tree 64479687a95b07bad97b886f1e97c3a391daf934
parent 8a4a6182fd43c46ed8c12e26b4669854bcad300a
author H. Peter Anvin <hpa@zytor.com> 1244596839 -0700
committer H. Peter Anvin <hpa@zytor.com> 1245199651 -0700

x86: cap iomem_resource to addressable physical memory

iomem_resource is by default initialized to -1, which means 64 bits of
physical address space if 64-bit resources are enabled.  However, x86
CPUs cannot address 64 bits of physical address space.  Thus, we want
to cap the physical address space to what the union of all CPU can
actually address.

Without this patch, we may end up assigning inaccessible values to
uninitialized 64-bit PCI memory resources.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Martin Mares <mj@ucw.cz>
Cc: stable@kernel.org