Re: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

[Mark Brown <broonie@xxxxxxxxxx>]

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@xxxxxxxxxx>
> 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@xxxxxxxxxx>

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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