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Date: Mon, 26 Nov 2007 10:25:33 -0800 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: Rusty Russell <rusty@...tcorp.com.au> Cc: Roland Dreier <rdreier@...co.com>, Andi Kleen <ak@...e.de>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, sam@...nborg.org Subject: Re: [PATCH RFC] [1/9] Core module symbol namespaces code and intro. On Mon, 26 Nov 2007 12:28:14 +1100 Rusty Russell <rusty@...tcorp.com.au> wrote: > On Monday 26 November 2007 07:27:03 Roland Dreier wrote: > > > This patch allows to export symbols only for specific modules by > > > introducing symbol name spaces. A module name space has a white > > > list of modules that are allowed to import symbols for it; all others > > > can't use the symbols. > > > > > > It adds two new macros: > > > > > > MODULE_NAMESPACE_ALLOW(namespace, module); > > > > I definitely like the idea of organizing exported symbols into > > namespaces. However, I feel like it would make more sense to have > > something like > > > > MODULE_NAMESPACE_IMPORT(namespace); > > Except C doesn't have namespaces and this mechanism doesn't create them. So > this is just complete and utter makework; as I said before, noone's going to > confuse all those udp_* functions if they're not in the udp namespace. > > For better or worse, this is not C++. > Agreed. On first glance, I was intrigued but: 1) Why is everyone so concerned that export symbol space is large? - does it cost cpu or running memory? - does it cause bugs? - or are you just worried about "evil modules"? 2) These aren't real namespaces - all global names still have to be unique - still have to handle the "non-modular build" namespace conflicts - there isn't a big problem with conflicting symbols today. So why bother adding complexity. -- Stephen Hemminger <shemminger@...ux-foundation.org> - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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