lkml.org 
[lkml]   [2019]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [RFC][PATCH] objtool: STAC/CLAC validation
From
On February 23, 2019 12:39:42 AM PST, Peter Zijlstra <peterz@infradead.org> wrote:
>On Fri, Feb 22, 2019 at 03:39:48PM -0800, hpa@zytor.com wrote:
>> Objtool could also detect CLAC-STAC or STAC-CLAC sequences without
>> memory operations and remove them; don't know how often that happens,
>> but I know it *does* happen.
>
>Objtool doesn't know about memops; that'd be a lot of work. Also,
>objtool doesn't actually rewrite the text, at best it could warn about
>such occurences.

It doesn't even have to change the text per se, just nullify the altinstr.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

\
 
 \ /
  Last update: 2019-02-25 09:54    [W:0.087 / U:13.052 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site