LXR linux/arch/um/kernel/maccess.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
   4 */
   5
   6#include <linux/uaccess.h>
   7#include <linux/kernel.h>
   8#include <os.h>
   9
  10bool copy_from_kernel_nofault_allowed(const void *src, size_t size)
  11{
  12        void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
  13
  14        if ((unsigned long)src < PAGE_SIZE || size <= 0)
  15                return false;
  16        if (os_mincore(psrc, size + src - psrc) <= 0)
  17                return false;
  18        return true;
  19}
  20