diff options
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index e2a74ea..464d8fc 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -899,7 +899,24 @@ void kernel_map_pages(struct page *page, int numpages, int enable) */ cpa_fill_pool(); } -#endif + +#ifdef CONFIG_HIBERNATION + +bool kernel_page_present(struct page *page) +{ + unsigned int level; + pte_t *pte; + + if (PageHighMem(page)) + return false; + + pte = lookup_address((unsigned long)page_address(page), &level); + return (pte_val(*pte) & _PAGE_PRESENT); +} + +#endif /* CONFIG_HIBERNATION */ + +#endif /* CONFIG_DEBUG_PAGEALLOC */ /* * The testcases use internal knowledge of the implementation that shouldn't |