[PATCH 12/38] backports: add memset_after/memset_startat

From: Johannes Berg <[email protected]>

Signed-off-by: Johannes Berg <[email protected]>
---
 backport/backport-include/linux/string.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/backport/backport-include/linux/string.h b/backport/backport-include/linux/string.h
index 39257e5f66ab..dc29dcf72b24 100644
--- a/backport/backport-include/linux/string.h
+++ b/backport/backport-include/linux/string.h
@@ -12,4 +12,24 @@ extern void *memdup_user_nul(const void __user *, size_t);
 int match_string(const char * const *array, size_t n, const char *string);
 #endif /* LINUX_VERSION_IS_LESS(4,5,0) */
 
+#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 */
-- 
2.37.3

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