LXR linux/arch/powerpc/lib/checksum

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * Copyright (C) IBM Corporation, 2010
   5 *
   6 * Author: Anton Blanchard <anton@au.ibm.com>
   7 */
   8#include <linux/export.h>
   9#include <linux/compiler.h>
  10#include <linux/types.h>
  11#include <asm/checksum.h>
  12#include <linux/uaccess.h>
  13
  14__wsum csum_and_copy_from_user(const void __user *src, void *dst,
  15                               int len)
  16{
  17        __wsum csum;
  18
  19        if (unlikely(!user_read_access_begin(src, len)))
  20                return 0;
  21
  22        csum = csum_partial_copy_generic((void __force *)src, dst, len);
  23
  24        user_read_access_end();
  25        return csum;
  26}
  27
  28__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
  29{
  30        __wsum csum;
  31
  32        if (unlikely(!user_write_access_begin(dst, len)))
  33                return 0;
  34
  35        csum = csum_partial_copy_generic(src, (void __force *)dst, len);
  36
  37        user_write_access_end();
  38        return csum;
  39}
  40