displaying kbuild dependancies ...

displaying kbuild dependancies ...

[Herbert Poetzl]

Hi Sam!

first, thanks for the kbuild stuff and all the 
time spent on that ... I really love it


from time to time I encounter some issue which
usually keeps me busy for a while, and I think
there probably is a simpler solution to that ...

the procedure:

I'm configuring a 2.6.X-rcY-bkZ kernel for testing
with QEMU, which in my setup basically requires
some QEMU specific settings, I usually turn on/off
by just editing the .config file by hand, and then
invoking 'make oldconfig' ...

to keep the possibility for error low, I usually
just remove the entries in question, and oldconfig
will ask me the relevant question, leading to a
nice config adapted to my purposes ...

the issue:

sometimes a dependancy doesn't allow me to remove
a config option, I absolutely have to remove for
my setup, like the VGA_CONSOLE, and then the hunt
for the option 'requiring' that one unconditinally
beginns ...

usually I start with grep and end with trial and
error, until I find the malicious dependancy ...

so, now the question:

is there a magic option, simple procedure, or just
quick and dirty hack to get a list or some kind 
of dependancy graph from the kbuild system?

TIA,
Herbert

Re: displaying kbuild dependancies ...

[Sam Ravnborg]

On Sat, Sep 11, 2004 at 10:25:48PM +0200, Herbert Poetzl wrote:
> 
> Hi Sam!
> 
> first, thanks for the kbuild stuff and all the 
> time spent on that ... I really love it
> 
> 
> from time to time I encounter some issue which
> usually keeps me busy for a while, and I think
> there probably is a simpler solution to that ...
> 
> the procedure:
> 
> I'm configuring a 2.6.X-rcY-bkZ kernel for testing
> with QEMU, which in my setup basically requires
> some QEMU specific settings, I usually turn on/off
> by just editing the .config file by hand, and then
> invoking 'make oldconfig' ...
> 
> to keep the possibility for error low, I usually
> just remove the entries in question, and oldconfig
> will ask me the relevant question, leading to a
> nice config adapted to my purposes ...
> 
> the issue:
> 
> sometimes a dependancy doesn't allow me to remove
> a config option, I absolutely have to remove for
> my setup, like the VGA_CONSOLE, and then the hunt
> for the option 'requiring' that one unconditinally
> beginns ...
> 
> usually I start with grep and end with trial and
> error, until I find the malicious dependancy ...

The only option today is to turn on the debug option
in 'make xconfig'.

I have been looking inot something better for menuconfig
but frankly kconfig is not where I feel most comfortable.

	Sam

Re: displaying kbuild dependancies ...

[Herbert Poetzl]

On Sat, Sep 11, 2004 at 11:39:31PM +0200, Sam Ravnborg wrote:
> On Sat, Sep 11, 2004 at 10:25:48PM +0200, Herbert Poetzl wrote:
> > 
> > Hi Sam!
> > 
> > first, thanks for the kbuild stuff and all the 
> > time spent on that ... I really love it
> > 
> > 
> > from time to time I encounter some issue which
> > usually keeps me busy for a while, and I think
> > there probably is a simpler solution to that ...
> > 
> > the procedure:
> > 
> > I'm configuring a 2.6.X-rcY-bkZ kernel for testing
> > with QEMU, which in my setup basically requires
> > some QEMU specific settings, I usually turn on/off
> > by just editing the .config file by hand, and then
> > invoking 'make oldconfig' ...
> > 
> > to keep the possibility for error low, I usually
> > just remove the entries in question, and oldconfig
> > will ask me the relevant question, leading to a
> > nice config adapted to my purposes ...
> > 
> > the issue:
> > 
> > sometimes a dependancy doesn't allow me to remove
> > a config option, I absolutely have to remove for
> > my setup, like the VGA_CONSOLE, and then the hunt
> > for the option 'requiring' that one unconditinally
> > beginns ...
> > 
> > usually I start with grep and end with trial and
> > error, until I find the malicious dependancy ...
> 
> The only option today is to turn on the debug option
> in 'make xconfig'.

hmm, so no luck for the typical console user  :(

> I have been looking inot something better for menuconfig
> but frankly kconfig is not where I feel most comfortable.

it would be sufficient to be able to turn on some
debug output, which says 'foo selected from bla'
or 'foo disabled, requires bla and whatnot' ...

anyway, thanks for the feedback,
Herbert

> 	Sam
> -
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Re: displaying kbuild dependancies ...

[Randy.Dunlap]

On Sun, 12 Sep 2004 23:30:34 +0200 Herbert Poetzl wrote:

| On Sat, Sep 11, 2004 at 11:39:31PM +0200, Sam Ravnborg wrote:
| > On Sat, Sep 11, 2004 at 10:25:48PM +0200, Herbert Poetzl wrote:
| > > 
| > > Hi Sam!
| > > 
| > > first, thanks for the kbuild stuff and all the 
| > > time spent on that ... I really love it
| > > 
| > > 
| > > from time to time I encounter some issue which
| > > usually keeps me busy for a while, and I think
| > > there probably is a simpler solution to that ...
| > > 
| > > the procedure:
| > > 
| > > I'm configuring a 2.6.X-rcY-bkZ kernel for testing
| > > with QEMU, which in my setup basically requires
| > > some QEMU specific settings, I usually turn on/off
| > > by just editing the .config file by hand, and then
| > > invoking 'make oldconfig' ...
| > > 
| > > to keep the possibility for error low, I usually
| > > just remove the entries in question, and oldconfig
| > > will ask me the relevant question, leading to a
| > > nice config adapted to my purposes ...
| > > 
| > > the issue:
| > > 
| > > sometimes a dependancy doesn't allow me to remove
| > > a config option, I absolutely have to remove for
| > > my setup, like the VGA_CONSOLE, and then the hunt
| > > for the option 'requiring' that one unconditinally
| > > beginns ...
| > > 
| > > usually I start with grep and end with trial and
| > > error, until I find the malicious dependancy ...
| > 
| > The only option today is to turn on the debug option
| > in 'make xconfig'.
| 
| hmm, so no luck for the typical console user  :(
| 
| > I have been looking inot something better for menuconfig
| > but frankly kconfig is not where I feel most comfortable.
| 
| it would be sufficient to be able to turn on some
| debug output, which says 'foo selected from bla'
| or 'foo disabled, requires bla and whatnot' ...

There are some menuconfig patches in -mm (from Yuval Turgeman)
that add a search option (using '/') to menuconfig.
E.g., enter / + USB_STORAGE and you can see everywhere
that USB_STORAGE is used.... and that it SELECTs SCSI.
To see only the USB_STORAGE kconfig entry, use a regex:
^USB_STORAGE$

IIRC, Yuval is considering how to enhance this feature.

--
~Randy

Re: displaying kbuild dependancies ...

[Herbert Poetzl]

On Tue, Sep 14, 2004 at 08:28:41AM -0700, Randy.Dunlap wrote:
> On Sun, 12 Sep 2004 23:30:34 +0200 Herbert Poetzl wrote:
> 
> | On Sat, Sep 11, 2004 at 11:39:31PM +0200, Sam Ravnborg wrote:
> | > On Sat, Sep 11, 2004 at 10:25:48PM +0200, Herbert Poetzl wrote:
> | > > 
> | > > Hi Sam!
> | > > 
> | > > first, thanks for the kbuild stuff and all the 
> | > > time spent on that ... I really love it
> | > > 
> | > > 
> | > > from time to time I encounter some issue which
> | > > usually keeps me busy for a while, and I think
> | > > there probably is a simpler solution to that ...
> | > > 
> | > > the procedure:
> | > > 
> | > > I'm configuring a 2.6.X-rcY-bkZ kernel for testing
> | > > with QEMU, which in my setup basically requires
> | > > some QEMU specific settings, I usually turn on/off
> | > > by just editing the .config file by hand, and then
> | > > invoking 'make oldconfig' ...
> | > > 
> | > > to keep the possibility for error low, I usually
> | > > just remove the entries in question, and oldconfig
> | > > will ask me the relevant question, leading to a
> | > > nice config adapted to my purposes ...
> | > > 
> | > > the issue:
> | > > 
> | > > sometimes a dependancy doesn't allow me to remove
> | > > a config option, I absolutely have to remove for
> | > > my setup, like the VGA_CONSOLE, and then the hunt
> | > > for the option 'requiring' that one unconditinally
> | > > beginns ...
> | > > 
> | > > usually I start with grep and end with trial and
> | > > error, until I find the malicious dependancy ...
> | > 
> | > The only option today is to turn on the debug option
> | > in 'make xconfig'.
> | 
> | hmm, so no luck for the typical console user  :(
> | 
> | > I have been looking inot something better for menuconfig
> | > but frankly kconfig is not where I feel most comfortable.
> | 
> | it would be sufficient to be able to turn on some
> | debug output, which says 'foo selected from bla'
> | or 'foo disabled, requires bla and whatnot' ...
> 
> There are some menuconfig patches in -mm (from Yuval Turgeman)
> that add a search option (using '/') to menuconfig.
> E.g., enter / + USB_STORAGE and you can see everywhere
> that USB_STORAGE is used.... and that it SELECTs SCSI.
> To see only the USB_STORAGE kconfig entry, use a regex:
> ^USB_STORAGE$

sounds great! 
will investigate this ...

> IIRC, Yuval is considering how to enhance this feature.

thanks for the info,
Herbert

> --
> ~Randy