Re: [PATCH] kernel: use oldnoconfig instead of yes '' | make oldconfig

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 07/01/2014 15:35, Martin Jansa wrote:
> On Tue, Jan 07, 2014 at 03:18:37PM +0100, Alexandre Belloni wrote:
>> When using a defconfig, using yes '' | make oldconfig may not result in
>> the correct configuration being set. For example:
> 
>>  $ grep USB_ETH .config
>>  CONFIG_USB_ETH=y
>>  CONFIG_USB_ETH_RNDIS=y
>>  CONFIG_USB_ETH_EEM=y
>>  $ make savedefconfig
>>  scripts/kconfig/conf --savedefconfig=defconfig Kconfig
>>  $ cp defconfig .config
>>  ‘defconfig’ -> ‘.config’
>>  $ yes '' | make oldconfig
>>  [...]
>>  #
>>  # configuration written to .config
>>  #
>>  $ grep USB_ETH .config
>>  CONFIG_USB_ETH=m
>>  CONFIG_USB_ETH_RNDIS=y
>>  CONFIG_USB_ETH_EEM=y
>>
>> Using make olddefconfig solves that but we'll use oldnoconfig for
>> backward compatibility with older kernels.
> 
> Looks good, I have few kernel recipes where I had to fixup resulting
> .config after "make savedefconfig", "yes '' | make oldconfig" combo
> exactly because of some =y changing to -m.
> 
> 1) Do you know since when oldnoconfig is supported?
> 
> IIRC oldest kernel I've in BSPs is 2.6.24. 

oldnoconfig seems to be present since 2.6.36. olddefconfig is an alias
that appeared with fb16d8912db5268f29706010ecafff74b971c58d which is
present since v3.7.

Then hat about using:

oe_runmake oldnoconfig || yes '' | oe_runmake oldconfig

> 
> 2) Could you send similar patch for
> meta-openembedded/meta-oe/recipes-kernel/linux/linux.inc
> ?
> 

Sure, will do once we agreed on this patch



-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com