lkml.org 
[lkml]   [2010]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Patch 1/1] x86 efi: Fill all reserved memmap entries if add_efi_memmap specified.
On 05/12/2010 11:55 AM, H. Peter Anvin wrote:
> On 05/12/2010 11:10 AM, Mike Travis wrote:
>>
>> Currently, the e820_reserve_resources() function does not add entries
>> obtained via the "add_efi_memmap" kernel cmdline option. This causes
>> /sys/firmware/memmap/... to be incomplete (stops after 128 entries).
>> Utilities that examine these entries then do not get the complete
>> picture of system memory.
>>
>> This patch causes the above function to use the e820 memmap instead
>> of the e820_saved memmap if "add_efi_memmap" cmdline option is
>> specified.
>>
>> Signed-off-by: Mike Travis <travis@sgi.com>
>> Signed-off-by: Jack Steiner <steiner@sgi.com>
>
> If I'm not mistaken, the very reason for the e820 vs e820_saved map is
> that the latter is supposed to reflect the firmware report, whereas the
> former is subject to be modified by the kernel. As this is actually a
> reflection of the firmware (although it would be better if you could fix
> the bootloader instead of adding hacks in the kernel...) it really
> should go into e820_saved as well as e820. Displaying the adjusted e820
> map doesn't seem appropriate under any circumstances.

Yes, you are right.

We should not touch e820_saved and keep /sys/firmware/memmap to be consistent with it.

YH


\
 
 \ /
  Last update: 2010-05-12 22:23    [W:3.063 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site