Release 4.14 arch/x86/kernel/crash_dump_64.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/errno.h>
#include <linux/crash_dump.h>
#include <linux/uaccess.h>
#include <linux/io.h>
/**
* copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied
* @buf: target memory address for the copy; this can be in kernel address
* space or user address space (see @userbuf)
* @csize: number of bytes to copy
* @offset: offset in bytes into the page (based on pfn) to begin the copy
* @userbuf: if set, @buf is in user address space, use copy_to_user(),
* otherwise @buf is in kernel address space, use memcpy().
*
* Copy a page from "oldmem". For this page, there is no pte mapped
* in the current kernel. We stitch up a pte, similar to kmap_atomic.
*/
ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
size_t csize, unsigned long offset, int userbuf)
{
void *vaddr;
if (!csize)
return 0;
vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
if (userbuf) {
if (copy_to_user(buf, vaddr + offset, csize)) {
iounmap(vaddr);
return -EFAULT;
}
} else
memcpy(buf, vaddr + offset, csize);
set_iounmap_nonlazy();
iounmap(vaddr);
return csize;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 95 | 87.96% | 2 | 40.00% |
| Akinobu Mita | 9 | 8.33% | 1 | 20.00% |
| Cliff Wickman | 4 | 3.70% | 2 | 40.00% |
| Total | 108 | 100.00% | 5 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vivek Goyal | 103 | 83.74% | 2 | 20.00% |
| Akinobu Mita | 9 | 7.32% | 1 | 10.00% |
| Cliff Wickman | 4 | 3.25% | 2 | 20.00% |
| Gustavo Fernando Padovan | 2 | 1.63% | 1 | 10.00% |
| Michael Ellerman | 2 | 1.63% | 1 | 10.00% |
| Greg Kroah-Hartman | 1 | 0.81% | 1 | 10.00% |
| Randy Dunlap | 1 | 0.81% | 1 | 10.00% |
| Dave Jones | 1 | 0.81% | 1 | 10.00% |
| Total | 123 | 100.00% | 10 | 100.00% |
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