[PATCH] backports: backport sg_init_marker()

[PATCH] backports: backport sg_init_marker()

[Felix Fietkau]

It is used by new mt76 changes

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 backport/backport-include/linux/scatterlist.h | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/backport/backport-include/linux/scatterlist.h b/backport/backport-include/linux/scatterlist.h
index bfc74494..06934b6b 100644
--- a/backport/backport-include/linux/scatterlist.h
+++ b/backport/backport-include/linux/scatterlist.h
@@ -102,4 +102,27 @@ size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
 
 #endif /* LINUX_VERSION_IS_LESS(3, 11, 0) */
 
+#if LINUX_VERSION_IS_LESS(4, 17, 0)
+
+#define sg_init_marker LINUX_BACKPORT(sg_init_marker)
+/**
+ * sg_init_marker - Initialize markers in sg table
+ * @sgl:	   The SG table
+ * @nents:	   Number of entries in table
+ *
+ **/
+static inline void sg_init_marker(struct scatterlist *sgl,
+				  unsigned int nents)
+{
+#ifdef CONFIG_DEBUG_SG
+	unsigned int i;
+
+	for (i = 0; i < nents; i++)
+		sgl[i].sg_magic = SG_MAGIC;
+#endif
+	sg_mark_end(&sgl[nents - 1]);
+}
+
+#endif /* LINUX_VERSION_IS_LESS(4, 17, 0) */
+
 #endif /* __BACKPORT_SCATTERLIST_H */
-- 
2.17.0

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