linux-kernel - Re: [PATCH V3 15/17] riscv: compat: Add UXL_32 support in start

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Message-ID: <CAJF2gTTGD_Ks2pO4jXx+QbiLV4nkjzk6mP-xKJOCvHtGTeFfOQ@mail.gmail.com>
Date:   Thu, 20 Jan 2022 21:43:03 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Anup Patel <anup@...infault.org>,
        gregkh <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>,
        Christoph Hellwig <hch@...radead.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>,
        inux-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 V3 15/17] riscv: compat: Add UXL_32 support in start_thread

On Thu, Jan 20, 2022 at 9:39 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Thu, Jan 20, 2022 at 8:39 AM <guoren@...nel.org> wrote:
> > +
> > +#ifdef CONFIG_COMPAT
> > +       if (is_compat_task())
> > +               regs->status |= SR_UXL_32;
> > +#endif
>
>
> You should not need that #ifdef, as the is_compat_task() definition is
> meant to drop the code at compile time, unless the SR_UXL_32
> definition is not visible here.
I almost put CONFIG_COMPAT in every compat related code, because I
hope the next arch that wants to support COMPAT could easily find
where to be modified.

>
>          Arnd



-- 
Best Regards
 Guo Ren

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