linux-kernel - Re: [PATCH] Fix corruption of CONFIG_X86

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Date:	Mon, 30 May 2011 12:46:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix corruption of CONFIG_X86_32 in 'make oldconfig'


* Ingo Molnar <mingo@...e.hu> wrote:

> > I believe that this 'filtered randconfig' behaviour is now fairly 
> > much the *only* use for the old 'ARCH=i386' and 'ARCH=x86_64'.
> 
> Not really, there's also:
> 
> 	make ARCH=i386   defconfig      # writes 32-bit defconfig into .config
> 	make ARCH=x86_64 defconfig      # writes 64-bit defconfig into .config
> 
> 	make ARCH=i386   oldconfig      # turns 64-bit .config int 32-bit equivalent
> 	make ARCH=x86_64 oldconfig      # turns 32-bit .config int 64-bit equivalent
> 
> And i use these variants myself, both as commands typed and in 
> scripts, in addition to the randconfig variants:
> 
> 	make ARCH=i386   randconfig     # write 32-bit randconfig into .config
> 	make ARCH=x86_64 randconfig     # write 64-bit randconfig into .config
> 
> I'm pretty sure others are relying on these variants as well - they 
> are fairly logical along several dimensions.

Not to mention all the other *config variants, which work in a 
similar fashion:

 	make ARCH=i386   allnoconfig    # writes 32-bit all-disabled config into .config
 	make ARCH=i386   allyesconfig   # writes 32-bit all-enabled  config into .config
 	make ARCH=i386   allmodconfig   # writes 32-bit all-modules  config into .config

 	make ARCH=x86_64 allnoconfig    # writes 64-bit all-disabled config into .config
 	make ARCH=x86_64 allyesconfig   # writes 64-bit all-enabled  config into .config
 	make ARCH=x86_64 allmodconfig   # writes 64-bit all-modules  config into .config

and i use them in this fashion both as typed commands and in scripts, 
and many other kernel developers are using them as well.

So contrary to your claim there's *one dozen* very useful uses of 
this 'old' form - with no functional replacement AFAICS.

Thanks,

	Ingo
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