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From: Peter Zijlstra <peterz@infradead.org>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	dan.j.williams@intel.com,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: Smatch check for Spectre stuff
Date: Mon, 23 Apr 2018 14:45:52 +0200	[thread overview]
Message-ID: <20180423124552.GY4064@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <fb72fc65-085b-65dc-c965-492d6d0902ea@embeddedor.com>

On Mon, Apr 23, 2018 at 07:31:03AM -0500, Gustavo A. R. Silva wrote:
> Hi Peter,
> 
> On 04/20/2018 07:00 AM, Peter Zijlstra wrote:
> > 
> > Hi Dan,
> > 
> > awesome stuff...
> > 
> > So I fear that many are actually things we want to fix. Our policy was
> > to kill the speculation on the first load and not worry if it can be
> > completed with a dependent load/store.
> > 
> I wonder if there is any thread where I can read the discussion about that
> policy that you mention.
> 
> Could you share it here, please?

I think it was somewhere in the many spectre variant1 threads when Linus
Alexei and Dan W were hashing out the mitigation thing. I cannot quickly
find the specific email.

Clarifying that position was one reason for the patches I did, Linus and
Dan W are on Cc and I figure that if they all agree we should maybe add
a little something to Documentation/speculation.txt.

  reply	other threads:[~2018-04-23 12:46 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19  5:15 Dan Carpenter
2018-04-19 21:39 ` Gustavo A. R. Silva
2018-04-20 12:00 ` Peter Zijlstra
2018-04-23 12:31   ` Gustavo A. R. Silva
2018-04-23 12:45     ` Peter Zijlstra [this message]
2018-04-23 13:08       ` Gustavo A. R. Silva
2018-04-23 13:48       ` Dan Williams
2018-04-20 12:25 ` Thomas Gleixner
2018-04-20 17:21   ` Oleg Nesterov
2018-04-20 12:47 ` Mark Rutland
2018-04-23 12:53   ` Dan Carpenter
2018-04-23 13:22     ` Mark Rutland
2018-04-23 13:26       ` Dan Carpenter
2018-04-23 17:11 ` Davidlohr Bueso
2018-04-25 13:19 ` Mark Rutland
2018-04-25 14:48   ` Alan Cox
2018-04-25 15:03     ` Mark Rutland
2018-06-08 16:12 ` Josh Poimboeuf
2018-06-11  9:28   ` Peter Zijlstra
2018-06-13 13:10   ` Dan Carpenter
2018-06-13 13:58     ` Dan Carpenter

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