linux-kernel - Re: [PATCH v5 00/34] sparc64: vdso: Switch to the generic vDSO library

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Message-Id: <95430a56-1ee4-46e2-814e-01a8cd074a48@app.fastmail.com>
Date: Thu, 06 Nov 2025 18:20:36 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 "Andy Lutomirski" <luto@...nel.org>,
 "Thomas Gleixner" <tglx@...utronix.de>,
 "Vincenzo Frascino" <vincenzo.frascino@....com>,
 "David S . Miller" <davem@...emloft.net>,
 "Andreas Larsson" <andreas@...sler.com>,
 "Nick Alcock" <nick.alcock@...cle.com>,
 "John Stultz" <jstultz@...gle.com>, "Stephen Boyd" <sboyd@...nel.org>,
 "John Paul Adrian Glaubitz" <glaubitz@...sik.fu-berlin.de>,
 shuah <shuah@...nel.org>, "Catalin Marinas" <catalin.marinas@....com>,
 "Will Deacon" <will@...nel.org>, "Theodore Ts'o" <tytso@....edu>,
 "Jason A . Donenfeld" <Jason@...c4.com>,
 "Russell King" <linux@...linux.org.uk>,
 "Madhavan Srinivasan" <maddy@...ux.ibm.com>,
 "Michael Ellerman" <mpe@...erman.id.au>,
 "Nicholas Piggin" <npiggin@...il.com>,
 "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Huacai Chen" <chenhuacai@...nel.org>, "WANG Xuerui" <kernel@...0n.name>,
 "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
 "Heiko Carstens" <hca@...ux.ibm.com>,
 "Vasily Gorbik" <gor@...ux.ibm.com>,
 "Alexander Gordeev" <agordeev@...ux.ibm.com>,
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Cc: 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, linux-s390@...r.kernel.org,
 "Arnd Bergmann" <arnd@...nel.org>
Subject: Re: [PATCH v5 00/34] sparc64: vdso: Switch to the generic vDSO library

On Thu, Nov 6, 2025, at 11:01, Thomas Weißschuh wrote:
> The generic vDSO provides a lot common functionality shared between
> different architectures. SPARC is the last architecture not using it,
> preventing some necessary code cleanup.
>
> Make use of the generic infrastructure.
>
> Follow-up to and replacement for Arnd's SPARC vDSO removal patches:
> https://lore.kernel.org/lkml/20250707144726.4008707-1-arnd@kernel.org/
>
> SPARC64 can not map .bss into userspace, so the vDSO datapages are
> switched over to be allocated dynamically. This requires changes to the
> s390 and random subsystem vDSO initialization as preparation.
> The random subsystem changes in turn require some cleanup of the vDSO
> headers to not end up as ugly #ifdef mess.
>
> Tested on a Niagara T4 and QEMU.
>
> This has a semantic conflict with my series "vdso: Reject absolute
> relocations during build" [0]. The last patch of this series expects all
> users of the generic vDSO library to use the vdsocheck tool.
> This is not the case (yet) for SPARC64. I do have the patches for the
> integration, the specifics will depend on which series is applied first.
>
> Based on v6.18-rc1.

I had a look at this version and everything looks fine to me.

Acked-by: Bergmann <arnd@...db.de>

I see that you have sent the series 'to' a lot of people, so
I'm not sure who you expect to merge it. I assume this will all
go through the tip/timers/vdso branch, unless you need me to
pick it up through the asm-generic tree instead.

     Arnd