lkml.org 
[lkml]   [2018]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 3/3] x86/mm: disable ioremap free page handling on x86-PAE
Date
On Mon, 2018-04-30 at 11:59 -0600, Toshi Kani wrote:
> ioremap() supports pmd mappings on x86-PAE. However, kernel's pmd
> tables are not shared among processes on x86-PAE. Therefore, any
> update to sync'd pmd entries need re-syncing. Freeing a pte page
> also leads to a vmalloc fault and hits the BUG_ON in vmalloc_sync_one().
>
> Disable free page handling on x86-PAE. pud_free_pmd_page() and
> pmd_free_pte_page() simply return 0 if a given pud/pmd entry is present.
> This assures that ioremap() does not update sync'd pmd entries at the
> cost of falling back to pte mappings.
>
> Fixes: 28ee90fe6048 ("x86/mm: implement free pmd/pte page interfaces")
> Reported-by: Joerg Roedel <joro@8bytes.org>

Hi Joerg,

Does it solve your problem? Let me know if you have any issue with the
series.

Thanks,
-Toshi
\
 
 \ /
  Last update: 2018-05-09 17:48    [W:0.084 / U:2.864 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site