mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 22:03:17 +01:00
Christoph Hellwig
fe557319aa
Better describe what these functions do. Suggested-by: Linus Torvalds <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
20 lines
456 B
C
20 lines
456 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2013 Richard Weinberger <[email protected]>
|
|
*/
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <linux/kernel.h>
|
|
#include <os.h>
|
|
|
|
bool copy_from_kernel_nofault_allowed(const void *src, size_t size)
|
|
{
|
|
void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
|
|
|
|
if ((unsigned long)src < PAGE_SIZE || size <= 0)
|
|
return false;
|
|
if (os_mincore(psrc, size + src - psrc) <= 0)
|
|
return false;
|
|
return true;
|
|
}
|