tile: fix tilegx vmalloc_sync_all BUG_ON

As specified, the test wasn't correct, and in any case it should
be a BUILD_BUG_ON.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index f7f99f90cbe0..6152819e555b 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -870,7 +870,8 @@ void vmalloc_sync_all(void)
 {
 #ifdef __tilegx__
         /* Currently all L1 kernel pmd's are static and shared. */
-        BUG_ON(pgd_index(VMALLOC_END) != pgd_index(VMALLOC_START));
+        BUILD_BUG_ON(pgd_index(VMALLOC_END - PAGE_SIZE) !=
+                     pgd_index(VMALLOC_START));
 #else
         /*
          * Note that races in the updates of insync and start aren't