linux-kernel - Re: [PATCH 3/3] EDAC: carve out AMD MCE decoding logic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091002182659.GA16436@aftab>
Date:	Fri, 2 Oct 2009 20:26:59 +0200
From:	Borislav Petkov <borislav.petkov@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <petkovbb@...glemail.com>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] EDAC: carve out AMD MCE decoding logic

On Fri, Oct 02, 2009 at 03:39:54PM +0200, Ingo Molnar wrote:
> I suspect this is fine currently because no two EDAC modules should be 
> active at the same time. A followup cleanup patch would be nice 
> nevertheless that uses a notifier chain here with proper 
> register/unregister locking.

Please do elaborate for I can't seem to follow.

AFAICT, we are going to have max one MCE decoder at any one time so no
need to notify it.

The x86_mce_decode_callback assignment probably needs locking just to be
on the safe side. We can do a

mce_set_decode_callback(void (*f)(struct mce*m))

helper which falls back to default_decode_mce() whenever its being
passed a NULL for *f using proper locking...

I'm pretty sure I'm missing something though...

-- 
Regards/Gruss,
Boris.

Operating | Advanced Micro Devices GmbH
  System  | Karl-Hammerschmidt-Str. 34, 85609 Dornach b. München, Germany
 Research | Geschäftsführer: Andrew Bowd, Thomas M. McCoy, Giuliano Meroni
  Center  | Sitz: Dornach, Gemeinde Aschheim, Landkreis München
  (OSRC)  | Registergericht München, HRB Nr. 43632

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