lkml.org 
[lkml]   [2014]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 4/5] x86/mce: Simplify flow when handling recoverable memory errors
On Wed, Nov 12, 2014 at 06:20:58PM +0100, Oleg Nesterov wrote:
> Sorry, I am a bit confused...
>
> On 11/11, Borislav Petkov wrote:
> >
> > Roughly speaking, we want to be able to mark a task with the sign of
> > death and to kill it, if needed.
>
> "it" is current, yes?

Yes.

> So I agree with Andy, task_work_add() can work and you can also pass
> paddr/restartable to the handler.

Yes, and it is much simpler than changing the entry.S glue to switch to
the kernel stack for our purposes.

> But,
>
> > The important part is *before* it
> > gets to run again.
>
> But it is already running? Perhaps you meant "before it returns to
> user-mode" ?

Right, it runs, while it does so, it triggers an MCE because it touches
some corrupted memory, we jump to the #MC handler and before we return
to user space, we kill that process.

--
Regards/Gruss,
Boris.

Sent from a fat crate under my desk. Formatting is fine.
--


\
 
 \ /
  Last update: 2014-11-12 19:01    [W:0.275 / U:6.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site