1 files changed, 61 insertions, 0 deletions
diff --git a/backport-include/linux/mm.h b/backport-include/linux/mm.h
new file mode 100644
index 0000000..8ff7d6a
--- /dev/null
+++ b/backport-include/linux/mm.h
@@ -0,0 +1,61 @@
+#ifndef __BACKPORT_MM_H
+#define __BACKPORT_MM_H
+#include_next <linux/mm.h>
+#include <linux/page_ref.h>
+#include <linux/sched.h>
+#include <linux/overflow.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+
+#if LINUX_VERSION_IS_LESS(3,15,0)
+#define kvfree LINUX_BACKPORT(kvfree)
+void kvfree(const void *addr);
+#endif /* < 3.15 */
+
+#if LINUX_VERSION_IS_LESS(4,12,0)
+#define kvmalloc LINUX_BACKPORT(kvmalloc)
+static inline void *kvmalloc(size_t size, gfp_t flags)
+{
+	gfp_t kmalloc_flags = flags;
+	void *ret;
+
+	if ((flags & GFP_KERNEL) != GFP_KERNEL)
+		return kmalloc(size, flags);
+
+	if (size > PAGE_SIZE)
+		kmalloc_flags |= __GFP_NOWARN | __GFP_NORETRY;
+
+	ret = kmalloc(size, flags);
+	if (ret || size < PAGE_SIZE)
+		return ret;
+
+	return vmalloc(size);
+}
+
+#define kvmalloc_array LINUX_BACKPORT(kvmalloc_array)
+static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
+{
+	size_t bytes;
+
+	if (unlikely(check_mul_overflow(n, size, &bytes)))
+		return NULL;
+
+	return kvmalloc(bytes, flags);
+}
+
+#define kvzalloc LINUX_BACKPORT(kvzalloc)
+static inline void *kvzalloc(size_t size, gfp_t flags)
+{
+	return kvmalloc(size, flags | __GFP_ZERO);
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,18,0)
+#define kvcalloc LINUX_BACKPORT(kvcalloc)
+static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
+{
+	return kvmalloc_array(n, size, flags | __GFP_ZERO);
+}
+#endif /* < 4.18 */
+
+#endif /* __BACKPORT_MM_H */