add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/caif/cfpkt_skbuff.c
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@@ -1,7 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) ST-Ericsson AB 2010
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  * Author:	Sjur Brendeland
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- * License terms: GNU General Public License (GPL) version 2
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  */
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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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@@ -319,16 +319,12 @@
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 		if (tmppkt == NULL)
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 			return NULL;
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 		tmp = pkt_to_skb(tmppkt);
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-		skb_set_tail_pointer(tmp, dstlen);
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-		tmp->len = dstlen;
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-		memcpy(tmp->data, dst->data, dstlen);
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+		skb_put_data(tmp, dst->data, dstlen);
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 		cfpkt_destroy(dstpkt);
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 		dst = tmp;
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 	}
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-	memcpy(skb_tail_pointer(dst), add->data, skb_headlen(add));
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+	skb_put_data(dst, add->data, skb_headlen(add));
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 	cfpkt_destroy(addpkt);
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-	dst->tail += addlen;
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-	dst->len += addlen;
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 	return skb_to_pkt(dst);
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 }
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@@ -359,13 +355,11 @@
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 	if (skb2 == NULL)
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 		return NULL;
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-	/* Reduce the length of the original packet */
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-	skb_set_tail_pointer(skb, pos);
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-	skb->len = pos;
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+	skb_put_data(skb2, split, len2nd);
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-	memcpy(skb2->data, split, len2nd);
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-	skb2->tail += len2nd;
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-	skb2->len += len2nd;
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+	/* Reduce the length of the original packet */
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+	skb_trim(skb, pos);
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+
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 	skb2->priority = skb->priority;
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 	return skb_to_pkt(skb2);
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 }