kvm-13

kvm-13

[Omar Khan]

hi,

   "make install" does not install the modules in the right directory (actually
it is not making the 'extra' directory). I changed

       KERNELDIR ?= /lib/modules/$(shell uname -r)/build
to
       KERNELDIR := /lib/modules/$(shell uname -r)/build

in the kernel/Makefile and it is working now.

Omar





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Re: kvm-13

[Muli Ben-Yehuda]

On Thu, Feb 08, 2007 at 03:46:25PM +0000, Omar Khan wrote:
> hi,
> 
>    "make install" does not install the modules in the right directory (actually
> it is not making the 'extra' directory). I changed
> 
>        KERNELDIR ?= /lib/modules/$(shell uname -r)/build
> to
>        KERNELDIR := /lib/modules/$(shell uname -r)/build
> 
> in the kernel/Makefile and it is working now.

That will probably break --kerneldir again. I have to run now but I
will look into it ASAP - I suspect the problem is elsewhere.

Cheers,
Muli

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Re: kvm-13

[Muli Ben-Yehuda]

On Thu, Feb 08, 2007 at 03:46:25PM +0000, Omar Khan wrote:
> hi,
> 
>    "make install" does not install the modules in the right
>    directory (actually it is not making the 'extra' directory). I
>    changed
> 
>        KERNELDIR ?= /lib/modules/$(shell uname -r)/build
> to
>        KERNELDIR := /lib/modules/$(shell uname -r)/build
> 
> in the kernel/Makefile and it is working now.

- what does 'grep KERNELDIR config.mak' at the top level say after
  you've run configure? your change should not have any effect since
  KERNELDIR is set in config.mak to /lib/modules/$(shell uname
  -r)/build if --kerneldir is not specified. Did you do 'make install'
  without configuring and building first?

- 'make install' seems pretty bogus, it relies on KERNELDIR ending in
  'build', which is wrong for --kerneldir=xxx and it uses DESTDIR
  without ever setting it. What was DESTDIR supposed to do? any
  objections to removing it?

Cheers,
Muli

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Re: kvm-13

[Omar Khan]

Muli Ben-Yehuda <muli@...> writes:

> 
> On Thu, Feb 08, 2007 at 03:46:25PM +0000, Omar Khan wrote:
> > hi,
> > 
> >    "make install" does not install the modules in the right
> >    directory (actually it is not making the 'extra' directory). I
> >    changed
> > 
> >        KERNELDIR ?= /lib/modules/$(shell uname -r)/build
> > to
> >        KERNELDIR := /lib/modules/$(shell uname -r)/build
> > 
> > in the kernel/Makefile and it is working now.
> 
> - what does 'grep KERNELDIR config.mak' at the top level say after
>   you've run configure? your change should not have any effect since
>   KERNELDIR is set in config.mak to /lib/modules/$(shell uname
>   -r)/build if --kerneldir is not specified. Did you do 'make install'
>   without configuring and building first?
> 
> - 'make install' seems pretty bogus, it relies on KERNELDIR ending in
>   'build', which is wrong for --kerneldir=xxx and it uses DESTDIR
>   without ever setting it. What was DESTDIR supposed to do? any
>   objections to removing it?
> 
> Cheers,
> Muli
> 
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> 


I am using opensuse 10.2 and the build directory is linked to the default
directory: 

lrwxrwxrwx 1 root root 43 Feb  7 01:29 /lib/modules/2.6.18.2-34-default/build ->
/usr/src/linux-2.6.18.2-34-obj/i386/default

so KERNELDIR get set to the default directory (KERNELDIR=$(readlink -f
$kerneldir)) in configure

I installed kvm-12 before this, could it have caused this?

Omar 


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Re: kvm-13

[Muli Ben-Yehuda]

On Fri, Feb 09, 2007 at 10:50:36AM +0000, Omar Khan wrote:

> I am using opensuse 10.2 and the build directory is linked to the default
> directory: 
> 
> lrwxrwxrwx 1 root root 43 Feb  7 01:29 /lib/modules/2.6.18.2-34-default/build ->
> /usr/src/linux-2.6.18.2-34-obj/i386/default
> 
> so KERNELDIR get set to the default directory (KERNELDIR=$(readlink
> -f $kerneldir)) in configure

That does not explain why the change you made (from ?= to :=) made any
difference. Could you send a full log of ./configure && make && make
install with and without your change?

Thanks,
Muli

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Re: kvm-13

[Omar Khan]

Muli Ben-Yehuda <muli@...> writes:


> That does not explain why the change you made (from ?= to :=) made any
> difference. Could you send a full log of ./configure && make && make
> install with and without your change?
> 

Well from what I have observed this makes a difference because in config.mak 

KERNELDIR=/usr/src/linux-2.6.18.2-34-obj/i386/default

This gets included in the kernel/Makefile and when make reaches

KERNELDIR ?= /lib/modules/$(shell uname -r)/build

KERNELDIR is already set (to default) so it does not set it to /build. Now when
it does

INSTALLDIR = $(patsubst %/build, %/extra, $(KERNELDIR)))

nothing gets replaced since there is no 'build' to replace. So nothing gets
installed in /lib/modules/2.6.18.2-34-default/extra/ and hence modprobe fails.

if I replace ?= with := it KERNELDIR is changed to /lib/modules/$(shell uname
-r)/build and hence we get the INSTALLDIR for the /extra.

I will try to send the log for ./configure , make , make install.

Thanks

Omar Khan


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Re: kvm-13

[Muli Ben-Yehuda]

Thanks for the analysis, this problem is understood. Avi commited a
fix for -14 a few days back, but the fix re-breaks
--kerneldir. Reenabling --kerneldir is simple - see attached patch -
but since this is obviously a fragile area, I decided not to push for
its inclusion. Maybe I'm the sole --kerneldir user :-)

Index: kernel/Makefile
===================================================================
--- kernel/Makefile	(revision 4457)
+++ kernel/Makefile	(working copy)
@@ -1,4 +1,5 @@
-KERNELDIR := /lib/modules/$(shell uname -r)/build
+include ../config.mak
+
 KVERREL = $(patsubst /lib/modules/%/build,%,$(KERNELDIR))
 
 DESTDIR=
Index: configure
===================================================================
--- configure	(revision 4457)
+++ configure	(working copy)
@@ -94,7 +94,7 @@
 
 cat <<EOF > config.mak
 PREFIX=$prefix
-KERNELDIR=$(readlink -f $kerneldir)
+KERNELDIR="$kerneldir"
 WANT_MODULE=$want_module
 EOF
 



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Re: kvm-13

[Avi Kivity]

Muli Ben-Yehuda wrote:
> Thanks for the analysis, this problem is understood. Avi commited a
> fix for -14 a few days back, but the fix re-breaks
> --kerneldir. Reenabling --kerneldir is simple - see attached patch -
> but since this is obviously a fragile area, I decided not to push for
> its inclusion. Maybe I'm the sole --kerneldir user :-)
>
>   

I want --kerneldir to work; but as you say the build stuff is 
ridiculously fragile.

How was this tested?


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: kvm-13

[Muli Ben-Yehuda]

On Tue, Feb 20, 2007 at 09:46:17AM +0200, Avi Kivity wrote:
> Muli Ben-Yehuda wrote:
> >Thanks for the analysis, this problem is understood. Avi commited a
> >fix for -14 a few days back, but the fix re-breaks
> >--kerneldir. Reenabling --kerneldir is simple - see attached patch -
> >but since this is obviously a fragile area, I decided not to push for
> >its inclusion. Maybe I'm the sole --kerneldir user :-)
> >
> >  
> 
> I want --kerneldir to work; but as you say the build stuff is 
> ridiculously fragile.
> 
> How was this tested?

I used this simple script to compare vanilla and patched and verified
the output is the same:

onebuild ()
{
    ./configure --qemu-cc=gcc-3.4 $1 && echo "XXX configure done" && (cd kernel && make LINUX=~/kvm/linux-2.6 sync) && make
    echo "XXX installing..."
    sudo make install
    echo "XXX cleaning"
    make clean
}

make clean
onebuild --kerneldir=/home/muli/iommu/calgary/obj.linux/
onebuild --kerneldir=/lib/modules/`uname -r`/build
onebuild

The patch I used is this one:

Index: kernel/Makefile
===================================================================
--- kernel/Makefile	(revision 4461)
+++ kernel/Makefile	(working copy)
@@ -1,4 +1,5 @@
-KERNELDIR := /lib/modules/$(shell uname -r)/build
+include ../config.mak
+
 KVERREL = $(patsubst /lib/modules/%/build,%,$(KERNELDIR))
 
 DESTDIR=
Index: configure
===================================================================
--- configure	(revision 4461)
+++ configure	(working copy)
@@ -94,7 +94,7 @@
 
 cat <<EOF > config.mak
 PREFIX=$prefix
-KERNELDIR=$(readlink -f $kerneldir)
+KERNELDIR=$kerneldir
 WANT_MODULE=$want_module
 EOF
 

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Re: kvm-13

[Avi Kivity]

Muli Ben-Yehuda wrote:
> On Tue, Feb 20, 2007 at 09:46:17AM +0200, Avi Kivity wrote:
>   
>> Muli Ben-Yehuda wrote:
>>     
>>> Thanks for the analysis, this problem is understood. Avi commited a
>>> fix for -14 a few days back, but the fix re-breaks
>>> --kerneldir. Reenabling --kerneldir is simple - see attached patch -
>>> but since this is obviously a fragile area, I decided not to push for
>>> its inclusion. Maybe I'm the sole --kerneldir user :-)
>>>
>>>  
>>>       
>> I want --kerneldir to work; but as you say the build stuff is 
>> ridiculously fragile.
>>
>> How was this tested?
>>     
>
> I used this simple script to compare vanilla and patched and verified
> the output is the same:
>
>   

Great.  Applied, thanks.

-- 
error compiling committee.c: too many arguments to function


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Re: kvm-13

[richardvoigt-Re5JQEeQqe8AvxtiuMwx3w]

On 2/19/07, Omar Khan <okhan-e94Sedi4moU@public.gmane.org> wrote:
> Muli Ben-Yehuda <muli@...> writes:
>
>
> > That does not explain why the change you made (from ?= to :=) made any
> > difference. Could you send a full log of ./configure && make && make
> > install with and without your change?
> >
>
> Well from what I have observed this makes a difference because in config.mak
>
> KERNELDIR=/usr/src/linux-2.6.18.2-34-obj/i386/default

Because you passed the wrong path to configure --kerneldir=

This probably should be stated more explicitly in the configure --help
comment for kerneldir, which should make it clear that the path MUST
be /lib/modules/*/build

If it's not, not only will the module install fail, so will KVERREL!

If you want the default behavior, configure without specifying
--kerneldir, don't override the user's choice with the default.

I use --kerneldir too.  When I'm upgrading a kernel, there should be
no need to reboot (changing uname) in order to build out-of-tree
modules, I should be able to prebuild everything and reboot
seamlessly.

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