1 files changed, 10 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index a03c2dfff4a3..1a942a721d51 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -238,7 +238,12 @@ void __init setup_arch(char **cmdline_p)
         memory_end = _ramend - DMA_UNCACHED_REGION;
 
         _ramstart = (unsigned long)__bss_stop;
+#ifdef CONFIG_MPU
+        /* Round up to multiple of 4MB.  */
+        memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
+#else
         memory_start = PAGE_ALIGN(_ramstart);
+#endif
 
 #if defined(CONFIG_MTD_UCLINUX)
         /* generic memory mapped MTD driver */
@@ -307,6 +312,11 @@ void __init setup_arch(char **cmdline_p)
         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 #endif                          /* ANOMALY_05000263 */
 
+#ifdef CONFIG_MPU
+        page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
+        page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
+#endif
+
 #if !defined(CONFIG_MTD_UCLINUX)
         memory_end -= SIZE_4K; /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 #endif