tree e8e3552748259a0e0818a2050f7e6e5ce5a02811
parent 65b1859e853d1ec2c2b0caf7ae60891efa0c51a4
author chunlin <chunlin.han@acer.com> 1495710380 +0800
committer Anas Nashif <nashif@linux.intel.com> 1496855832 -0400

arm: core: mpu: Prevent updating unexpected region

The REGION bits (bit[3:0]) of MPU_RBAR register can specify the number
of the region to update if the VALID bit (bit[4]) is also set.

If the bit[3:0] of "region_addr" are not zero, might cause to update
unexpected region. This could happen since we might not declare stack
memory with specific alignment.

This patch will mask the bit[4:0] of "region_addr" to prevent updating
unexpected region.

Signed-off-by: Chunlin Han <chunlin.han@linaro.org>