linux-kernel - Re: [PATCH -tip -v12 01/11] x86: instruction decoder API

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Date:	Thu, 16 Jul 2009 16:48:40 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>, Jim Keniston <jkenisto@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Avi Kivity <avi@...hat.com>,
	Przemys??awPawe??czyk <przemyslaw@...elczyk.it>
Subject: Re: [PATCH -tip -v12 01/11] x86: instruction decoder API

Sam Ravnborg wrote:
> On Thu, Jul 16, 2009 at 01:28:54PM -0400, Masami Hiramatsu wrote:
>> Sam Ravnborg wrote:
>>>> diff --git a/arch/x86/include/asm/inat.h b/arch/x86/include/asm/inat.h
>>>> new file mode 100644
>>>> index 0000000..01e079a
>>>> --- /dev/null
>>>> +++ b/arch/x86/include/asm/inat.h
>>>> @@ -0,0 +1,125 @@
>>>> +#ifndef _ASM_INAT_INAT_H
>>>> +#define _ASM_INAT_INAT_H
>>> [With reference to comment on patch 2/12...]
>>> You create inat.h here.
>>> Could you investigave what is needed to factor out the stuff
>>> needed from userspace so we can avoid the ugly havk where
>>> you redefine types.h?
>> Sorry, I'm a bit confusing.
>> Would you mean that I should break down user_include.h and
>> add those redefined types in inat.h?
> No - try to factor out what is needed for your program
> so you can avoid user_include.h entirely.
>>> Maybe create a inat_types.h + inat.h as we do in other cases?
>> And inat_types.h has two parts, one for kernel, and one for
>> userspace(which is moved from user_include.h), is that right?
> More like inat_types.h include pure definitions and inat.h
> define all the macros (that would be much nicer if expressed
> as static inlines).

OK, some macros still need to be macros, because it will be used
for defining static tables.

> The real thing to consider is what is needed from your userspace
> program and is also required by the kernel.
> I did not event remotely try to find out - as I guess you know it.
> So try to isolate these bits somehow and you have then nicely dropped
> a lot of dependencies on the remainign headers and can thus
> hopefully get rid of the ugly usser_include.h hack.

OK, I'll try to remove user_include.h hack.

Thank you so much!


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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