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

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Date:	Sat, 7 Jun 2014 02:11:32 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	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 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)'
--
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