[OE-core] [PATCH][master-next] kernel: change default kconfig mode to olddefconfig

[Bruce Ashfield]

On 2018-10-29 9:02 PM, Andre McCurdy wrote:
> On Mon, Oct 29, 2018 at 11:13 AM Bruce Ashfield
> <bruce.ashfield at windriver.com> wrote:
>>
>> As was warned by commit 312ee68752fa ("kconfig: announce removal
>> of oldnoconfig if used"), it has been removed from the 4.20 kernel.
>>
>> So we switch our default mode to the proper olddefconfig
> 
> Mentioning which kernel version first introduced olddefconfig would be
> useful information here as kernels prior to that version will now fail
> to build. It looks like the patch was first proposed sometime around
> 2012:
> 
>    https://patchwork.kernel.org/patch/1394011/
> 
> We may also need to either add a fallback to use oldnoconfig or bump
> OLDEST_KERNEL (it's currently 3.2.0, which was released in early 2012
> and so probably predates olddefconfig).

We've covered this a few times in the past, and yah, we could
put a fallback into the command.

I'll spin out a v2 that adds a fallback like we used to have,
except now with the oldnoconfig as the 2nd option.

Bruce

> 
>> Signed-off-by: Bruce Ashfield <bruce.ashfield at windriver.com>
>> ---
>>
>> Not for the release, just wanted to get this in the queue for
>> when master reopens so we'll be ready for 4.20+ kernel versions
>>
>> Bruce
>>
>>   meta/classes/kernel.bbclass | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
>> index e04d2fe00434..d50f4a9ee822 100644
>> --- a/meta/classes/kernel.bbclass
>> +++ b/meta/classes/kernel.bbclass
>> @@ -492,7 +492,7 @@ sysroot_stage_all () {
>>          :
>>   }
>>
>> -KERNEL_CONFIG_COMMAND ?= "oe_runmake_call -C ${S} CC="${KERNEL_CC}" O=${B} oldnoconfig"
>> +KERNEL_CONFIG_COMMAND ?= "oe_runmake_call -C ${S} CC="${KERNEL_CC}" O=${B} olddefconfig"
>>
>>   python check_oldest_kernel() {
>>       oldest_kernel = d.getVar('OLDEST_KERNEL')
>> --
>> 2.5.0
>>
>> --
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