powerpc/lib/checksum_wrappers.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *
0004  * Copyright (C) IBM Corporation, 2010
0005  *
0006  * Author: Anton Blanchard <anton@au.ibm.com>
0007  */
0008 #include <linux/export.h>
0009 #include <linux/compiler.h>
0010 #include <linux/types.h>
0011 #include <asm/checksum.h>
0012 #include <linux/uaccess.h>
0013
0014 __wsum csum_and_copy_from_user(const void __user *src, void *dst,
0015                    int len)
0016 {
0017     __wsum csum;
0018
0019     if (unlikely(!user_read_access_begin(src, len)))
0020         return 0;
0021
0022     csum = csum_partial_copy_generic((void __force *)src, dst, len);
0023
0024     user_read_access_end();
0025     return csum;
0026 }
0027
0028 __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
0029 {
0030     __wsum csum;
0031
0032     if (unlikely(!user_write_access_begin(dst, len)))
0033         return 0;
0034
0035     csum = csum_partial_copy_generic(src, (void __force *)dst, len);
0036
0037     user_write_access_end();
0038     return csum;
0039 }