Old stuff in patch:

     pgd_p = pgd_offset(mm, pte_linear);
-    pmd_p = pmd_offset(pgd_p, pte_linear);
+    pud_p = pud_offset(pgd_p, pte_linear);
+    pmd_p = pmd_offset(pud_p, pte_linear);

New stuff in firegl_public.c

    PGD_OFFSET(mm, pgd_p, pte_linear); 
    PGD_PRESENT(pgd_p);
    PMD_OFFSET(pmd_p, pgd_p, pte_linear);
    PMD_PRESENT(pmd_p);