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>

diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index f7f99f9..6152819 100644 (file)
--- 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