linux-kernel - Re: I.1 - System calls

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Message-Id: <1249309358.7924.96.camel@twins>
Date:	Mon, 03 Aug 2009 16:22:38 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	eranian@...il.com, Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Andi Kleen <andi@...stfloor.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>
Subject: Re: I.1 - System calls - ioctl

On Thu, 2009-07-30 at 19:20 +0200, Arnd Bergmann wrote:
> On Thursday 30 July 2009, stephane eranian wrote:
> > But that won't always work in the case of a 32-bit monitoring tool
> > running on top of
> > a 64-bit OS. Imagine the target id is indeed 64-bit, e.g., inode
> > number (as suggested
> > by Peter). It's not because you are a 32-bit tool than you cannot name
> > a monitoring
> > resource in a 64-bit OS.
> 
> Right, there are obviously things that you cannot address with 
> a 'long', but there are potentially other things that you could
> that you cannot address with an 'int', e.g. an opaque user
> token (representing a user pointer) that you can get back in
> the sample data.
> 
> In the worst case, you could still redefine the argument as a
> transparent union to a long and pointer in the future if you
> use a 'long' now. AFAICT, there are no advantages of using
> an 'int' instead of a 'long', but there are disadvantages of
> using a 'long long'.

OK, so time is running out on this thing. Ingo, Paulus what would you
prefer?

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