compiling only one module in kernel version 2.6?

compiling only one module in kernel version 2.6?

[Fong Vang]

What's the easiest way to compile just one module in the Linux 2.6 kernel tree?

This no longer seem to work:

  $ cd /usr/src/linux
  $ make SUBDIRS=fs/reiserfs modules
           Building modules, stage 2.
           MODPOST

  I don't see any .ko generated.

Re: compiling only one module in kernel version 2.6?

[Steven Rostedt]

On Tue, 2005-08-16 at 19:09 -0700, Fong Vang wrote:
> What's the easiest way to compile just one module in the Linux 2.6 kernel tree?
> 
> This no longer seem to work:
> 
>   $ cd /usr/src/linux
>   $ make SUBDIRS=fs/reiserfs modules
>            Building modules, stage 2.
>            MODPOST
> 
>   I don't see any .ko generated.

It worked for me. Is your reiserfs turned on as a module, and not
compiled into the kernel. (<M> not <*> nor < >)

-- Steve

Re: compiling only one module in kernel version 2.6?

[Randy.Dunlap]

On Tue, 16 Aug 2005 23:18:49 -0400 Steven Rostedt wrote:

> On Tue, 2005-08-16 at 19:09 -0700, Fong Vang wrote:
> > What's the easiest way to compile just one module in the Linux 2.6 kernel tree?
> > 
> > This no longer seem to work:
> > 
> >   $ cd /usr/src/linux
> >   $ make SUBDIRS=fs/reiserfs modules
> >            Building modules, stage 2.
> >            MODPOST
> > 
> >   I don't see any .ko generated.
> 
> It worked for me. Is your reiserfs turned on as a module, and not
> compiled into the kernel. (<M> not <*> nor < >)

Sam only added make .ko build support very recently,
so it could easily depend on what kernel verison Fong is using.

---
~Randy

Re: compiling only one module in kernel version 2.6?

[Steven Rostedt]

On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> 
> Sam only added make .ko build support very recently,
> so it could easily depend on what kernel verison Fong is using.

That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
(2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
recent kernel.

-- Steve

Re: compiling only one module in kernel version 2.6?

[Steven Rostedt]

On Wed, 2005-08-17 at 01:48 -0400, Steven Rostedt wrote:
> On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> > 
> > Sam only added make .ko build support very recently,
> > so it could easily depend on what kernel verison Fong is using.
> 
> That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
> (2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
> recent kernel.
> 

I just did this on a 2.6.9 vanilla kernel, and it still worked. How
"recent" did Sam do this?

-- Steve

Re: compiling only one module in kernel version 2.6?

[Randy.Dunlap]

On Wed, 17 Aug 2005 01:54:50 -0400 Steven Rostedt wrote:

> On Wed, 2005-08-17 at 01:48 -0400, Steven Rostedt wrote:
> > On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> > > 
> > > Sam only added make .ko build support very recently,
> > > so it could easily depend on what kernel verison Fong is using.
> > 
> > That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
> > (2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
> > recent kernel.
> > 
> 
> I just did this on a 2.6.9 vanilla kernel, and it still worked. How
> "recent" did Sam do this?

2.6.9 did not handle "make one_module.ko" (for me on x86).

2005-july-08:
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=155ad605b3c9c5874ff068f23c6ea8537190e0a8

---
~Randy

Re: compiling only one module in kernel version 2.6?

[Sam Ravnborg]

On Wed, Aug 17, 2005 at 01:54:50AM -0400, Steven Rostedt wrote:
> On Wed, 2005-08-17 at 01:48 -0400, Steven Rostedt wrote:
> > On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> > > 
> > > Sam only added make .ko build support very recently,
> > > so it could easily depend on what kernel verison Fong is using.
> > 
> > That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
> > (2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
> > recent kernel.
> > 
> 
> I just did this on a 2.6.9 vanilla kernel, and it still worked.

Hi Steve.

make fs/reiserfs/
and
make fs/reiserfs/resiserfs.ko

does not do the same thing. Only the latter result in a .ko file.

	Sam

Re: compiling only one module in kernel version 2.6?

[Steven Rostedt]

On Thu, 2005-08-18 at 19:42 +0200, Sam Ravnborg wrote:
> On Wed, Aug 17, 2005 at 01:54:50AM -0400, Steven Rostedt wrote:
> > On Wed, 2005-08-17 at 01:48 -0400, Steven Rostedt wrote:
> > > On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> > > > 
> > > > Sam only added make .ko build support very recently,
> > > > so it could easily depend on what kernel verison Fong is using.
> > > 
> > > That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
> > > (2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
> > > recent kernel.
> > > 
> > 
> > I just did this on a 2.6.9 vanilla kernel, and it still worked.
> 
> Hi Steve.
> 
> make fs/reiserfs/
> and
> make fs/reiserfs/resiserfs.ko
> 
> does not do the same thing. Only the latter result in a .ko file.

I never said I did a "make fs/reiserfs". I did a 
"make SUBDIRS=fs/reiserfs"  which does produce a .ko file.  

But even shorter is to do a "make M=fs/reiserfs", which also works.

But, I guess what was added was the ability to just type the module
itself.  That's cool, but I haven't had the need to do that (yet).

-- Steve

Re: compiling only one module in kernel version 2.6?

[Randy.Dunlap]

On Thu, 18 Aug 2005, Steven Rostedt wrote:

> On Thu, 2005-08-18 at 19:42 +0200, Sam Ravnborg wrote:
> > On Wed, Aug 17, 2005 at 01:54:50AM -0400, Steven Rostedt wrote:
> > > On Wed, 2005-08-17 at 01:48 -0400, Steven Rostedt wrote:
> > > > On Tue, 2005-08-16 at 22:41 -0700, Randy.Dunlap wrote:
> > > > >
> > > > > Sam only added make .ko build support very recently,
> > > > > so it could easily depend on what kernel verison Fong is using.
> > > >
> > > > That could very well explain it. I'm doing this on 2.6.13-rc6-rt6
> > > > (2.6.13-rc6 with Ingo's rt6 patch applied).  So I really do have a
> > > > recent kernel.
> > > >
> > >
> > > I just did this on a 2.6.9 vanilla kernel, and it still worked.
> >
> > Hi Steve.
> >
> > make fs/reiserfs/
> > and
> > make fs/reiserfs/resiserfs.ko
> >
> > does not do the same thing. Only the latter result in a .ko file.
>
> I never said I did a "make fs/reiserfs". I did a
> "make SUBDIRS=fs/reiserfs"  which does produce a .ko file.

That command uses an implicit target of all (which is
bzImage + modules), and then SUBDIRS (or M) limits it to
the specified subdir., so it builds all modules in the
specified subdir.
As opposed to what I thought(?) the OP was asking about:
how to build one module only.

I think that we have nailed it enough now, yes?  :)

> But even shorter is to do a "make M=fs/reiserfs", which also works.
>
> But, I guess what was added was the ability to just type the module
> itself.  That's cool, but I haven't had the need to do that (yet).

-- 
~Randy