| 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 |