From d01ad8dd56527be72947b4b9997bb2c05783c3ed Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 2 May 2007 19:27:10 +0200 Subject: [PATCH] x86: Improve handling of kernel mappings in change_page_attr Fix various broken corner cases in i386 and x86-64 change_page_attr. AK: split off from tighten kernel image access rights Signed-off-by: Jan Beulich Signed-off-by: Andi Kleen --- arch/i386/mm/pageattr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/i386/mm') diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c index 412ebbd8adb..ea6b6d4a0a2 100644 --- a/arch/i386/mm/pageattr.c +++ b/arch/i386/mm/pageattr.c @@ -142,7 +142,7 @@ __change_page_attr(struct page *page, pgprot_t prot) return -EINVAL; kpte_page = virt_to_page(kpte); if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) { - if ((pte_val(*kpte) & _PAGE_PSE) == 0) { + if (!pte_huge(*kpte)) { set_pte_atomic(kpte, mk_pte(page, prot)); } else { pgprot_t ref_prot; @@ -158,7 +158,7 @@ __change_page_attr(struct page *page, pgprot_t prot) kpte_page = split; } page_private(kpte_page)++; - } else if ((pte_val(*kpte) & _PAGE_PSE) == 0) { + } else if (!pte_huge(*kpte)) { set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL)); BUG_ON(page_private(kpte_page) == 0); page_private(kpte_page)--; -- cgit v1.2.3