linux-kernel - Re: [PATCH] kconfig: fix make oldconfig

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Date:	Fri, 6 Aug 2010 11:09:41 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Michal Marek <mmarek@...e.cz>,
	"Justin P. Mattock" <justinmattock@...il.com>, JBeulich@...ell.com,
	aris@...hat.com, catalin.marinas@....com, jacmet@...site.dk,
	lizf@...fujitsu.com, ulfalizer.lkml@...il.com,
	zippel@...ux-m68k.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: fix make oldconfig

On Fri, Aug 6, 2010 at 10:52 AM, Sam Ravnborg <sam@...nborg.org> wrote:
>
> Hmm, I wonder why you call oldconfig explicitly?
>
> A plain "make -j16" executes "silentoldconfig" if there
> is any changes in a Kconfig* file or in .config.
> Just double checked and it works as I expected.
>
> So you are asked if there is any new options anyway even
> if you skip your "oldconfig" step.

Try this:

   git clean -dqfx
   make -j16 > ../makes

It doesn't work, because "make silentconfig" will say

  ***
  *** You have not yet configured your kernel!
  *** (missing kernel config file ".config")
  ***
  *** Please run some configurator (e.g. "make oldconfig" or
  *** "make menuconfig" or "make xconfig").
  ***

which is why I always run "make oldconfig".

Sure, I could do it only when I need to, but quite frankly, it's much
easier to just always do the thing that works, rather than try
something that doesn't work, do something else, and then re-try the
thing that can fail.

                     Linus
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