linux-kernel - Re: [PATCH V3 07/17] riscv: compat: Re-implement TASK_SIZE for COMPAT

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Date:   Thu, 20 Jan 2022 10:31:09 +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 07/17] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT

On Thu, Jan 20, 2022 at 8:39 AM <guoren@...nel.org> wrote:
>
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> Make TASK_SIZE from const to dynamic detect TIF_32BIT flag
> function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for
> efi-stub.
>
> Limit 32-bit compatible process in 0-2GB virtual address range
> (which is enough for real scenarios), because it could avoid
> address sign extend problem when 32-bit enter 64-bit and ease
> software design.
>
> The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and
> compared to a compatible 32-bit, it increases 476MB for the
> application's virtual address.
>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>

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