linux-kernel - Re: [PATCH V4 16/17] riscv: compat: Add COMPAT Kbuild skeletal support

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Message-ID: <CAJF2gTRXDotO1L1FMojQs6msrqvCzA782Pux8rg3AfZgA=y0ew@mail.gmail.com>
Date:   Mon, 31 Jan 2022 21:50:58 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>, Arnd Bergmann <arnd@...db.de>,
        Anup Patel <anup@...infault.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Christoph Hellwig <hch@....de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V4 16/17] riscv: compat: Add COMPAT Kbuild skeletal support

On Mon, Jan 31, 2022 at 8:26 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> Given that most rv64 implementations can't run in rv32 mode, what is the
> failure mode if someone tries it with the compat mode enabled?
A static linked simple hello_world could still run on a non-compat
support hardware. But most rv32 apps would meet different userspace
segment faults.

Current code would let the machine try the rv32 apps without detecting
whether hw support or not.


-- 
Best Regards
 Guo Ren

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