Re: [PATCH 2/2] x86: Add "make tinyconfig" to configure the tiniest possible kernel

From: David Rientjes
Date: Wed Aug 06 2014 - 18:39:03 EST


On Wed, 6 Aug 2014, Josh Triplett wrote:

> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index 1568678..2b5ca16 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -257,6 +257,10 @@ PHONY += kvmconfig
> kvmconfig:
> $(call mergeconfig,kvm_guest)
>
> +PHONY += tinyconfig
> +tinyconfig: allnoconfig

Calling allnoconfig here makes "make tinyconfig" default to CONFIG_X86_32
even on 64 bit platforms and the caller would need to explicitly do
"make ARCH=x86_64 tinyconfig" to avoid it. It's not clear that this is
intended from the documentation of tinyconfig, that tiniest == 32 bit by
default.

> + $(call mergeconfig,tiny)
> +
> define archhelp
> echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
> echo ' install - Install kernel using'
> @@ -271,4 +275,5 @@ define archhelp
> echo ' FDARGS="..." arguments for the booted kernel'
> echo ' FDINITRD=file initrd for the booted kernel'
> echo ' kvmconfig - Enable additional options for guest kernel support'
> + echo ' tinyconfig - Configure the tiniest possible kernel'
> endef
> diff --git a/arch/x86/configs/tiny.config b/arch/x86/configs/tiny.config
> new file mode 100644
> index 0000000..8f0e54c
> --- /dev/null
> +++ b/arch/x86/configs/tiny.config
> @@ -0,0 +1,5 @@
> +CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> +CONFIG_KERNEL_XZ=y
> +CONFIG_NOHIGHMEM=y
> +CONFIG_OPTIMIZE_INLINING=y
> +CONFIG_SLOB=y
--
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