[PATCH 35/74] backports: add memset_after/memset_startat

From: Johannes Berg <[email protected]>

Signed-off-by: Johannes Berg <[email protected]>
---
 backport/backport-include/linux/string.h | 26 ++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 backport/backport-include/linux/string.h

diff --git a/backport/backport-include/linux/string.h b/backport/backport-include/linux/string.h
new file mode 100644
index 000000000000..ce4c99e34e0d
--- /dev/null
+++ b/backport/backport-include/linux/string.h
@@ -0,0 +1,26 @@
+#ifndef __BACKPORT_LINUX_STRING_H
+#define __BACKPORT_LINUX_STRING_H
+#include_next <linux/string.h>
+#include <linux/version.h>
+
+#ifndef memset_after
+#define memset_after(obj, v, member)					\
+({									\
+	u8 *__ptr = (u8 *)(obj);					\
+	typeof(v) __val = (v);						\
+	memset(__ptr + offsetofend(typeof(*(obj)), member), __val,	\
+	       sizeof(*(obj)) - offsetofend(typeof(*(obj)), member));	\
+})
+#endif
+
+#ifndef memset_startat
+#define memset_startat(obj, v, member)					\
+({									\
+	u8 *__ptr = (u8 *)(obj);					\
+	typeof(v) __val = (v);						\
+	memset(__ptr + offsetof(typeof(*(obj)), member), __val,		\
+	       sizeof(*(obj)) - offsetof(typeof(*(obj)), member));	\
+})
+#endif
+
+#endif /* __BACKPORT_LINUX_STRING_H */
-- 
2.45.1