1 // SPDX-License-Identifier: GPL-2.0 1
2 #include <linux/crash_dump.h>
3 #include <linux/io.h>
4 #include <linux/uio.h>
5
6 ssize_t copy_oldmem_page(struct iov_iter *iter
7 size_t csize, unsigne
8 {
9 void *vaddr;
10
11 if (!csize)
12 return 0;
13
14 vaddr = memremap(__pfn_to_phys(pfn), P
15 if (!vaddr)
16 return -ENOMEM;
17
18 csize = copy_to_iter(vaddr + offset, c
19
20 memunmap(vaddr);
21
22 return csize;
23 }
24
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