Cleanup: Move all source files to src/

[lttng-modules.git] / src / wrapper / page_alloc.c

diff --git a/src/wrapper/page_alloc.c b/src/wrapper/page_alloc.c
new file mode 100644 (file)
index 0000000..93504c9
--- /dev/null
+++ b/src/wrapper/page_alloc.c
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ * wrapper/page_alloc.c
+ *
+ * wrapper around get_pfnblock_flags_mask and Ubuntu
+ * get_pageblock_flags_mask. Using KALLSYMS to get their 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>
+ */
+
+#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)))
+
+#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_pfnblock_flags_mask_sym)(struct page *page,
+               unsigned long pfn,
+               unsigned long end_bitidx,
+               unsigned long mask);
+
+unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
+               unsigned long pfn,
+               unsigned long end_bitidx,
+               unsigned long mask)
+{
+       WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
+       if (get_pfnblock_flags_mask_sym) {
+               return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask);
+       } else {
+               return -ENOSYS;
+       }
+}
+EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask);
+
+int wrapper_get_pfnblock_flags_mask_init(void)
+{
+       get_pfnblock_flags_mask_sym =
+               (void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask");
+       if (!get_pfnblock_flags_mask_sym)
+               return -1;
+       return 0;
+}
+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)
+{
+       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);
+
+#else
+
+#include <linux/pageblock-flags.h>
+
+#endif