linux-kernel - Re: [PATCH V5 15/21] riscv: compat: Add hw capability check for elf

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Date:   Thu, 3 Feb 2022 10:44:00 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@....de>
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>,
        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 V5 15/21] riscv: compat: Add hw capability check for elf

On Wed, Feb 2, 2022 at 3:52 PM Christoph Hellwig <hch@....de> wrote:
>
> On Tue, Feb 01, 2022 at 11:05:39PM +0800, guoren@...nel.org wrote:
> > +bool compat_elf_check_arch(Elf32_Ehdr *hdr)
> > +{
> > +     if (compat_mode_support && (hdr->e_machine == EM_RISCV))
> > +             return true;
> > +     else
> > +             return false;
> > +}
>
> This can be simplified to:
>
>         return compat_mode_support && hdr->e_machine == EM_RISCV;
Good point.

>
> I'd also rename compat_mode_support to compat_mode_supported
Okay

>
> > +
> > +static int compat_mode_detect(void)
> > +{
> > +     unsigned long tmp = csr_read(CSR_STATUS);
> > +
> > +     csr_write(CSR_STATUS, (tmp & ~SR_UXL) | SR_UXL_32);
> > +
> > +     if ((csr_read(CSR_STATUS) & SR_UXL) != SR_UXL_32) {
> > +             pr_info("riscv: 32bit compat mode detect failed\n");
> > +             compat_mode_support = false;
> > +     } else {
> > +             compat_mode_support = true;
> > +             pr_info("riscv: 32bit compat mode detected\n");
> > +     }
>
> I don't think we need these printks here.
Okay

>
> Also this could be simplified to:
>
>         compat_mode_supported = (csr_read(CSR_STATUS) & SR_UXL) == SR_UXL_32;
Okay



-- 
Best Regards
 Guo Ren

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