net: unexport csum_and_copy_{from,to}_user

csum_and_copy_from_user and csum_and_copy_to_user are exported by a few
architectures, but not actually used in modular code.  Drop the exports.

Link: https://lkml.kernel.org/r/20220421070440.1282704-1-hch@lst.deSigned-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NJakub Kicinski <kuba@kernel.org>
Acked-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: David Miller <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>

arch/alpha/lib/csum_partial_copy.c

@@ -353,7 +353,6 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len)
 		return 0;
 	return __csum_and_copy(src, dst, len);
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 __wsum
 csum_partial_copy_nocheck(const void *src, void *dst, int len)

arch/m68k/lib/checksum.c

@@ -265,8 +265,6 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len)
 	return sum;
 }
 
-EXPORT_SYMBOL(csum_and_copy_from_user);
-
 
 /*
  * copy from kernel space while checksumming, otherwise like csum_partial

arch/powerpc/lib/checksum_wrappers.c

@@ -24,7 +24,6 @@ __wsum csum_and_copy_from_user(const void __user *src, void *dst,
 	user_read_access_end();
 	return csum;
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
 {
@@ -38,4 +37,3 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
 	user_write_access_end();
 	return csum;
 }
-EXPORT_SYMBOL(csum_and_copy_to_user);

arch/x86/lib/csum-wrappers_64.c

@@ -32,7 +32,6 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len)
 	user_access_end();
 	return sum;
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 /**
  * csum_and_copy_to_user - Copy and checksum to user space.
@@ -57,7 +56,6 @@ csum_and_copy_to_user(const void *src, void __user *dst, int len)
 	user_access_end();
 	return sum;
 }
-EXPORT_SYMBOL(csum_and_copy_to_user);
 
 /**
  * csum_partial_copy_nocheck - Copy and checksum.