[PATCH] bogus BUILD_BUG_ON() in bpa_iommu

BUILD_BUG_ON(1) is asking for trouble (and getting it) when used in that
manner - dead code elimination happens after we parse it and invalid
type is invalid type, dead code or not.

It might be version-dependent, but at least 4.0.1 refuses to accept
that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/ppc64/kernel/bpa_iommu.c b/arch/ppc64/kernel/bpa_iommu.c
index f33a7bccb0d7..507eb9d0223f 100644
--- a/arch/ppc64/kernel/bpa_iommu.c
+++ b/arch/ppc64/kernel/bpa_iommu.c
@@ -99,7 +99,11 @@ get_iost_entry(unsigned long iopt_base, unsigned long io_address, unsigned page_
                 break;
 
         default: /* not a known compile time constant */
-                BUILD_BUG_ON(1);
+                {
+                        /* BUILD_BUG_ON() is not usable here */
+                        extern void __get_iost_entry_bad_page_size(void);
+                        __get_iost_entry_bad_page_size();
+                }
                 break;
         }