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Tanstaafl 03-06-2010 06:21 PM

Kernel 2.6.31-r6 - where is hot-pluggable device support for udev?
 
Hello,

The Gentoo udev guide (http://www.gentoo.org/doc/en/udev-guide.xml) says
specifically to make sure that:

'General setup --->[*] Support for hot-pluggable devices'

is enabled, but I didn't have this option available (the others were
already enabled) when I did 'make menuconfig'.

I did find it (or one named the same) under:

'Configure standard kernel features (for small systems) --->'

But when that is enabled, 'Namespaces support' is automatically disabled.

So, which do I want? Is the udev guide outdated and/or did this change
for newer kernels?

Thanks,

--

Charles

Florian Philipp 03-07-2010 01:14 PM

Kernel 2.6.31-r6 - where is hot-pluggable device support for udev?
 
Tanstaafl schrieb:
> Hello,
>
> The Gentoo udev guide (http://www.gentoo.org/doc/en/udev-guide.xml) says
> specifically to make sure that:
>
> 'General setup --->
>[*] Support for hot-pluggable devices'
>
> is enabled, but I didn't have this option available (the others were
> already enabled) when I did 'make menuconfig'.
>
> I did find it (or one named the same) under:
>
> 'Configure standard kernel features (for small systems) --->'
>
> But when that is enabled, 'Namespaces support' is automatically disabled.
>
> So, which do I want? Is the udev guide outdated and/or did this change
> for newer kernels?
>
> Thanks,
>

I cannot reproduce the deactivation of 'Namespaces support' by simply
activating 'Support for hot-pluggable devices' here
(2.6.31-tuxonice-r7). In any case, you won't need Namespaces.

Please also file a bug about this little documentation issue.

Regards,
Florian Philipp

Tanstaafl 03-08-2010 11:52 AM

Kernel 2.6.31-r6 - where is hot-pluggable device support for udev?
 
On 2010-03-07 9:14 AM, Florian Philipp wrote:
> Tanstaafl schrieb:
>> The Gentoo udev guide (http://www.gentoo.org/doc/en/udev-guide.xml) says
>> specifically to make sure that:
>>
>> 'General setup --->
>>[*] Support for hot-pluggable devices'
>>
>> is enabled, but I didn't have this option available (the others were
>> already enabled) when I did 'make menuconfig'.
>>
>> I did find it (or one named the same) under:
>>
>> 'Configure standard kernel features (for small systems) --->'
>>
>> But when that is enabled, 'Namespaces support' is automatically disabled.

> I cannot reproduce the deactivation of 'Namespaces support' by simply
> activating 'Support for hot-pluggable devices' here
> (2.6.31-tuxonice-r7). In any case, you won't need Namespaces.

I always copy my old .config from my previous kernel and run make
menuconfig, so the new kernel will inherit all identical options from
the previous kernel, leaving only new/changed ones to be verified.

This new kernel had 'Namespaces support' enabled and 'Configure standard
kernel features (for smaller systems) disabled by default.

The 'Support for hot-pluggable devices' - along with a bunch of others,
*all marked (NEW)* (presumable because they've been moved?) - was a
*sub* option under the main option 'Configure standard kernel features
(for smaller systems)', which was *disabled* by default, and the first
time I enabled this, the 'Namespaces support' option was automatically
disabled - however I could re-enable it and 'configure standard...'
stayed enabled.

I'm not comfortable at all in kernel land and don't make changes
lightly, relying heavily on guides, google and the knowledge of others,
so I was concerned because usually when something is enabled by default
in a kernel, it is for a reason.

Also - the '(for smaller systems)' is similar to the 'for embedded
systems' reference, which contributed to my doubt...

> Please also file a bug about this little documentation issue.

Done: http://bugs.gentoo.org/show_bug.cgi?id=308453

Thanks,

--

Charles


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