Fix: implicit declarations caused by buffer size checks.

[lttng-modules.git] / wrapper / mm.h

diff --git a/wrapper/mm.h b/wrapper/mm.h
new file mode 100644 (file)
index 0000000..672855b
--- /dev/null
+++ b/wrapper/mm.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * wrapper/mm.h
+ *
+ * Copyright (C) 2018 Francis Deslauriers <francis.deslauriers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_MM_H
+#define _LTTNG_WRAPPER_MM_H
+
+#include <linux/mm.h>
+#include <linux/oom.h>
+
+#include <lttng-kernel-version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0) \
+               || LTTNG_UBUNTU_KERNEL_RANGE(4,4,25,44, 4,5,0,0))
+
+/*
+ * Returns true if the current estimation of the number of page available is
+ * larger than the number of pages passed as parameter.
+ */
+static inline
+bool wrapper_check_enough_free_pages(unsigned long num_pages)
+{
+       return num_pages < si_mem_available();
+}
+
+#else
+
+static inline
+bool wrapper_check_enough_free_pages(unsigned long num_pages)
+{
+       /*
+        * The si_mem_available function is not available on this kernel. Since
+        * we can't reliably know if there is enough memory available, so we
+        * return true.
+        */
+       return true;
+}
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
+static inline
+void wrapper_set_current_oom_origin(void)
+{
+       return set_current_oom_origin();
+}
+
+static inline
+void wrapper_clear_current_oom_origin(void)
+{
+       return clear_current_oom_origin();
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */
+
+static inline
+void wrapper_set_current_oom_origin(void)
+{
+       return;
+}
+
+static inline
+void wrapper_clear_current_oom_origin()
+{
+       return;
+}
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */
+#endif /* _LTTNG_WRAPPER_MM_H */