linux-kernel - Re: invalidate caches before going into suspend

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: <200808131230.07581.mark.langsdorf@amd.com>
Date:	Wed, 13 Aug 2008 12:30:07 -0500
From:	Mark Langsdorf <mark.langsdorf@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: invalidate caches before going into suspend

On Wednesday 13 August 2008, Linus Torvalds wrote:
> 
> On Wed, 13 Aug 2008, Mark Langsdorf wrote:
> > 
> > I don't think it's necessary.  I can submit a delta patch later if you
> > think it's really necessary.
> 
> Why not at least move it to after the local_irq_disable()?
> 
> That local_irq_disable() will do tons of writes if you have 
> lockdep enabled, it calls trace_hardirqs_off() etc. Maybe they don't end 
> up ever mattering, but wouldn't it make much more sense to just move the 
> wbinvd down to just before the
> 
> 	while (1)
> 		halt();
> 
> which is also likely to make sure that the compiler won't do anything at 
> all because everything is dead at that point with no function calls etc 
> happening.

I don't think we realized that local_irq_disable() did all that and
so we only tested the submitted patch.  I've resubmitted the unified
patch after applying your suggestion.  Thanks.

-Mark Langsdorf
Operating System Research Center
AMD

--
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/