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

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Date:	Tue, 24 Jan 2012 10:47:19 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	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>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>, Valdis.Kletnieks@...edu
Subject: Re: [patch 2/4] [RFC] syscalls, x86: Add __NR_kcmp syscall v4

On Tue, Jan 24, 2012 at 11:16:55AM +0900, KAMEZAWA Hiroyuki wrote:
...
> > 
> > Index: linux-2.6.git/arch/x86/include/asm/kcmp.h
> > ===================================================================
> > --- /dev/null
> > +++ linux-2.6.git/arch/x86/include/asm/kcmp.h
> > @@ -0,0 +1,17 @@
> > +#ifndef _LINUX_KCMP_H
> > +#define _LINUX_KCMP_H
> > +
> > +/* Comparision type */
> > +enum {
> > +	KCMP_FILE,
> > +	KCMP_VM,
> > +	KCMP_FILES,
> > +	KCMP_FS,
> > +	KCMP_SIGHAND,
> > +	KCMP_IO,
> > +	KCMP_SYSVSEM,
> > +
> > +	KCMP_TYPES,
> > +};
> > +
> > +#endif /* _LINUX_KCMP_H */
> 
> Why under /arch ?
> 

Hi Kame,

because I've tested it under x86 only. Once someone
confirm it's needed on some else arch and does work
as expected -- it wont be a problem to make it system
wide. Until then -- I think better to stick with
at least tested case.
...
> > +
> > +static long kptr_obfuscate(long v, int type)
> > +{
> > +	return (v + cookies[type][0]) ^ cookies[type][1];
> > +}
> > +
> 
> I'm sorry could you add comments to swho what this does ?

The idea is disorder the in-memory order but remain order
suitable for sorting. Anywa, as Peter pointed this helper
must be redone. I'll post updated version.

> 
> It seems this function itself doesn't depend on arch.
> 

Yes, it doesn't. But as I said if someone confirm it's
needed on non-x86 and get tested, that will not be a
problem to make it system-side.

	Cyrill
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