linux-kernel - Re: [RFC c/r 2/4] [RFC] syscalls, x86: Add __NR

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Message-ID: <20120127194058.GF11715@one.firstfloor.org>
Date:	Fri, 27 Jan 2012 20:40:58 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrey Vagin <avagin@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>, Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Alexey Dobriyan <adobriyan@...il.com>, Valdis.Kletnieks@...edu
Subject: Re: [RFC c/r 2/4] [RFC] syscalls, x86: Add __NR_kcmp syscall v7

> > The basic problem is if this interface is at the right level of abstraction.
> > I have some doubts on that. It seems like a long term maintenance nightmare to 
> > me. It may be better to put the loop that would call this into the kernel.
> > 
> 
> Hmm, ie selftest right in kenel?

Not testing, but more the general stability of the interface. IMHO it exposes
too many kernel internals. I know they are already exposed by clone/unshare, 
but in those nothing breaks if the user program doesn't know about some new
flags. But this looks like the user always has to be updated for every change.
I think I would prefer if more of the user was in kernel to not expose
that much.


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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