linux-kernel - Re: [PATCH 08/13] tpm: Pull everything related to /dev/tpmX into tpm-dev.c

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Message-ID: <20131003050504.GA2247@obsidianresearch.com>
Date:	Wed, 2 Oct 2013 23:05:04 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Peter H?we <PeterHuewe@....de>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Ashley Lai <ashley@...leylai.com>,
	Rajiv Andrade <mail@...jiv.net>,
	Leonidas Da Silva Barbosa <leosilva@...ux.vnet.ibm.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Sirrix AG <tpmdd@...rix.com>
Subject: Re: [PATCH 08/13] tpm: Pull everything related to /dev/tpmX into
 tpm-dev.c

On Wed, Oct 02, 2013 at 01:14:18AM +0200, Peter H?we wrote:

> > I botched the makefile changes for the new .c files.
> > 
> > I believe it should be like this:
> > 
> > obj-$(CONFIG_TCG_TPM) += tpm-core.o
> > tpm-core-y := tpm.o tpm-dev.o tpm-sysfs.o
> > 
> > > I added a suitable patch with the appropriate EXPORT_SYMBOL_GPL
> > > declarations to my testing branch. (also see next message)
> > 
> > EXPORT_SYMBOL_GPL is not correct, these are in-module references, not
> > cross module references, and I've deliberately not exported them to
> > prevent drivers from trying to use them inappropriately.

> Of course you're right - I just wanted to get it compile as fast as
> possible ;)

It looks like my solution changes the tpm module name to tpm-core.o.
This should be noted in the commit log:

 In doing so we also change the core tpm module name from 'tpm' to 'tpm-core',
 this is because kbuild does not like it if a multi-file module has a .c
 file of the same name.

Is that OK? It follows the pattern other systems have in the kernel.

If this is not OK, then I think we have to rename tpm.c to tpm-XX.c to
make the build system work.

I've consolidated all the remarks and changes thus far on my github:
 https://github.com/jgunthorpe/linux/commits/tpm-devel
 ec94ce9d29298ba75cec83a136fd841f8da9d528

(plus 1 more untested patch to remove the tpm-bios module)

Jason
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