VisionFive2 Linux kernel

d2912cb15bdda (Thomas Gleixner    2019-06-04 10:11:33 +0200  1) // SPDX-License-Identifier: GPL-2.0-only
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  2) /*
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  3)  * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  4)  */
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  5) 
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  6) #include <linux/uaccess.h>
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  7) #include <linux/kernel.h>
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  8) #include <os.h>
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200  9) 
fe557319aa06c (Christoph Hellwig  2020-06-17 09:37:53 +0200 10) bool copy_from_kernel_nofault_allowed(const void *src, size_t size)
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 11) {
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 12) 	void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 13) 
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 14) 	if ((unsigned long)src < PAGE_SIZE || size <= 0)
eab0c6089b689 (Christoph Hellwig  2020-06-08 21:34:27 -0700 15) 		return false;
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 16) 	if (os_mincore(psrc, size + src - psrc) <= 0)
eab0c6089b689 (Christoph Hellwig  2020-06-08 21:34:27 -0700 17) 		return false;
eab0c6089b689 (Christoph Hellwig  2020-06-08 21:34:27 -0700 18) 	return true;
f75b1b1bedfb4 (Richard Weinberger 2013-08-17 18:46:00 +0200 19) }