+EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
+
+/*
+ * Canary function to check for 'get_pfnblock_flags_mask()' at compile time.
+ *
+ * From 'include/linux/pageblock-flags.h':
+ *
+ * unsigned long get_pfnblock_flags_mask(struct page *page,
+ * unsigned long pfn,
+ * unsigned long end_bitidx,
+ * unsigned long mask);
+ */
+__attribute__((unused)) static
+unsigned long __canary__get_pfnblock_flags_mask(struct page *page,
+ unsigned long pfn,
+ unsigned long end_bitidx,
+ unsigned long mask)
+{
+ return get_pfnblock_flags_mask(page, pfn, end_bitidx, mask);
+}
+
+#else
+
+#include <linux/pageblock-flags.h>
+
+#endif
+
+#if (defined(CONFIG_KALLSYMS) \
+ && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
+
+#include <linux/kallsyms.h>
+#include <linux/mm_types.h>
+#include <linux/module.h>
+#include <wrapper/kallsyms.h>
+#include <wrapper/page_alloc.h>
+
+static
+unsigned long (*get_pageblock_flags_mask_sym)(struct page *page,
+ unsigned long end_bitidx,
+ unsigned long mask);
+
+unsigned long wrapper_get_pageblock_flags_mask(struct page *page,
+ unsigned long end_bitidx,
+ unsigned long mask)
+{
+ WARN_ON_ONCE(!get_pageblock_flags_mask_sym);
+ if (get_pageblock_flags_mask_sym) {
+ return get_pageblock_flags_mask_sym(page, end_bitidx, mask);
+ } else {
+ return -ENOSYS;
+ }
+}
+EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask);
+
+int wrapper_get_pageblock_flags_mask_init(void)
+{
+ get_pageblock_flags_mask_sym =
+ (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
+ if (!get_pageblock_flags_mask_sym)
+ return -1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);