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

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Date:   Thu, 20 Jan 2022 15:46:18 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Arnd Bergmann' <arnd@...db.de>, Guo Ren <guoren@...nel.org>
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-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" <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

...
> One example of software that runs into virtual memory size limitations is
> the gnu linker when building large applications, but it's unlikely that you'll
> actually need to run applications that run into this, while also needing to
> build them natively.

There are also database programs that want to mmap() large sparse files.
To some extent that is where the pressure for 64bit addresses comes from.

While (I think) most of the current riscv systems are 'toy' ones
there are definitely press reports of some quite high power systems.

I suspect they are less 'toy' than the Altera (Intel) Nios processors
we use on out fpga - you can run linux on the Nios cpu, but you probably
don't really want to do so.
Better to find an fpga with a 'proper' ARM core in the corner.

	David

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