linux-kernel - Re: [PATCH mm-unstable v1 19/26] riscv/mm: support __HAVE_ARCH_PTE_SWP

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Message-ID: <bd656b2c-9a20-dea9-dcef-9cc965bccc9e@redhat.com>
Date:   Tue, 28 Feb 2023 16:56:30 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        hughd@...gle.com, jhubbard@...dia.com, jgg@...dia.com,
        rppt@...ux.ibm.com, shy828301@...il.com, vbabka@...e.cz,
        namit@...are.com, aarcange@...hat.com, peterx@...hat.com,
        linux-mm@...ck.org, x86@...nel.org, linux-alpha@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu
Subject: Re: [PATCH mm-unstable v1 19/26] riscv/mm: support
 __HAVE_ARCH_PTE_SWP_EXCLUSIVE

On 28.02.23 16:50, Palmer Dabbelt wrote:
> On Fri, 13 Jan 2023 09:10:19 PST (-0800), david@...hat.com wrote:
>> Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit
>> from the offset. This reduces the maximum swap space per file: on 32bit
>> to 16 GiB (was 32 GiB).
> 
> Seems fine to me, I doubt anyone wants a huge pile of swap on rv32.

Patch is already upstream, so we can't add tags unfortunately. Thanks 
for the review!

-- 
Thanks,

David / dhildenb