linux-kernel - Re: [PATCH 02/13] riscv: Fixup difference with defconfig

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Message-ID: <CAJF2gTQEp0hEousuEyp5cPCa5Remb_8HMZ-BXZ393_z7hbne7g@mail.gmail.com>
Date:   Wed, 22 Dec 2021 21:06:37 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Anup Patel <anup.patel@....com>,
        gregkh <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH 02/13] riscv: Fixup difference with defconfig

On Wed, Dec 22, 2021 at 8:51 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Wed, Dec 22, 2021 at 12:34 PM Guo Ren <guoren@...nel.org> wrote:
> > On Wed, Dec 22, 2021 at 1:09 AM Arnd Bergmann <arnd@...db.de> wrote:
> > > On Tue, Dec 21, 2021 at 5:35 PM <guoren@...nel.org> wrote:
> > > If the intention is to keep them in sync, maybe use a fragment for 32-bit
> > > mode, like powerpc or mips do.
> >
> > Some people are familiar with "make rv32_defconfig". There has a
> > 32-bit.config fragment config in arch/riscv/configs/.
> >
> > I've tested with:
> >
> > make ARCH=riscv CROSS_COMPILE=riscv32-buildroot-linux-gnu-
> > EXTRA_CFLAGS+=-g O=../build-rv32/ defconfig 32-bit.config
> >
> > The above is tested Okay, do you mean we should delete rv32_defconfig?
> > I think it's another topic, I just want them the same in "compat"
> > patchset.
>
> I think what you can do is to add rv32_defconfig as a target in
> arch/riscv/Makefile the same way as rv32_randconfig, and then
> delete the other file, that will keep the existing process working
> for any existing users.
Good idea, I would try.

>
> Given that there are no specific rv32 SoC implementations supported
> by the kernel today (other than SOC_VIRT), the number of users
> would be close to zero anyway.
I really agree with you, but we still need the rv32 user mode
ecosystem for memory footprint.

>
>        Arnd



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/