linux-kernel - Re: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP

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Date:   Wed, 8 Feb 2023 16:39:44 +0000
From:   Mark Brown <broonie@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Nadav Amit <namit@...are.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <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,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH mm-unstable v1 04/26] arm/mm: support
 __HAVE_ARCH_PTE_SWP_EXCLUSIVE

On Wed, Feb 08, 2023 at 03:12:06PM +0100, David Hildenbrand wrote:
> On 07.02.23 01:32, Mark Brown wrote:

> > Today's -next (and at least back to Friday, older logs are unclear - I
> > only noticed -next issues today) fails to NFS boot on an AT91SAM9G20-EK
> > (an old ARMv5 platform) with multi_v5_defconfig, a bisect appears to
> > point to this patch (20aae9eff5acd8f5 in today's -next) as the culprit.

> It's been in -next for quite a while, thanks for the report!

Yeah, there's been some other things obscuring the issue.

> Could you give the following a test?
> 
> 
> From 8c4bdbd9862f85782d5919d044c172b584063e83 Mon Sep 17 00:00:00 2001
> From: David Hildenbrand <david@...hat.com>
> Date: Wed, 8 Feb 2023 15:08:01 +0100
> Subject: [PATCH] arm/mm: Fix swp type masking in __swp_entry()
> 
> We're masking with the number of type bits instead of the type mask, which
> is obviously wrong.

Tested-by: Mark Brown <broonie@...nel.org>

but note that I had to manually apply it, though it's pretty trivial so
I probably applied the right thing.

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