Implement wrapper around get_pfnblock_flags_mask

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

diff --git a/wrapper/page_alloc.h b/wrapper/page_alloc.h
new file mode 100644 (file)
index 0000000..06e2ddc
--- /dev/null
+++ b/wrapper/page_alloc.h
@@ -0,0 +1,54 @@
+#ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H
+#define _LTTNG_WRAPPER_PAGE_ALLOC_H
+
+/*
+ * 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>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#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))
+
+#define get_pfnblock_flags_mask                wrapper_get_pfnblock_flags_mask
+
+#include <linux/mm_types.h>
+
+int wrapper_get_pfnblock_flags_mask_init(void);
+
+#else /* #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */
+
+#include <linux/mm_types.h>
+
+static inline
+int wrapper_get_pfnblock_flags_mask_init(void)
+{
+       return 0;
+}
+
+#endif /* else #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) */
+
+#endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */