Blackfin: make sure MPU CPLB for first 1k is marked as valid

This way we properly catch and kill applications that jump to a NULL ptr.
Signed-off-by: NRobin Getz <robin.getz@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

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

@@ -64,7 +64,7 @@ void __init generate_cplb_tables_cpu(unsigned int cpu)
 	dcplb_tbl[cpu][i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
 
 	icplb_tbl[cpu][i_i].addr = 0;
-	icplb_tbl[cpu][i_i++].data = i_cache | CPLB_USER_RD | PAGE_SIZE_1KB;
+	icplb_tbl[cpu][i_i++].data = CPLB_VALID | i_cache | CPLB_USER_RD | PAGE_SIZE_1KB;
 
 	/* Cover kernel memory with 4M pages.  */
 	addr = 0;