linux-kernel - Re: [PATCH 4/7] x86/vm86: Move vm86 fields out of thread

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Message-ID: <CALCETrVSJAWH7RutVeXd_Y1bdOdw_-5gv6iDspyf0p8k2D8EyA@mail.gmail.com>
Date:	Fri, 17 Jul 2015 12:01:55 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Brian Gerst <brgerst@...il.com>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4/7] x86/vm86: Move vm86 fields out of thread_struct

On Thu, Jul 16, 2015 at 4:46 AM, Brian Gerst <brgerst@...il.com> wrote:
> Allocate a separate structure for the vm86 fields.
>

> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -315,12 +315,12 @@ check_v8086_mode(struct pt_regs *regs, unsigned long address,
>  {
>         unsigned long bit;
>
> -       if (!v8086_mode(regs))
> +       if (!v8086_mode(regs) || !tsk->thread.vm86)
>                 return;
>

What's this for?  Shouldn't that "if (!v8086_mode(regs) ||
WARN_ON(!tsk->thread.vm86))"?

--Andy
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