From dafacea0f6aa74998c69f0da7a2d53e56a8c0e1b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 6 Sep 2018 08:57:46 +0200
Subject: backport-include: backport kvmalloc and kvmalloc_array

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 backport/backport-include/linux/mm.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/backport/backport-include/linux/mm.h b/backport/backport-include/linux/mm.h
index 3234b37d..6ee5c7d8 100644
--- a/backport/backport-include/linux/mm.h
+++ b/backport/backport-include/linux/mm.h
@@ -3,6 +3,9 @@
 #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>
 
 #ifndef VM_NODUMP
 /*
@@ -123,4 +126,36 @@ static inline bool page_is_pfmemalloc(struct page *page)
 }
 #endif /* < 4.2 */
 
+#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);
+}
+#endif
+
 #endif /* __BACKPORT_MM_H */
-- 
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