[PATCH] kbuild: add KBUILD_DEFCONFIG

[Sascha Hauer]

On Tue, Jan 13, 2015 at 04:54:47PM +0900, Masahiro Yamada wrote:
> Hi Jean-Christophe,
> 
> On Tue, 13 Jan 2015 14:53:19 +0800
> Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com> wrote:
> 
> > 
> > > On Jan 13, 2015, at 2:46 PM, Masahiro Yamada <yamada.m at jp.panasonic.com> wrote:
> > > 
> > > This allows "make ARCH=... defconfig".
> > > 
> > > Fox example, you can type "make defconfig" instead of
> > > "make sandbox_defconfig".
> > > 
> > > Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> > > ---
> > > 
> > > arch/arm/Makefile      | 1 +
> > > arch/blackfin/Makefile | 1 +
> > > arch/efi/Makefile      | 2 ++
> > > arch/nios2/Makefile    | 2 ++
> > > arch/openrisc/Makefile | 2 ++
> > > arch/sandbox/Makefile  | 1 +
> > > arch/x86/Makefile      | 2 ++
> > > 7 files changed, 11 insertions(+)
> > > 
> > > diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> > > index f06e2a0..9dd983b 100644
> > > --- a/arch/arm/Makefile
> > > +++ b/arch/arm/Makefile
> > > @@ -1,3 +1,4 @@
> > > +KBUILD_DEFCONFIG := versatilepb_defconfig
> > 
> > no sure we need a default config on arm and some other
> > 
> > I known we use them on the kernel but here it could result in a broken board
> > if use not carefully
> > 
> > for arch that only have 1 defconfig and will only have one maybe
> > 
> 
> Why could it result in a broken board?  (It seems harmless to me.)
> 
> I think it is useful at least for Sandbox and some other arches that
> have only "generic_defconfig".
> 
> It is true that KBUILD_DEFCONFIG is not so useful for ARM.
> If it is not desired for ARM (and Blackfin), we can drop it, of course.

I think it makes sense on EFI, x86 and sandbox. On the other
architectures one must know which board to build, so let's do not
get others the impression that the generic defconfig produces something
useful. This also includes nios2 and openrisc. For these two only
one defconfig exists but I think this is more because these
architectures have very limited usage.

Sascha

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