[Dev] External kernel module building and kernel ABI/API check.

[Jacek Pielaszkiewicz]

Hi MyungJoo

	My answer below.

Best regrads


Jacek Pielaszkiewicz
Samsung R&D Institute Poland
Samsung Electronics
Email: j.pielaszkie at samsung.com



> -----Original Message-----
> From: MyungJoo Ham [mailto:myungjoo.ham at samsung.com]
> Sent: Friday, December 13, 2013 7:23 AM
> To: Jacek Pielaszkiewicz; artem.bityutskiy at linux.intel.com
> Cc: dev at lists.tizen.org
> Subject: Re: Re: [Dev] External kernel module building and kernel
> ABI/API check.
> 
> > Hi
> >
> > 	It was about the API used by external kernel modules.
> >
> >
> > Best regards
> 
> Hi Jacek,
> 
> 1. Could you please add a simple Documentation (Kernel/Documentation/*
> ?) about it?

In my last patch on tizen.org I added sample external module to show how to
use tools. 
Of course I will add some additional documentation to present more details.

> 2. Have you considered using the tool at host in host(x86)-target(arm)
> environment?

> 3. Could you consider using Kernel/tools/* directory for this abi-
> checker?

Regarding to your next two questions. My original plan was to use up a lot
of available 
functionality/mechanisms from the kernel. Therefore I used Module.symvers
file as basic 
source to get information about all exported kernel symbols and their
version (CRC).
I needed simple tool that performs operations like:
- Compare Module.symvers files for two different kernel version
- Compare kernel Module.symvers with similar file for kernel module
- Extract from external module all kernel symbols use be the module and 
  creates output file in format compatible with Module.symvers file. 

I didn't find tool that meet my needs therefore I decided to develop own. 
Most of operations performed by the tools are not depend on target 
architecture (text Module.symvers files testing). 

Regarding to module symbols extraction I use libelf to read ELF files. 
I tested the tool on x86 and it works fine.

> 
> 
> ps. I've rebased your gerrit patch; however, I'll wait a bit more for
> further review.
> 
> Cheers,
> MyungJoo.
> 
> >
> >
> >
> >
> > Jacek Pielaszkiewicz
> > Samsung R&D Institute Poland
> > Samsung Electronics
> > Email: j.pielaszkie at samsung.com
> >
> >
> >
> > > -----Original Message-----
> > > From: Artem Bityutskiy [mailto:artem.bityutskiy at linux.intel.com]
> > > Sent: Wednesday, December 11, 2013 12:45 PM
> > > To: Jacek Pielaszkiewicz
> > > Cc: dev at lists.tizen.org
> > > Subject: Re: [Dev] External kernel module building and kernel
> > > ABI/API check.
> > >
> > > On Tue, 2013-12-10 at 13:13 +0100, Jacek Pielaszkiewicz wrote:
> > > > Hi everyone,
> > > >
> > > >
> > > >       I would like to ask all of you for comments and also I
> would
> > > > like to present results of our works related to kernel and
> > > > external kernel modules build.
> > > >
> > > >
> > > >       We have the following plans:
> > > > 1. Deliver environment to build external kernel modules 2.
> Provide
> > > > functionality that detects changes in kernel ABI/API.
> > >
> > > From your e-mail it sounds like ABI/ABI that you refer to is about
> > > the internal kernel symbols.
> > >
> > > Could you please define more specifically what API/ABI in question
> is.
> > >
> > > --
> > > Best Regards,
> > > Artem Bityutskiy
> >
> >
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> >
> >
> >
> >