commit 2da06af8106f8f35318bb084baf8448797ef058a
author zhenzhong.duan <zhenzhong.duan@oracle.com> Wed May 30 12:52:15 2012 +0800
committer H. Peter Anvin <hpa@zytor.com> Wed May 30 14:37:00 2012 -0700
tree 8bf4749904065ce3cecf56dcd9545340a61a926d
parent bbd771474ec44b516107685d77e1c80bbe09f141

x86, mtrr: Fix a type overflow in range_to_mtrr func

When boot on sun G5+ with 4T mem, see an overflow in mtrr cleanup as below.

*BAD*gran_size: 2G      chunk_size: 2G  num_reg: 10     lose cover RAM:
-18014398505283592M

This is because 1<<31 sign extended. Use an unsigned long constant to
fix it.  Useful for mem larger than or equal to 4T.

-v2: Use 64bit constant instead of explicit type conversion as suggested
by Yinghai. Description updated too.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Link: http://lkml.kernel.org/r/4FC5A77F.6060505@oracle.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>