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    SubjectRe: 2.6.13-rc3-mm3
    Could you try the following patch? I think the problem was that higher 
    addressses were not mappable via the page fault handler. This patch
    inserts the pmd entry into the pgd as necessary if the pud level is
    folded.

    Signed-off-by: Christoph Lameter <christoph@lameter.com>

    Index: linux-2.6.13-rc4/mm/memory.c
    ===================================================================
    --- linux-2.6.13-rc4.orig/mm/memory.c 2005-08-03 17:08:29.000000000 -0700
    +++ linux-2.6.13-rc4/mm/memory.c 2005-08-03 17:15:22.000000000 -0700
    @@ -2144,9 +2144,16 @@
    */
    page_table_atomic_start(mm);
    pgd = pgd_offset(mm, address);
    -#ifndef __PAGETABLE_PUD_FOLDED
    if (unlikely(pgd_none(*pgd))) {
    +#ifdef __PAGETABLE_PUD_FOLDED
    + /* If the pud is folded then we need to insert a pmd entry into
    + * a pgd. pud_none(pgd) == 0 so the next if statement will never
    + * be taken
    + */
    + pmd_t *new;
    +#else
    pud_t *new;
    +#endif

    page_table_atomic_stop(mm);
    new = pud_alloc_one(mm, address);
    @@ -2158,7 +2165,6 @@
    if (!pgd_test_and_populate(mm, pgd, new))
    pud_free(new);
    }
    -#endif

    pud = pud_offset(pgd, address);
    if (unlikely(pud_none(*pud))) {
    Index: linux-2.6.13-rc4/include/asm-generic/4level-fixup.h
    ===================================================================
    --- linux-2.6.13-rc4.orig/include/asm-generic/4level-fixup.h 2005-08-03 17:06:01.000000000 -0700
    +++ linux-2.6.13-rc4/include/asm-generic/4level-fixup.h 2005-08-03 17:09:38.000000000 -0700
    @@ -27,6 +27,7 @@
    #define pud_ERROR(pud) do { } while (0)
    #define pud_clear(pud) pgd_clear(pud)
    #define pud_populate pgd_populate
    +#define pud_alloc_one pmd_alloc_one

    #undef pud_free_tlb
    #define pud_free_tlb(tlb, x) do { } while (0)
    -
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