lkml.org 
[lkml]   [2019]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 20/20] objtool: Add Direction Flag validation
On Fri, Mar 08, 2019 at 03:56:02PM -0600, Josh Poimboeuf wrote:
> On Fri, Mar 08, 2019 at 10:33:43PM +0100, Peter Zijlstra wrote:
> > On Fri, Mar 08, 2019 at 03:16:03PM -0600, Josh Poimboeuf wrote:

> > > Can you elaborate on why (in the patch description)? Did this actually
> > > find any occurrences?
> >
> > Nope, didn't find anything. Also, all DF users are in asm so I didn't
> > really expect any. Having it escape would probably result in fairly
> > instant wreckage though.
> >
> > DF=1 results in things like rep mov going _backwards_.
>
> Ok, I wonder if we really need to add this then.

Well, Linus asked for it, and it was a fairly trivial add-on :-)

\
 
 \ /
  Last update: 2019-03-10 14:14    [W:0.078 / U:2.204 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site