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    Subject[PATCH] [29/50] x86: honor _PAGE_PSE bit on page walks
    Date

    From: "Jan Beulich" <jbeulich@novell.com>
    Signed-off-by: Jan Beulich <jbeulich@novell.com>
    Signed-off-by: Andi Kleen <ak@suse.de>

    arch/i386/mm/fault.c | 3 ++-
    arch/x86_64/mm/fault.c | 2 +-
    2 files changed, 3 insertions(+), 2 deletions(-)

    Index: linux/arch/i386/mm/fault.c
    ===================================================================
    --- linux.orig/arch/i386/mm/fault.c
    +++ linux/arch/i386/mm/fault.c
    @@ -569,7 +569,8 @@ no_context:
    * it's allocated already.
    */
    if ((page >> PAGE_SHIFT) < max_low_pfn
    - && (page & _PAGE_PRESENT)) {
    + && (page & _PAGE_PRESENT)
    + && !(page & _PAGE_PSE)) {
    page &= PAGE_MASK;
    page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT)
    & (PTRS_PER_PTE - 1)];
    Index: linux/arch/x86_64/mm/fault.c
    ===================================================================
    --- linux.orig/arch/x86_64/mm/fault.c
    +++ linux/arch/x86_64/mm/fault.c
    @@ -175,7 +175,7 @@ void dump_pagetable(unsigned long addres
    pmd = pmd_offset(pud, address);
    if (bad_address(pmd)) goto bad;
    printk("PMD %lx ", pmd_val(*pmd));
    - if (!pmd_present(*pmd)) goto ret;
    + if (!pmd_present(*pmd) || pmd_large(*pmd)) goto ret;

    pte = pte_offset_kernel(pmd, address);
    if (bad_address(pte)) goto bad;
    -
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