include/wrapper/mm.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * wrapper/mm.h
   4  *
   5  * Copyright (C) 2018 Francis Deslauriers <francis.deslauriers@efficios.com>
   6  */
   7
   8 #ifndef _LTTNG_WRAPPER_MM_H
   9 #define _LTTNG_WRAPPER_MM_H
  10
  11 #include <linux/mm.h>
  12 #include <linux/oom.h>
  13
  14 #include <lttng/kernel-version.h>
  15
  16 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,3,0))
  17 static inline
  18 void wrapper_vm_flags_set(struct vm_area_struct *vma,
  19                 vm_flags_t flags)
  20 {
  21         vm_flags_set(vma, flags);
  22 }
  23 #else
  24 static inline
  25 void wrapper_vm_flags_set(struct vm_area_struct *vma,
  26                 vm_flags_t flags)
  27 {
  28         vma->vm_flags |= flags;
  29 }
  30 #endif
  31
  32 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0) \
  33                 || LTTNG_UBUNTU_KERNEL_RANGE(4,4,25,44, 4,5,0,0))
  34
  35 /*
  36  * Returns true if the current estimation of the number of page available is
  37  * larger than the number of pages passed as parameter.
  38  */
  39 static inline
  40 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  41 {
  42         return num_pages < si_mem_available();
  43 }
  44
  45 #else
  46
  47 static inline
  48 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  49 {
  50         /*
  51          * The si_mem_available function is not available on this kernel. Since
  52          * we can't reliably know if there is enough memory available, so we
  53          * return true.
  54          */
  55         return true;
  56 }
  57 #endif
  58
  59 #endif /* _LTTNG_WRAPPER_MM_H */