linux-kernel - Re: [PATCH v4 23/35] vdso/datastore: Map pages through struct page

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Message-ID: <87bjljw1ra.ffs@tglx>
Date: Mon, 03 Nov 2025 16:54:01 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Mark Brown <broonie@...nel.org>, Thomas Weißschuh
 <thomas.weissschuh@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>, Vincenzo Frascino
 <vincenzo.frascino@....com>, Arnd Bergmann <arnd@...db.de>, "David S.
 Miller" <davem@...emloft.net>, Andreas Larsson <andreas@...sler.com>, Nick
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 Boyd <sboyd@...nel.org>, John Paul Adrian Glaubitz
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 Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Theodore
 Ts'o <tytso@....edu>, "Jason A. Donenfeld" <Jason@...c4.com>, Russell King
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 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
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 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, Shannon Nelson
 <sln@...main.com>, linux-kernel@...r.kernel.org,
 sparclinux@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
 loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
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Subject: Re: [PATCH v4 23/35] vdso/datastore: Map pages through struct page

On Mon, Nov 03 2025 at 15:24, Mark Brown wrote:
> On Tue, Oct 14, 2025 at 08:49:09AM +0200, Thomas Weißschuh wrote:
>
>> An upcoming change will allocate the datapages dynamically instead of as
>> part of the kernel image. Such pages can only be mapped through
>> 'struct page' and not through PFNs.
>
> I'm seeing some boot failures on some arm64 platforms in -next which are
> bisecting to this patch in -next.  Unfortunately the diagnostics aren't
> super useful, we seem to just stop making progress in userspace with no
> obvious output.  One sample log from the FVP is:
>
>    https://lava.sirena.org.uk/scheduler/job/2036229#L1268
>
> which isn't super instructive.  Not all platforms seem to be affected,
> I've seen this on at least the Arm FVP, Orion O6 and Libretech Renegade
> Elite.  The diagnostics aren't very clear here but given that I'm seeing
> the same issue and bisect result on multiple platforms it seemed worth
> mentioning.  Some platforms do seem fine.

Can you try

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso

which is rc1 based and only contains the VDSO changes. That might give
us a better hint.

Thanks,

        tglx