28 lines
646 B
C
28 lines
646 B
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* kernel/crash_dump.c - Memory preserving reboot related code.
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*
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* Created by: Simon Horman <horms@verge.net.au>
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* Original code moved from kernel/crash.c
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* Original code comment copied from the i386 version of this file
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/crash_dump.h>
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#include <linux/uio.h>
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#include <asm/page.h>
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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if (!csize)
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return 0;
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vaddr = __va(pfn<<PAGE_SHIFT);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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return csize;
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}
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