1 files changed, 24 insertions, 0 deletions
diff --git a/backport/compat/backport-4.10.c b/backport/compat/backport-4.10.c
index b4d7edea..4c8125fb 100644
--- a/backport/compat/backport-4.10.c
+++ b/backport/compat/backport-4.10.c
@@ -14,6 +14,30 @@
 #include <linux/mii.h>
 
 #if LINUX_VERSION_IS_GEQ(4,6,0)
+#if LINUX_VERSION_IS_LESS(4,7,0)
+static bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
+						    const unsigned long *src)
+{
+	bool retval = true;
+
+	/* TODO: following test will soon always be true */
+	if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
+		__ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
+
+		bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
+		bitmap_fill(ext, 32);
+		bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
+		if (bitmap_intersects(ext, src,
+				      __ETHTOOL_LINK_MODE_MASK_NBITS)) {
+			/* src mask goes beyond bit 31 */
+			retval = false;
+		}
+	}
+	*legacy_u32 = src[0];
+	return retval;
+}
+#endif
+
 static u32 mii_get_an(struct mii_if_info *mii, u16 addr)
 {
 	int advert;