linux-kernel - Re: [PATCH] x86: vm86 - hide X86_VM

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Message-ID: <481742C1.5040709@zytor.com>
Date:	Tue, 29 Apr 2008 08:46:09 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: vm86 - hide X86_VM_MASK from userland programs v2

Cyrill Gorcunov wrote:
> | 
> | with this patch we have <asm/vm86.h> included only
> | if __i386__ defined *BUT* X86_VM_MASK is tried to be
> | used *without* __386__ being checked (as example - ptrace.h:user_mode_vm).
> | I'm not sure how to properly hanle this situation. But will take a look.
> | 
> | So I suggest you drop my last patch (which moves X86_VM_MASK
> | into __KERNEL__ section) for a while. I'll recheck all
> | this stuff later (too busy now).
> | 
> | 		- Cyrill -
> 
> Thomas, could you take a look please - is my suspicious wrong?
> 
> 		- Cyrill -

X86_VM_MASK should be defined to zero on x86-64.  Part of the reason for 
this symbol is so we don't have to put #ifdef around its uses.

	-hpa
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