add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/lib/checksum.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *
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  * INET		An implementation of the TCP/IP protocol suite for the LINUX
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  *		data-registers to hold input values and one tries to
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  *		specify d0 and d1 as scratch registers. Letting gcc
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  *		choose these registers itself solves the problem.
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- *
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- *		This program is free software; you can redistribute it and/or
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- *		modify it under the terms of the GNU General Public License
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- *		as published by the Free Software Foundation; either version
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- *		2 of the License, or (at your option) any later version.
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  */
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 /* Revised by Kenneth Albanowski for m68knommu. Basic problem: unaligned access
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 	return (__force __sum16)~do_csum(buff, len);
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 }
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 EXPORT_SYMBOL(ip_compute_csum);
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-
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-/*
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- * copy from fs while checksumming, otherwise like csum_partial
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- */
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-__wsum
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-csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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-						__wsum sum, int *csum_err)
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-{
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-	int missing;
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-
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-	missing = __copy_from_user(dst, src, len);
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-	if (missing) {
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-		memset(dst + len - missing, 0, missing);
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-		*csum_err = -EFAULT;
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-	} else
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-		*csum_err = 0;
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-
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-	return csum_partial(dst, len, sum);
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-}
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-EXPORT_SYMBOL(csum_partial_copy_from_user);
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-
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-/*
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- * copy from ds while checksumming, otherwise like csum_partial
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- */
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-__wsum
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-csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
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-{
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-	memcpy(dst, src, len);
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-	return csum_partial(dst, len, sum);
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-}
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-EXPORT_SYMBOL(csum_partial_copy);
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 #ifndef csum_tcpudp_nofold
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 static inline u32 from64to32(u64 x)