lkml.org 
[lkml]   [2013]   [Nov]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: perf events ring buffer memory barrier on powerpc
From
Date
On Fri, 2013-11-01 at 18:30 +0200, Victor Kaplansky wrote:
> "David Laight" <David.Laight@aculab.com> wrote on 11/01/2013 06:25:29 PM:
> > gcc will do unexpected memory accesses for bit fields that are
> > adjacent to volatile data.
> > In particular it may generate 64bit sized (and aligned) RMW cycles
> > when accessing bit fields.
> > And yes, this has caused real problems.
>
> Thanks, I am aware about this bug/feature in gcc.

AFAIK, this has been fixed in 4.8 and 4.7.3 ...

Cheers,
Ben.

> -- Victor
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev




\
 
 \ /
  Last update: 2013-11-03 22:21    [W:0.120 / U:2.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site