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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/m68k/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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  * INET		An implementation of the TCP/IP protocol suite for the LINUX
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  *		operating system.  INET is implemented using the  BSD Socket
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@@ -21,11 +22,6 @@
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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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  * 1998/8/31	Andreas Schwab:
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  *		Zero out rest of buffer on exception in
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@@ -133,8 +129,7 @@
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  */
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 __wsum
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-csum_partial_copy_from_user(const void __user *src, void *dst,
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-			    int len, __wsum sum, int *csum_err)
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+csum_and_copy_from_user(const void __user *src, void *dst, int len)
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 {
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 	/*
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 	 * GCC doesn't like more than 10 operands for the asm
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@@ -142,6 +137,7 @@
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 	 * code.
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 	 */
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 	unsigned long tmp1, tmp2;
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+	__wsum sum = ~0U;
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 	__asm__("movel %2,%4\n\t"
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 		"btst #1,%4\n\t"	/* Check alignment */
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@@ -240,87 +236,36 @@
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 		"clrl %5\n\t"
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 		"addxl %5,%0\n\t"	/* add X bit */
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 	     "7:\t"
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-		"clrl %5\n"		/* no error - clear return value */
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-	     "8:\n"
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 		".section .fixup,\"ax\"\n"
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 		".even\n"
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-		/* If any exception occurs zero out the rest.
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-		   Similarities with the code above are intentional :-) */
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+		/* If any exception occurs, return 0 */
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 	     "90:\t"
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-		"clrw %3@+\n\t"
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-		"movel %1,%4\n\t"
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-		"lsrl #5,%1\n\t"
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-		"jeq 1f\n\t"
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-		"subql #1,%1\n"
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-	     "91:\t"
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-		"clrl %3@+\n"
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-	     "92:\t"
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-		"clrl %3@+\n"
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-	     "93:\t"
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-		"clrl %3@+\n"
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-	     "94:\t"
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-		"clrl %3@+\n"
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-	     "95:\t"
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-		"clrl %3@+\n"
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-	     "96:\t"
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-		"clrl %3@+\n"
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-	     "97:\t"
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-		"clrl %3@+\n"
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-	     "98:\t"
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-		"clrl %3@+\n\t"
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-		"dbra %1,91b\n\t"
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-		"clrw %1\n\t"
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-		"subql #1,%1\n\t"
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-		"jcc 91b\n"
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-	     "1:\t"
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-		"movel %4,%1\n\t"
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-		"andw #0x1c,%4\n\t"
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-		"jeq 1f\n\t"
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-		"lsrw #2,%4\n\t"
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-		"subqw #1,%4\n"
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-	     "99:\t"
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-		"clrl %3@+\n\t"
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-		"dbra %4,99b\n\t"
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-	     "1:\t"
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-		"andw #3,%1\n\t"
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-		"jeq 9f\n"
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-	     "100:\t"
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-		"clrw %3@+\n\t"
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-		"tstw %1\n\t"
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-		"jeq 9f\n"
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-	     "101:\t"
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-		"clrb %3@+\n"
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-	     "9:\t"
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-#define STR(X) STR1(X)
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-#define STR1(X) #X
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-		"moveq #-" STR(EFAULT) ",%5\n\t"
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-		"jra 8b\n"
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+		"clrl %0\n"
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+		"jra 7b\n"
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 		".previous\n"
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 		".section __ex_table,\"a\"\n"
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 		".long 10b,90b\n"
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-		".long 11b,91b\n"
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-		".long 12b,92b\n"
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-		".long 13b,93b\n"
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-		".long 14b,94b\n"
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-		".long 15b,95b\n"
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-		".long 16b,96b\n"
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-		".long 17b,97b\n"
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-		".long 18b,98b\n"
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-		".long 19b,99b\n"
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-		".long 20b,100b\n"
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-		".long 21b,101b\n"
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+		".long 11b,90b\n"
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+		".long 12b,90b\n"
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+		".long 13b,90b\n"
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+		".long 14b,90b\n"
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+		".long 15b,90b\n"
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+		".long 16b,90b\n"
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+		".long 17b,90b\n"
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+		".long 18b,90b\n"
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+		".long 19b,90b\n"
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+		".long 20b,90b\n"
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+		".long 21b,90b\n"
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 		".previous"
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 		: "=d" (sum), "=d" (len), "=a" (src), "=a" (dst),
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 		  "=&d" (tmp1), "=d" (tmp2)
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 		: "0" (sum), "1" (len), "2" (src), "3" (dst)
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 	    );
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-	*csum_err = tmp2;
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-
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-	return(sum);
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+	return sum;
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 }
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-EXPORT_SYMBOL(csum_partial_copy_from_user);
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+EXPORT_SYMBOL(csum_and_copy_from_user);
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 /*
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@@ -328,9 +273,10 @@
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  */
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 __wsum
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-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
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+csum_partial_copy_nocheck(const void *src, void *dst, int len)
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 {
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 	unsigned long tmp1, tmp2;
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+	__wsum sum = 0;
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 	__asm__("movel %2,%4\n\t"
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 		"btst #1,%4\n\t"	/* Check alignment */
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 		"jeq 2f\n\t"