https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c authored by Linus Torvalds on 27 August 2023, 21:49:51 UTC
Linux 6.5
Linux 6.5
Tip revision: 2dde18c
crash_dump_32.c
// SPDX-License-Identifier: GPL-2.0
/*
* Memory preserving reboot related code.
*
* Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
* Copyright (C) IBM Corporation, 2004. All rights reserved
*/
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/highmem.h>
#include <linux/crash_dump.h>
#include <linux/uio.h>
static inline bool is_crashed_pfn_valid(unsigned long pfn)
{
#ifndef CONFIG_X86_PAE
/*
* non-PAE kdump kernel executed from a PAE one will crop high pte
* bits and poke unwanted space counting again from address 0, we
* don't want that. pte must fit into unsigned long. In fact the
* test checks high 12 bits for being zero (pfn will be shifted left
* by PAGE_SHIFT).
*/
return pte_pfn(pfn_pte(pfn, __pgprot(0))) == pfn;
#else
return true;
#endif
}
ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
unsigned long offset)
{
void *vaddr;
if (!csize)
return 0;
if (!is_crashed_pfn_valid(pfn))
return -EFAULT;
vaddr = kmap_local_pfn(pfn);
csize = copy_to_iter(vaddr + offset, csize, iter);
kunmap_local(vaddr);
return csize;
}