Re: [PATCH 7/8] kern-tools: flexibility and usability enhancements

[Darren Hart <dvhart@linux.intel.com>]

On 11/14/2012 08:58 AM, Bruce Ashfield wrote:
> On 12-11-14 11:33 AM, Darren Hart wrote:
>>
>>
>> On 11/14/2012 07:03 AM, Bruce Ashfield wrote:
>>> Updating the SRCREV to import the following changes.
>>>
>>>   [updateme: find the board description with the highest score]
>>>
>>>     This removes the requirement that a custom linux-yocto .scc file have
>>>     define KTYPE <foo>, where <foo> is typically "standard". The tools can
>>>     now match on a .scc file that only matches the board, but will still
>>>     chose one that matches the board and kernel type, if available.
>>
>> Should the documentation then state that KTYPE is only necessary to
>> define if it is not "standard" ? Does this also apply to
> 
> Nope. That isn't the intention. If you are using kernel types at all,
> you should define one. Whether it be standard or not.
> 
>> linux-yocto-custom recipes/kernels where the repository could very well
>> not define any ktype at all?
> 
> Same as the above. If you are create kernel .scc files to work with
> linux-yocto custom, you are now free to use kernel types, or not, your
> choice.

And what happens if they don't? It will just match on KMACHINE? Making
it so you can define one defconfig per machine and be done with it?
(if that's what you really wanted to do).


> 
>>
>>>
>>>   [updateme: allow for tabs or spaces in defines]
>>>
>>>     define KMACHINE<tab>$MACHINE was missed by the regex.
>>>
>>>   [scc/kgit-meta: detect and avoid duplicating patching]
>>>
>>>     To allow feature description to be included multiple times, they were
>>>     previously split into -enable and 'patch' descriptions. With this change
>>>     the patches will be detected as already included, and skipped
>>>     automatically. Removing the need to do this split. It also cleans up
>>>     the ability to warn about multiple includes.
>>>
>>>   [kconf_check: add "verify" configuration fragment type]
>>>
>>>     This adds the ability for a BSP to have a kernel configuration
>>>     fragment that lists options that must be present. If they are not
>>>     present it is a hard error. "required" is a similar fragment, but
>>>     it adds them to the build, and audits them at the end, but does
>>>     not abort the build if they are present. This is a minor distinction,
>>>     but one that is useful when creating flexible, shared kernel config
>>>     structures.
>>
>>
>> IIRC we discussed this verify thing at ELCE and how it broke some of the
>> semantics.... trying to remember now, let's see:
>>
>> kconf hardware foo.cfg
>> kconf verify hardware bar.cfg
>> kconf non-hardware foobar.cfg
>> kconf verify non-hardware barfoo.cfg
>>
>> Is that how this is to be used? The configuration space just doubled
>> from a documentation point of view, and that is without even considering
>> the "required" keyword you described.
> 
> I'll continue to work on this for 1.4, but I didn't want to pend the
> series on anything that we discussed in Barcelona .. these have been
> around for some time and I wanted to push them out before doing any 1.4
> tweaks.
> 
> But to answer your question. You could have multiple 'verify' fragments,
> but I'd only suggest one. It's a final check that critical options are
> in the final .config and will throw a hard error. required is an
> alias for 'hardware' and still only throws a warning if they are missing.
> 
> There few current users of 'verify', so I can still follow up with
> syntax tweaks that we discussed (do you have notes on that ?). I recall
> simply making 'verify' a modifier of the existing kconf types would be
> better than the current new type. I'll keep all the variants around, since
> the plumbing is the same and that will again give time for migration.
> 
> We could argue that required should also be a hard error, but we can't
> do that quite yet, since there are some existing use cases and trees
> that will start to error out, and I'd like to migrate them first.


I don't seem to have any notes on this for some reason. I'm wondering if
instead of modifiers, these should just be kconf types:

non-hardware
hardware
required
verify

As you said, required is an alias to hardware, so it isn't really a
modifier. And verify is less of a modifier and more of a verification
step, so it doesn't matter if it's hardware or non-hardware.

This would reduce the config space from 6 to 4, not a huge savings,
but it would be much simpler to document.

I'm going to omit these from the docs for now though.

> 
>>
>> Can you use required with verify? Can you use both of them with both
>> hardware and non-hardware?
> 
> Any combination at all should work.
> 
> Cheers,
> 
> Bruce
> 
>>
>>
>>>
>>>   [kconf_check: improve kernel audit report formatting]
>>>   [kconf_check: perform validity checks on non-hardware options]
>>>   [kconf_check: cleanups and verbose flag]
>>>
>>>     The existing output was verbose and not always useful to the reader.
>>>     This change makes the output more compact, audits non-hardware options
>>>     and gives information
>>>
>>>       [invalid (54)]: meta/cfg/preempt-rt/common-pc/invalid.cfg
>>>          This BSP sets config options that are not offered anywhere within this kernel
>>>
>>> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
>>> ---
>>>   meta/recipes-kernel/kern-tools/kern-tools-native_git.bb |    2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/meta/recipes-kernel/kern-tools/kern-tools-native_git.bb b/meta/recipes-kernel/kern-tools/kern-tools-native_git.bb
>>> index ce94885..f2cd39f 100644
>>> --- a/meta/recipes-kernel/kern-tools/kern-tools-native_git.bb
>>> +++ b/meta/recipes-kernel/kern-tools/kern-tools-native_git.bb
>>> @@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://git/tools/kgit;beginline=5;endline=9;md5=d8d1d729a70c
>>>
>>>   DEPENDS = "git-native guilt-native"
>>>
>>> -SRCREV = "a802ee9c8d9334c0f7932dfd40d45599addb7c90"
>>> +SRCREV = "6f68c9473b43c3e39755a72aef8733cbd0bf1a59"
>>>   PR = "r12"
>>>   PV = "0.1+git${SRCPV}"
>>>
>>>
>>
> 

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Technical Lead - Linux Kernel