1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/highmem.h> 3 #include <linux/crash_dump.h> 4 #include <linux/uio.h> 5 6 ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, 7 size_t csize, unsigned long offset) 8 { 9 void *vaddr; 10 11 if (!csize) 12 return 0; 13 14 vaddr = kmap_local_pfn(pfn); 15 csize = copy_to_iter(vaddr + offset, csize, iter); 16 kunmap_local(vaddr); 17 18 return csize; 19 } 20