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@@ -20,4 +20,13 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
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sg_set_buf(sg, buf, buflen);
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}
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+#define sg_next(sg) ((sg) + 1)
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+#define sg_last(sg, nents) (&(sg[(nents) - 1]))
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+
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+/*
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+ * Loop over each sg element, following the pointer to a new list if necessary
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+ */
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+#define for_each_sg(sglist, sg, nr, __i) \
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+ for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
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+
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#endif /* _LINUX_SCATTERLIST_H */
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