[PATCH] x86/mm: do not BUG_ON() on stall pgd entries

["Jérôme Glisse" <jglisse@redhat.com>]

Since af2cf278ef4f ("Don't remove PGD entries in remove_pagetable()")
we no longer cleanup stall pgd entries and thus the BUG_ON() inside
sync_global_pgds() is wrong.

This patch remove the BUG_ON() and unconditionaly update stall pgd
entries.

Signed-off-by: JA(C)rA'me Glisse <jglisse@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/x86/mm/init_64.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ff95fe8..36b9020 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -123,12 +123,7 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 			pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 			spin_lock(pgt_lock);
 
-			if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
-				BUG_ON(p4d_page_vaddr(*p4d)
-				       != p4d_page_vaddr(*p4d_ref));
-
-			if (p4d_none(*p4d))
-				set_p4d(p4d, *p4d_ref);
+			set_p4d(p4d, *p4d_ref);
 
 			spin_unlock(pgt_lock);
 		}
-- 
2.9.4

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