From: "Woodhouse, David" <dwmw@amazon.co.uk>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "andi@firstfloor.org" <andi@firstfloor.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tim.c.chen@linux.intel.com" <tim.c.chen@linux.intel.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"pjt@google.com" <pjt@google.com>,
"dave.hansen@intel.com" <dave.hansen@intel.com>,
"luto@amacapital.net" <luto@amacapital.net>,
"gregkh@linux-foundation.org" <gregkh@linux-foundation.org>
Subject: Re: [PATCH] x86/retpoline: Avoid return buffer underflows on context switch
Date: Mon, 8 Jan 2018 23:25:35 +0000 [thread overview]
Message-ID: <1515453935.4423.46.camel@amazon.co.uk> (raw)
In-Reply-To: <20180108222604.GW29822@worktop.programming.kicks-ass.net>
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On Mon, 2018-01-08 at 23:26 +0100, Peter Zijlstra wrote:
>
> > is because that might get interpreted as a "push %rip" and not go on
> > the RSB at all. Hence the 'pause' between each one.
>
> OK, then make the comment say that.
Fixed. I've also shifted the #ifdef CONFIG_RETPOLINE to the call sites
instead of inside the FILL_RETURN_BUFFER macro itself. This is going to
get used with IBRS code too, Real Soon Now™.
http://git.infradead.org/users/dwmw2/linux-retpoline.git/commitdiff/6e961b86558
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next prev parent reply other threads:[~2018-01-08 23:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 20:15 [PATCH] x86/retpoline: Avoid return buffer underflows on context switch Andi Kleen
2018-01-08 21:38 ` David Woodhouse
2018-01-08 22:54 ` Andi Kleen
2018-01-08 22:11 ` Peter Zijlstra
2018-01-08 22:17 ` Woodhouse, David
2018-01-08 22:26 ` Peter Zijlstra
2018-01-08 23:25 ` Woodhouse, David [this message]
2018-01-08 22:25 ` Andi Kleen
2018-01-08 22:58 ` Andi Kleen
2018-01-09 0:15 ` Paul Turner
2018-01-09 0:15 ` Paul Turner
2018-01-09 0:44 ` Woodhouse, David
2018-01-09 0:48 ` David Woodhouse
2018-01-09 2:48 ` Paul Turner
2018-01-09 3:05 ` David Woodhouse
2018-01-12 11:15 ` David Laight
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