Re: [PATCH mm-unstable v1 19/26] riscv/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

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To: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Subject: Re: [PATCH mm-unstable v1 19/26] riscv/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue, 28 Feb 2023 16:56:30 +0100
Cc: linux-kernel@xxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, hughd@xxxxxxxxxx, jhubbard@xxxxxxxxxx, jgg@xxxxxxxxxx, rppt@xxxxxxxxxxxxx, shy828301@xxxxxxxxx, vbabka@xxxxxxx, namit@xxxxxxxxxx, aarcange@xxxxxxxxxx, peterx@xxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-csky@xxxxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, loongarch@xxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, openrisc@xxxxxxxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-um@xxxxxxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, aou@xxxxxxxxxxxxxxxxx
In-reply-to: <mhng-b8dc8a57-dde0-4995-bbb7-3948a95ba0b1@palmer-ri-x1c9a>
Organization: Red Hat
References: <mhng-b8dc8a57-dde0-4995-bbb7-3948a95ba0b1@palmer-ri-x1c9a>
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On 28.02.23 16:50, Palmer Dabbelt wrote:

On Fri, 13 Jan 2023 09:10:19 PST (-0800), david@xxxxxxxxxx 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. Thanksfor the review!


--
Thanks,

David / dhildenb

References:
- Re: [PATCH mm-unstable v1 19/26] riscv/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
  - From: Palmer Dabbelt

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