* Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
-#include <lttng/kernel-version.h>
-
-#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)))
+#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
#include <linux/mm_types.h>
}
EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
-#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)
+/*
+ * 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)
{
- get_pageblock_flags_mask_sym =
- (void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
- if (!get_pageblock_flags_mask_sym)
- return -1;
- return 0;
+ return get_pfnblock_flags_mask(page, pfn, end_bitidx, mask);
}
-EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
#else