linux-kernel - Re: [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe

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Message-ID: <CALCETrW8D2-iPga4yveHEM+XgUwJocbBkpKyM5sWqKrRq2-BrQ@mail.gmail.com>
Date:	Fri, 24 Jul 2015 21:59:16 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Gerst <brgerst@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>, Willy Tarreau <w@....eu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe

On Fri, Jul 24, 2015 at 9:32 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Fri, Jul 24, 2015 at 09:28:47PM -0700, Andy Lutomirski wrote:
>> Yeah, I'm going to submit v2 with the simple approach.  I admit I'm
>> rather fond of xadd as a way to switch rsp and set a flag at the same
>> time, though :)
>
> I know you are.
>
> But people will rip your head out if you added 60 cycles to the IRQ
> path.

And people will give me five new heads if I ignore Linus and do RET
even with IF=1, saving 300 cycles?

--Andy
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