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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/sparc/include/asm/checksum_32.h
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@@ -42,7 +42,7 @@
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 unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
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 static inline __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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 	register unsigned int ret asm("o0") = (unsigned int)src;
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 	register char *d asm("o1") = dst;
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@@ -50,9 +50,9 @@
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 	__asm__ __volatile__ (
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 		"call __csum_partial_copy_sparc_generic\n\t"
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-		" mov %6, %%g7\n"
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+		" mov -1, %%g7\n"
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 	: "=&r" (ret), "=&r" (d), "=&r" (l)
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-	: "0" (ret), "1" (d), "2" (l), "r" (sum)
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+	: "0" (ret), "1" (d), "2" (l)
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 	: "o2", "o3", "o4", "o5", "o7",
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 	  "g2", "g3", "g4", "g5", "g7",
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 	  "memory", "cc");
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@@ -60,61 +60,20 @@
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 }
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 static inline __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 *err)
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-  {
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-	register unsigned long ret asm("o0") = (unsigned long)src;
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-	register char *d asm("o1") = dst;
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-	register int l asm("g1") = len;
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-	register __wsum s asm("g7") = sum;
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-
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-	__asm__ __volatile__ (
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-	".section __ex_table,#alloc\n\t"
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-	".align 4\n\t"
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-	".word 1f,2\n\t"
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-	".previous\n"
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-	"1:\n\t"
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-	"call __csum_partial_copy_sparc_generic\n\t"
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-	" st %8, [%%sp + 64]\n"
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-	: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
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-	: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
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-	: "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
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-	  "cc", "memory");
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-	return (__force __wsum)ret;
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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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+	if (unlikely(!access_ok(src, len)))
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+		return 0;
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+	return csum_partial_copy_nocheck((__force void *)src, dst, len);
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 }
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 static inline __wsum
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-csum_partial_copy_to_user(const void *src, void __user *dst, int len,
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-			  __wsum sum, int *err)
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+csum_and_copy_to_user(const void *src, void __user *dst, int len)
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 {
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-	if (!access_ok (VERIFY_WRITE, dst, len)) {
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-		*err = -EFAULT;
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-		return sum;
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-	} else {
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-		register unsigned long ret asm("o0") = (unsigned long)src;
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-		register char __user *d asm("o1") = dst;
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-		register int l asm("g1") = len;
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-		register __wsum s asm("g7") = sum;
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-
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-		__asm__ __volatile__ (
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-		".section __ex_table,#alloc\n\t"
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-		".align 4\n\t"
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-		".word 1f,1\n\t"
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-		".previous\n"
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-		"1:\n\t"
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-		"call __csum_partial_copy_sparc_generic\n\t"
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-		" st %8, [%%sp + 64]\n"
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-		: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
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-		: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
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-		: "o2", "o3", "o4", "o5", "o7",
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-		  "g2", "g3", "g4", "g5",
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-		  "cc", "memory");
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-		return (__force __wsum)ret;
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-	}
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+	if (!access_ok(dst, len))
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+		return 0;
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+	return csum_partial_copy_nocheck(src, (__force void *)dst, len);
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 }
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-
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-#define HAVE_CSUM_COPY_USER
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-#define csum_and_copy_to_user csum_partial_copy_to_user
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 /* ihl is always 5 or greater, almost always is 5, and iph is word aligned
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  * the majority of the time.