  12 * SHUFFLE_ENABLE.
  13 */
  14enum mm_shuffle_ctl {
  15        SHUFFLE_ENABLE,
  16        SHUFFLE_FORCE_DISABLE,
  17};
  18
  19#define SHUFFLE_ORDER (MAX_ORDER-1)
  20
  21#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
  22DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
  23extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl);
  24extern void __shuffle_free_memory(pg_data_t *pgdat);
  25static inline void shuffle_free_memory(pg_data_t *pgdat)
  26{
  27        if (!static_branch_unlikely(&page_alloc_shuffle_key))
  28                return;
  29        __shuffle_free_memory(pgdat);
  30}
  31
  32extern void __shuffle_zone(struct zone *z);
  33static inline void shuffle_zone(struct zone *z)
  34{
  35        if (!static_branch_unlikely(&page_alloc_shuffle_key))
  36                return;
  37        __shuffle_zone(z);
  38}
  39
  40static inline bool is_shuffle_order(int order)
  41{
  42        if (!static_branch_unlikely(&page_alloc_shuffle_key))
  43                return false;
  44        return order >= SHUFFLE_ORDER;
  45}
  46#else
  47static inline void shuffle_free_memory(pg_data_t *pgdat)
  48{
  49}
  50
  51static inline void shuffle_zone(struct zone *z)
  52{
  53}
  54
  55static inline void page_alloc_shuffle(enum mm_shuffle_ctl ctl)
  56{
  57}
  58
  59static inline bool is_shuffle_order(int order)
  60{
  61        return false;
  62}
  63#endif
  64#endif /* _MM_SHUFFLE_H */
  65