x86, 64bit, mm: Make pgd next calculation consistent with pud/pmd

Just like the way we calculate next for pud and pmd, aka round down and
add size.

Also, do not do boundary-checking with 'next', and just pass 'end' down
to phys_pud_init() instead. Because the loop in phys_pud_init() stops at
PTRS_PER_PUD and thus can handle a possibly bigger 'end' properly.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-6-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 191ab12..d7af907 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -530,9 +530,7 @@ kernel_physical_mapping_init(unsigned long start,
                pgd_t *pgd = pgd_offset_k(start);
                pud_t *pud;
 
-               next = (start + PGDIR_SIZE) & PGDIR_MASK;
-               if (next > end)
-                       next = end;
+               next = (start & PGDIR_MASK) + PGDIR_SIZE;
 
                if (pgd_val(*pgd)) {
                        pud = (pud_t *)pgd_page_vaddr(*pgd);
@@ -542,7 +540,7 @@ kernel_physical_mapping_init(unsigned long start,
                }
 
                pud = alloc_low_page();
-               last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
+               last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
                                                 page_size_mask);
 
                spin_lock(&init_mm.page_table_lock);