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         LTTNG_RHEL_KERNEL_RANGE(5,14,0,452,0,0, 5,15,0,0,0,0))
  18 static inline
  19 void wrapper_vm_flags_set(struct vm_area_struct *vma,
  20                 vm_flags_t flags)
  21 {
  22         vm_flags_set(vma, flags);
  23 }
  24 #else
  25 static inline
  26 void wrapper_vm_flags_set(struct vm_area_struct *vma,
  27                 vm_flags_t flags)
  28 {
  29         vma->vm_flags |= flags;
  30 }
  31 #endif
  32
  33 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0) \
  34                 || LTTNG_UBUNTU_KERNEL_RANGE(4,4,25,44, 4,5,0,0))
  35
  36 /*
  37  * Returns true if the current estimation of the number of page available is
  38  * larger than the number of pages passed as parameter.
  39  */
  40 static inline
  41 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  42 {
  43         return num_pages < si_mem_available();
  44 }
  45
  46 #else
  47
  48 static inline
  49 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  50 {
  51         /*
  52          * The si_mem_available function is not available on this kernel. Since
  53          * we can't reliably know if there is enough memory available, so we
  54          * return true.
  55          */
  56         return true;
  57 }
  58 #endif
  59
  60 #endif /* _LTTNG_WRAPPER_MM_H */