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

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Date:	Tue, 29 Apr 2008 19:29:47 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: vm86 - hide X86_VM_MASK from userland programs v2

[Ingo Molnar - Mon, Apr 28, 2008 at 09:20:39PM +0200]
| 
| Cyrill,
| 
| randconfig testing in x86.git found a build bug and i bisected it to 
| your patch - output is below. Config attached. Looks like some config 
| file dependency hell problem? The dependencies there definitely need a 
| good look and a handful of cleanups as well.
| 
| 	Ingo
| 
| --------------------->
| In file included from include/asm/vm86.h:139,
|                  from include/asm/processor.h:11,
|                  from include/asm/atomic_32.h:6,
|                  from include/asm/atomic.h:3,
|                  from include/linux/crypto.h:21,
|                  from arch/x86/kernel/asm-offsets_32.c:8,
|                  from arch/x86/kernel/asm-offsets.c:3:
| include/asm/ptrace.h: In function 'user_mode_vm':
| include/asm/ptrace.h:207: error: 'X86_VM_MASK' undeclared (first use in this function)
| include/asm/ptrace.h:207: error: (Each undeclared identifier is reported only once
| include/asm/ptrace.h:207: error: for each function it appears in.)
| include/asm/ptrace.h: In function 'v8086_mode':
| include/asm/ptrace.h:217: error: 'X86_VM_MASK' undeclared (first use in this function)

Argh! Ingo, it seems that the real problem was introdused by

commit 8fc37f2c474b8ea61186fd77193324845432447b
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Tue Oct 23 22:37:24 2007 +0200

    x86: merge ptrace_32/64.h

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

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 -
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