diff options
| -rw-r--r-- | arch/i386/mm/pageattr.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c index d0cadb3..92c3d9f 100644 --- a/arch/i386/mm/pageattr.c +++ b/arch/i386/mm/pageattr.c @@ -51,6 +51,13 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot, if (!base) return NULL; + /* + * page_private is used to track the number of entries in + * the page table page that have non standard attributes. + */ + SetPagePrivate(base); + page_private(base) = 0; + address = __pa(address); addr = address & LARGE_PAGE_MASK; pbase = (pte_t *)page_address(base); @@ -143,11 +150,12 @@ __change_page_attr(struct page *page, pgprot_t prot) return -ENOMEM; set_pmd_pte(kpte,address,mk_pte(split, ref_prot)); kpte_page = split; - } - get_page(kpte_page); + } + page_private(kpte_page)++; } else if ((pte_val(*kpte) & _PAGE_PSE) == 0) { set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL)); - __put_page(kpte_page); + BUG_ON(page_private(kpte_page) == 0); + page_private(kpte_page)--; } else BUG(); @@ -157,10 +165,8 @@ __change_page_attr(struct page *page, pgprot_t prot) * replace it with a largepage. */ if (!PageReserved(kpte_page)) { - /* memleak and potential failed 2M page regeneration */ - BUG_ON(!page_count(kpte_page)); - - if (cpu_has_pse && (page_count(kpte_page) == 1)) { + if (cpu_has_pse && (page_private(kpte_page) == 0)) { + ClearPagePrivate(kpte_page); list_add(&kpte_page->lru, &df_list); revert_page(kpte_page, address); } |