diff options
Diffstat (limited to 'arch/arm64/mm/pageattr.c')
| -rw-r--r-- | arch/arm64/mm/pageattr.c | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index ca6d268e3313..6ea71387ee12 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -70,6 +70,13 @@ static int change_memory_common(unsigned long addr, int numpages, WARN_ON_ONCE(1); } + if (!IS_ENABLED(CONFIG_FORCE_PAGES)) { + if (start < MODULES_VADDR || start >= MODULES_END) + return -EINVAL; + + if (end < MODULES_VADDR || end >= MODULES_END) + return -EINVAL; + } /* * Kernel VA mappings are always live, and splitting live section * mappings into page mappings may cause TLB conflicts. This means @@ -139,4 +146,43 @@ void __kernel_map_pages(struct page *page, int numpages, int enable) __pgprot(0), __pgprot(PTE_VALID)); } -#endif +#ifdef CONFIG_HIBERNATION +/* + * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function + * is used to determine if a linear map page has been marked as not-valid by + * CONFIG_DEBUG_PAGEALLOC. Walk the page table and check the PTE_VALID bit. + * This is based on kern_addr_valid(), which almost does what we need. + * + * Because this is only called on the kernel linear map, p?d_sect() implies + * p?d_present(). When debug_pagealloc is enabled, sections mappings are + * disabled. + */ +bool kernel_page_present(struct page *page) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + unsigned long addr = (unsigned long)page_address(page); + + pgd = pgd_offset_k(addr); + if (pgd_none(*pgd)) + return false; + + pud = pud_offset(pgd, addr); + if (pud_none(*pud)) + return false; + if (pud_sect(*pud)) + return true; + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + return false; + if (pmd_sect(*pmd)) + return true; + + pte = pte_offset_kernel(pmd, addr); + return pte_valid(*pte); +} +#endif /* CONFIG_HIBERNATION */ +#endif /* CONFIG_DEBUG_PAGEALLOC */ |