[PATCH] x86 e820: only void usable memory areas in memmap=exactmap case

[H. Peter Anvin]

On 01/11/2013 01:09 PM, Yinghai Lu wrote:
> On Fri, Jan 11, 2013 at 12:06 PM, H. Peter Anvin <hpa at zytor.com> wrote:
>> On 01/11/2013 11:59 AM, Yinghai Lu wrote:
>>> On Fri, Jan 11, 2013 at 10:24 AM, Thomas Renninger <trenn at suse.de> wrote:
>>>>> We may need to keep exactmap intact.
>>>> Why?
>>>> Kexec/kdump should have been the only user?
>>>> If older/current kexec calls still add ACPI maps via memmap=X#Y,
>>>> they should already exist in the original e820 map and fall off or
>>>> get glued to one region if (wrongly) overlapping via sanitize_map.
>>>
>>> No, kexec/kdump is not the only user for memmap=exactmap.
>>>
>>
>> Who is using it then, since you seem to know?
> 
> http://forums.gentoo.org/viewtopic-t-487476-highlight-proliant.html
> 
> http://forums.fedoraforum.org/archive/index.php/t-225347.html
> 

Hm... both of those seem to be someone trying memmap=exactmap to hack
around a problem which really was elsewhere, with a different solution.

	-hpa