linux-kernel - Re: [PATCH V3 13/14] LoongArch: Adjust default config files for 32BIT/64BIT

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Message-ID: <2f9f3c8f-d444-42b9-9c2f-66c8676e9565@t-8ch.de>
Date: Sat, 22 Nov 2025 13:24:50 +0100
From: Thomas Weißschuh <thomas@...ch.de>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Huacai Chen <chenhuacai@...ngson.cn>, Arnd Bergmann <arnd@...db.de>, 
	loongarch@...ts.linux.dev, linux-arch@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>, 
	Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>, 
	Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 13/14] LoongArch: Adjust default config files for
 32BIT/64BIT

On 2025-11-22 19:58:24+0800, Huacai Chen wrote:
> On Sat, Nov 22, 2025 at 5:45 PM Thomas Weißschuh <thomas@...ch.de> wrote:
> >
> > On 2025-11-22 12:36:33+0800, Huacai Chen wrote:
> > > Add loongson32_defconfig (for 32BIT) and rename loongson3_defconfig to
> > > loongson64_defconfig (for 64BIT).
> > >
> > > Also adjust graphics drivers, such as FB_EFI is replaced with EFIDRM.
> > >
> > > Reviewed-by: Arnd Bergmann <arnd@...db.de>
> > > Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> > > Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> > > ---
> > >  arch/loongarch/Makefile                       |    7 +-
> > >  arch/loongarch/configs/loongson32_defconfig   | 1104 +++++++++++++++++
> > >  ...ongson3_defconfig => loongson64_defconfig} |    6 +-
> > >  3 files changed, 1113 insertions(+), 4 deletions(-)
> > >  create mode 100644 arch/loongarch/configs/loongson32_defconfig
> > >  rename arch/loongarch/configs/{loongson3_defconfig => loongson64_defconfig} (99%)
> > >
> > > diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
> > > index 96ca1a688984..cf9373786969 100644
> > > --- a/arch/loongarch/Makefile
> > > +++ b/arch/loongarch/Makefile
> > > @@ -5,7 +5,12 @@
> > >
> > >  boot := arch/loongarch/boot
> > >
> > > -KBUILD_DEFCONFIG := loongson3_defconfig
> > > +ifdef CONFIG_32BIT
> >
> > Testing for CONFIG options here doesn't make sense, as the config is not yet
> > created. Either test for $(ARCH) or uname or just use one unconditionally.
> > Also as mentioned before, snippets can reduce the duplication.
> Thank you for your clarification. But $(ARCH) also doesn't make sense
> because it is always "loongarch".
> 
> 'uname' is an option but I think it doesn't work for cross compile?

The default is not meant to work for cross compilations. ARCH/SUBARCH
can take `uname` into account. See Makefile and scripts/subarch.include.
But as Arnd mentioned, it most probably does not make any sense to cater
to native LoongArch32 builds. Just use the 64-bit variant unconditionally.
It is easy enough to override.


Thomas