linux-kernel - Re: [PATCH v2 08/13] sparc64: vdso: Switch to the generic vDSO library

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Message-ID: <1019a5f6d0d097beb15f70acfd695d5add4d6582.camel@physik.fu-berlin.de>
Date: Fri, 29 Aug 2025 17:44:30 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Andreas Larsson <andreas@...sler.com>, Thomas
 Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
  Vincenzo Frascino <vincenzo.frascino@....com>, Arnd Bergmann
 <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>,  Nagarathnam
 Muthusamy <nagarathnam.muthusamy@...cle.com>, Nick Alcock
 <nick.alcock@...cle.com>, John Stultz <jstultz@...gle.com>,  Stephen Boyd
 <sboyd@...nel.org>, linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 08/13] sparc64: vdso: Switch to the generic vDSO
 library

Hi Andreas,

On Fri, 2025-08-29 at 15:41 +0200, Andreas Larsson wrote:
> I based my config on the SMP config that was in use on the system.
> Produces an tremendous amount of modules unfortunately, so I'll have
> to cut down in the config. Right now the turnaround time for testing
> a new kernel with this setup for this system is quite bad.

You can just use sparc64_defconfig, just make sure you enable support
for CGroups, Sun Partition tables and the Sun virtual disk and console
drivers as well as hypervisor support.

Also, make sure to disable kernel debugging support unless you need it.

> 
> > * Which toolchain are you using?
> 
> A toolchain built in Buildroot with GCC 13.2.0. Old kernel headers, but
> I only use it to build kernels. Do you think the kernel headers of the
> toolchain would play a role for vDSO?

FWIW, the latest toolchain is always available from kernel.org:

https://mirrors.edge.kernel.org/pub/tools/crosstool/

> > * This is a 64-bit userland?
> 
> Yes.

Most if not all SPARC-V9-compatible distributions use a 64-bit userland these days.

> 
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913