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

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Message-ID: <alpine.DEB.2.02.1408061637110.13545@chino.kir.corp.google.com>
Date:	Wed, 6 Aug 2014 16:37:54 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Josh Triplett <josh@...htriplett.org>
cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: Add "make tinyconfig" to configure the tiniest
 possible kernel

On Wed, 6 Aug 2014, Josh Triplett wrote:

> On Wed, Aug 06, 2014 at 03:38:56PM -0700, David Rientjes wrote:
> > 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.
> 
> Calling allnoconfig was quite intentional; this is intended to be the
> smallest possible configuration, and unlike kvmconfig (which modifies an
> existing configuration to make it suitable for a KVM guest), this
> intentionally creates a specific new configuration from scratch.
> 
> 32-bit produces a far smaller kernel than 64-bit, so having that as the
> default for tinyconfig seems quite appropriate.  As you showed, it's
> easy enough to override it if needed.  I'd expect many potential users
> of tinyconfig for embedded systems to start with tinyconfig and then
> immediately use menuconfig to enable a pile of additional options.
> 

In that case, any reason to make tinyconfig x86 only?
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