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authorJan Beulich <jbeulich@novell.com>2007-05-02 19:27:10 +0200
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 19:27:10 +0200
commitd01ad8dd56527be72947b4b9997bb2c05783c3ed (patch)
tree4bb9ad792fae974101d0baec755202eebc8181aa /arch/i386/mm
parent90a0a06aa81692028864c21f981905fda46b1208 (diff)
downloadlinux-d01ad8dd56527be72947b4b9997bb2c05783c3ed.tar.bz2
[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 <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/i386/mm')
-rw-r--r--arch/i386/mm/pageattr.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index 412ebbd8adb0..ea6b6d4a0a2a 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)--;