linux-kernel - Re: [PATCH RFC] [1/9] Core module symbol namespaces code and intro.

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Message-ID: <20071127141242.GA26794@one.firstfloor.org>
Date:	Tue, 27 Nov 2007 15:12:42 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Andi Kleen <andi@...stfloor.org>, rusty@...tcorp.com.au,
	rdreier@...co.com, 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.

> OK, short of making IPv4 a module (which would be a worthy task :)

At some point there were patches, it is probably not very difficult.
But DaveM resisted at some point because he didn't want people
to replace the network stack (although I personally don't have a problem
with that)

> do you have an example where a symbol is used by more than one module
> but needs to be put into a namespace?

For SCSI: SD,SR,SG etc.
For Networking: e.g. symbols i put into inet, which are only
used by protocols (sctp, dccp, udplite, ipv6)
I already caught someone doing something wrong with that BTW -- 
wanrouter clearly does some things it shouldn't be doing. 
Or the fib namespace, where all the fib functions should be only
used by the two fib_* modules and ipv6/decnet.
For KVM: the exports used by kvm_amd/intel
For arch/x86: e.g. e820_*, IO_APIC_get_PCI_irq_vector, swiotlb, 
a lot of stuff only used by acpi processor.c, pcibios*, etc.etc.
Roland gave another example for Infiniband.

Also in general it allows flexibility later if modules get split.

-Andi
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