[SPARC64]: Fix build failure when CONFIG_BUG is disabled.

When CONFIG_BUG is turned off, the standard trick of:

	switch (x) {
	case X:
	...
	case Y:
	...
	default:
		BUG();
	};

to mark impossible cases does not work because BUG() evalutes
to nothing and thus GCC just sees a fallthrough code path.

Add an explicit KERN_ERR log message and a do_exit() to trap
this case.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 7ff0a02f5813..a3e6e4b635b3 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -182,7 +182,9 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_idx, unsign
                 break;
 
         default:
-                BUG();
+                printk(KERN_ERR "TSB[%s:%d]: Impossible TSB size %lu, killing process.\n",
+                       current->comm, current->pid, tsb_bytes);
+                do_exit(SIGSEGV);
         };
         tte |= pte_sz_bits(page_sz);