root/arch/c6x/lib/checksum.c

DEFINITIONS

1. csum_partial_copy_from_user

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4 #include <linux/module.h>
   5 #include <net/checksum.h>
   6 
   7 #include <asm/byteorder.h>
   8 
   9 /*
  10  * copy from fs while checksumming, otherwise like csum_partial
  11  */
  12 __wsum
  13 csum_partial_copy_from_user(const void __user *src, void *dst, int len,
  14                             __wsum sum, int *csum_err)
  15 {
  16         int missing;
  17 
  18         missing = __copy_from_user(dst, src, len);
  19         if (missing) {
  20                 memset(dst + len - missing, 0, missing);
  21                 *csum_err = -EFAULT;
  22         } else
  23                 *csum_err = 0;
  24 
  25         return csum_partial(dst, len, sum);
  26 }
  27 EXPORT_SYMBOL(csum_partial_copy_from_user);
  28 
  29 /* These are from csum_64plus.S */
  30 EXPORT_SYMBOL(csum_partial);
  31 EXPORT_SYMBOL(csum_partial_copy);
  32 EXPORT_SYMBOL(ip_compute_csum);
  33 EXPORT_SYMBOL(ip_fast_csum);