linux-kernel - Re: [PATCH V3 10/17] riscv: compat: Add elf.h implementation

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Message-ID: <CAK8P3a2HaeFGdOr4Rm_ZcEP0rjh2Mo53=-ZRnEPtFfnmzfeE6g@mail.gmail.com>
Date:   Thu, 20 Jan 2022 10:36:13 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>, Arnd Bergmann <arnd@...db.de>,
        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 10/17] riscv: compat: Add elf.h implementation

On Thu, Jan 20, 2022 at 8:39 AM <guoren@...nel.org> wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> Implement necessary type and macro for compat elf. See the code
> comment for detail.
>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>

Reviewed-by: Arnd Bergmann <arnd@...db.de>

> +
> +/*
> + * FIXME: not sure SET_PERSONALITY for compat process is right!
> + */
> +#define SET_PERSONALITY(ex)                                    \
> +do {    if ((ex).e_ident[EI_CLASS] == ELFCLASS32)              \
> +               set_thread_flag(TIF_32BIT);                     \
> +       else                                                    \
> +               clear_thread_flag(TIF_32BIT);                   \
> +       if (personality(current->personality) != PER_LINUX32)   \
> +               set_personality(PER_LINUX |                     \
> +                       (current->personality & (~PER_MASK)));  \
> +} while (0)
> +

The implementation looks good to me now,  you can remove that comment above it.

        Arnd