linux-kernel - Re: [PATCH 2/3] x86, platform, xen, kconfig: add xen defconfig helper

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Date:	Mon, 9 Jun 2014 19:38:36 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, Borislav Petkov <bp@...e.de>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Marek <mmarek@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>, levinsasha928@...il.com,
	mtosatti@...hat.com, fengguang.wu@...el.com,
	David Vrabel <david.vrabel@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 2/3] x86, platform, xen, kconfig: add xen defconfig
	helper

On Sat, Jun 07, 2014 at 02:11:32AM -0700, David Rientjes wrote:
> On Fri, 6 Jun 2014, Luis R. Rodriguez wrote:
> 
> > diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> > index 37621ac..9db34e2 100644
> > --- a/arch/x86/Makefile
> > +++ b/arch/x86/Makefile
> > @@ -256,6 +256,12 @@ kvmconfig:
> >  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
> >  	$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
> >  
> > +PHONY += xenconfig
> > +xenconfig:
> > +	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
> > +	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/xen.config
> > +	$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
> > +
> >  define archhelp
> >    echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
> >    echo  '  install      - Install kernel using'
> > @@ -270,4 +276,5 @@ define archhelp
> >    echo  '                  FDARGS="..."  arguments for the booted kernel'
> >    echo  '                  FDINITRD=file initrd for the booted kernel'
> >    echo  '  kvmconfig	- Enable additional options for kvm guest kernel support'
> > +  echo  '  xenconfig    - Enable additional options for xen dom0 and guest kernel support'
> >  endef
> 
> I suppose it would be easier to generalize the functionality and do 
> something like this instead since the two are otherwise identical:
> 
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -250,11 +250,19 @@ archclean:
>  	$(Q)$(MAKE) $(clean)=$(boot)
>  	$(Q)$(MAKE) $(clean)=arch/x86/tools
>  
> +define build-virtconfig
> +$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
> +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/$(1)
> +$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
> +endef
> +
>  PHONY += kvmconfig
>  kvmconfig:
> -	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
> -	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
> -	$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
> +	$(call build-virtconfig,kvm_guest.config)
> +
> +PHONY += xenconfig
> +xenconfig:
> +	$(call build-virtconfig,xen.config)
>  
>  define archhelp
>    echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
> 

Good idea, I've folded this as a first patch then and will resubmit, dropping
the virtconfig kconfig option.

  Luis
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