Blackfin arch: add BUG_ON() checks to make sure we dont overflow the cplb tables

Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/cplb-nompu/cplbinit.c

@@ -420,8 +420,17 @@ void __init generate_cplb_tables_cpu(unsigned int cpu)
 		}
 	}
 
-	/* close tables */
+	/* make sure we locked the kernel start */
+	BUG_ON(cplb.init_i.pos < 2 + cplb_data[ZERO_P].valid);
+	BUG_ON(cplb.init_d.pos < 1 + cplb_data[ZERO_P].valid + cplb_data[L1D_MEM].valid);
+
+	/* make sure we didnt overflow the table */
+	BUG_ON(cplb.init_i.size <= cplb.init_i.pos);
+	BUG_ON(cplb.init_d.size <= cplb.init_d.pos);
+	BUG_ON(cplb.switch_i.size <= cplb.switch_i.pos);
+	BUG_ON(cplb.switch_d.size <= cplb.switch_d.pos);
 
+	/* close tables */
 	close_cplbtab(&cplb.init_i);
 	close_cplbtab(&cplb.init_d);