x86_64/setup: unconditionally populate the pgd

When allocating a new pud, unconditionally populate the pgd (why did
we bother to create a new pud if we weren't going to populate it?).

This will only happen if the pgd slot was empty, since any existing
pud will be reused.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b10b7f17ea58..77d129d62c97 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -616,9 +616,8 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned lon
 
                 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
                 unmap_low_page(pud);
-                if (!after_bootmem)
-                        pgd_populate(&init_mm, pgd_offset_k(start),
-                                     __va(pud_phys));
+                pgd_populate(&init_mm, pgd_offset_k(start),
+                             __va(pud_phys));
         }
 
         if (!after_bootmem)