linux-kernel - Re: [PATCH] x86/entry/64: Context-track syscalls before enabling interrupts

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Message-ID: <CALCETrUJQNWuJM_WMA1D_=OZ47WVXrmtw+ZF+-T0r=j1=9uUdg@mail.gmail.com>
Date:	Wed, 19 Aug 2015 08:54:20 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	X86 ML <x86@...nel.org>, Sasha Levin <sasha.levin@...cle.com>,
	Brian Gerst <brgerst@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86/entry/64: Context-track syscalls before enabling interrupts

On Tue, Aug 18, 2015 at 5:30 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Tue, Aug 18, 2015 at 12:11 PM, Andy Lutomirski <luto@...nel.org> wrote:
>> This fixes a couple minor holes if we took an IRQ very early in syscall
>> processing:
>>
>
> The patch is buggy.  v2 coming soon, hopefully.
>

No, let's drop this for now.  It would be straightforward but quite
messy to fix it, and I don't want to introduce further
incomprehensibility into the asm.  I'll send the warning change
instead, and we can fix it better for 4.4

--Andy
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