• Aneesh Kumar K.V's avatar
    powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit · da7ad366
    Aneesh Kumar K.V authored
    With this patch we use 0x8000000000000000UL (_PAGE_PRESENT) to indicate a valid
    pgd/pud/pmd entry. We also switch the p**_present() to look at this bit.
    
    With pmd_present, we have a special case. We need to make sure we consider a
    pmd marked invalid during THP split as present. Right now we clear the
    _PAGE_PRESENT bit during a pmdp_invalidate. Inorder to consider this special
    case we add a new pte bit _PAGE_INVALID (mapped to _RPAGE_SW0). This bit is
    only used with _PAGE_PRESENT cleared. Hence we are not really losing a pte bit
    for this special case. pmd_present is also updated to look at _PAGE_INVALID.
    Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    da7ad366
pgtable.h 37.2 KB