lkml.org 
[lkml]   [2013]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: mm: BUG in do_huge_pmd_wp_page
On 04/24/2013 04:40 PM, Simon Jeons wrote:
>
> I see in memblock_trim_memory(): start = round_up(orig_start, align);
> here align is PAGE_SIZE, so the dump of zone ranges in my machine is [
> 0.000000] DMA [mem 0x00001000-0x00ffffff]. Why PFN 0 is not
> used? just for align?
>

PFN 0 contains the real-mode interrupt vector table and BIOS data area,
so we just reserve it. Avoids issues with zero being special, too.

-hpa




\
 
 \ /
  Last update: 2013-04-26 04:41    [W:0.644 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site