1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2008
4 *
5 * Guest page hinting for unused pages.
6 *
7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 */
9
10 #include <linux/mm.h>
11 #include <asm/page-states.h>
12 #include <asm/sections.h>
13 #include <asm/page.h>
14
15 int __bootdata_preserved(cmma_flag);
16
17 void arch_free_page(struct page *page, int order)
18 {
19 if (!cmma_flag)
20 return;
21 __set_page_unused(page_to_virt(page), 1UL << order);
22 }
23
24 void arch_alloc_page(struct page *page, int order)
25 {
26 if (!cmma_flag)
27 return;
28 if (cmma_flag < 2)
29 __set_page_stable_dat(page_to_virt(page), 1UL << order);
30 else
31 __set_page_stable_nodat(page_to_virt(page), 1UL << order);
32 }
33
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