Rv: Re: knewbies project? - updating LDD3 source

Rv: Re: knewbies project? - updating LDD3 source

[Ezequiel García]

> > De: DG <dangets@gmail.com>
> > Asunto: Re: knewbies project? - updating LDD3 source
> > Para: "Jim Cromie" <jim.cromie@gmail.com>
> > Cc: "kernelnewbies" <kernelnewbies@kernelnewbies.org>
> > Fecha: martes, 24 de mayo de 2011, 15:14
> > On Tue, May 24, 2011 at 11:47 AM,
> > Robert P. J. Day
> > <rpjday@crashcourse.ca>
> > wrote:
> > > On Tue, 24 May 2011, Jim Cromie wrote:
> > >
> > >> over at http://code.google.com/p/ldd3/
> > >> it says:
> > >> The famous "Linux Device Drivers" released
> the
> > sample code. but the
> > >> code does not reflect the latest kernel
> updates,
> > some of code cannot
> > >> even compile. This project is to make it
> > compatible with the current
> > >> kernel.
> > >>
> > >> http://lwn.net/Kernel/LDD3/
> > >> http://examples.oreilly.com/9780596005900/
> > >
> > > ?the one caution i would give here is that quite
> a
> > bit of code in
> > > LDD3 shouldn't be updated, anyway, since it
> reflects
> > features that
> > > have been deprecated for quite some time.
> > >
> > > ?for instance, no one should be writing proc
> files
> > anymore. ?also,
> > > ioctl()s are also discouraged for the most part.
> ?so
> > i would be
> > > selective about what parts of LDD3 code *should*
> be
> > updated as
> > > examples of good kernel programming.
> > >
> > > rday
> > 
> > There is a repo on GitHub with the same purpose.? I
> > haven't checked it
> > out personally, but it's probably worth a look.
> > 
> > https://github.com/martinezjavier/ldd3
> 
> I've found the same googlecode svn repo a while ago, but
> since it was very out-dated, I decided to start my own
> project on github.
> 
> https://github.com/ezequielgarcia/ldd3-examples
> 
> I am working against 2.6.37; but currently, the only module
> that really compiles is scull and scullpipe. martinezjavier
> git repo seems much updated; too bad I haven't find that
> when I looked for !
> 
> Maybe we should concentrate our efforts, despite for me it
> was just a learning project.
> 
> Greetings,
> Ezequiel.
> 
> 
> 

Rv: Re: knewbies project? - updating LDD3 source

[Javier Martinez Canillas]

>> >
>> > There is a repo on GitHub with the same purpose.? I
>> > haven't checked it
>> > out personally, but it's probably worth a look.
>> >
>> > https://github.com/martinezjavier/ldd3
>>
>> I've found the same googlecode svn repo a while ago, but
>> since it was very out-dated, I decided to start my own
>> project on github.
>>
>> https://github.com/ezequielgarcia/ldd3-examples
>>
>> I am working against 2.6.37; but currently, the only module
>> that really compiles is scull and scullpipe. martinezjavier
>> git repo seems much updated; too bad I haven't find that
>> when I looked for !
>>
>> Maybe we should concentrate our efforts, despite for me it
>> was just a learning project.
>>
>> Greetings,
>> Ezequiel.

Yes, it would be better to concentrate our efforts. When I needed to
update the examples to a more recent kernel I had the same problem
than you do. I did find a few repos but they were outdated. I send a
few patches to some of the authors but i didn't have any feedback so I
(sadly) had to start (yet another) LDD3 repo.

But probably the best idea is to think a good example set to include
in the kernel's samples dir. I just don't know what is the policy
about the code that reside in that dir. In the meantime patches are
welcomed so I can include more examples in this repo. I will try to
keep this repo compiling with newer kernels but I probably won't have
to much time to add more examples.

-- 
Javier Mart?nez Canillas
(+34) 682 39 81 69
PhD Student in High Performance Computing
Computer Architecture and Operating System Department (CAOS)
Universitat Aut?noma de Barcelona
Barcelona, Spain

Rv: Re: knewbies project? - updating LDD3 source

[Robert P. J. Day]

On Tue, 24 May 2011, Javier Martinez Canillas wrote:

> >> >
> >> > There is a repo on GitHub with the same purpose.? I
> >> > haven't checked it
> >> > out personally, but it's probably worth a look.
> >> >
> >> > https://github.com/martinezjavier/ldd3
> >>
> >> I've found the same googlecode svn repo a while ago, but
> >> since it was very out-dated, I decided to start my own
> >> project on github.
> >>
> >> https://github.com/ezequielgarcia/ldd3-examples
> >>
> >> I am working against 2.6.37; but currently, the only module
> >> that really compiles is scull and scullpipe. martinezjavier
> >> git repo seems much updated; too bad I haven't find that
> >> when I looked for !
> >>
> >> Maybe we should concentrate our efforts, despite for me it
> >> was just a learning project.
> >>
> >> Greetings,
> >> Ezequiel.
>
> Yes, it would be better to concentrate our efforts. When I needed to
> update the examples to a more recent kernel I had the same problem
> than you do. I did find a few repos but they were outdated. I send a
> few patches to some of the authors but i didn't have any feedback so
> I (sadly) had to start (yet another) LDD3 repo.
>
> But probably the best idea is to think a good example set to include
> in the kernel's samples dir. I just don't know what is the policy
> about the code that reside in that dir. In the meantime patches are
> welcomed so I can include more examples in this repo. I will try to
> keep this repo compiling with newer kernels but I probably won't
> have to much time to add more examples.

  as i mentioned earlier, i'm currently doing something like this for
an introductory kernel programming and device drivers course i'm
updating but, since it's not my course originally and i'm doing this
in concert with someone else, i don't know how much i'll be allowed to
share publicly since all of that work will become part of the
courseware but let me throw out some ideas.

  first, don't worry if something is perfectly appropriate for the
kernel source samples/ directory.  just write something that
demonstrates a simple feature, test it, document it with comments, and
maybe post it here, and let others see it.  if it's good, worry about
submitting it for samples/ later.

  also (and something i'm particularly interested in), i want to write
examples that *emulate* certain kernel features.  as in, loadable
modules that simulate behaviour like hotplugging a new device, so you
can do something like that, then watch the uevents in user space to
see how they match up.

  mostly, just pick a kernel feature and start writing and posting.
others will tell you if you're on the right track.

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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