Cleanup: Move wrapper/ headers to include/wrapper/

[lttng-modules.git] / include / wrapper / page_alloc.h

diff --git a/include/wrapper/page_alloc.h b/include/wrapper/page_alloc.h
new file mode 100644 (file)
index 0000000..7669125
--- /dev/null
+++ b/include/wrapper/page_alloc.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/page_alloc.h
+ *
+ * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address
+ * when available, else we need to have a kernel that exports this function to
+ * GPL modules.
+ *
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H
+#define _LTTNG_WRAPPER_PAGE_ALLOC_H
+
+#include <lttng/kernel-version.h>
+
+/*
+ * We need to redefine get_pfnblock_flags_mask to our wrapper, because
+ * the get_pageblock_migratetype() macro uses it.
+ */
+#if (defined(CONFIG_KALLSYMS) \
+       && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)        \
+               || LTTNG_KERNEL_RANGE(3,14,36, 3,15,0)          \
+               || LTTNG_KERNEL_RANGE(3,18,10, 3,19,0)          \
+               || LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \
+               || LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0)))
+
+#define get_pfnblock_flags_mask                wrapper_get_pfnblock_flags_mask
+
+#include <linux/mm_types.h>
+
+int wrapper_get_pfnblock_flags_mask_init(void);
+
+#else
+
+#include <linux/mm_types.h>
+
+static inline
+int wrapper_get_pfnblock_flags_mask_init(void)
+{
+       return 0;
+}
+
+#endif
+
+/*
+ * For a specific range of Ubuntu 3.13 kernels, we need to redefine
+ * get_pageblock_flags_mask to our wrapper, because the
+ * get_pageblock_migratetype() macro uses it. This function has been
+ * introduced into mainline within commit
+ * e58469bafd0524e848c3733bc3918d854595e20f, but never actually showed
+ * up in a stable kernel version, since it has been changed by commit
+ * dc4b0caff24d9b2918e9f27bc65499ee63187eba. Since Ubuntu chose to only
+ * backport the former commit but not the latter, we need to do a
+ * special case to cover this.
+ */
+#if (defined(CONFIG_KALLSYMS) \
+       && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
+
+#define get_pageblock_flags_mask       wrapper_get_pageblock_flags_mask
+
+#include <linux/mm_types.h>
+
+int wrapper_get_pageblock_flags_mask_init(void);
+
+#else
+
+#include <linux/mm_types.h>
+
+static inline
+int wrapper_get_pageblock_flags_mask_init(void)
+{
+       return 0;
+}
+
+#endif
+
+#endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */