lkml.org 
[lkml]   [2006]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.19-rc2-mm1
Carsten Otte wrote:
> Andrew Morton wrote:
>
>> The page we're writing into isn't locked, so there's no deadlock afaict.
>>
>> But then, I forget how xip works. Carsten, is it actually being used for
>> anything?
>>
>
> The comment may be superfluous. I did not quite understand the deadlock
> condition refered to by the comment in filemap, therefore I cut&pasted
> it over. I will send a patch that removes it.

Yes, it wasn't a good comment. Basically we can't hold the page lock and
then enter the page fault handler. mm-fix-pagecache-write-deadlocks.patch
has quite a lot of comments to explain it.

I don't believe filemap_xip holds the page lock, so you don't need to do
the atomic copy, and you don't need to do the fault_in_pages_readable.

--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-19 20:13    [W:0.103 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site