linux-kernel - Re: [PATCH 10/11] vdso: Drop kconfig GENERIC_VDSO_TIME

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Message-ID: <aK4MTxWGoe461HGb@arm.com>
Date: Tue, 26 Aug 2025 20:34:39 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Nam Cao <namcao@...utronix.de>,
	Russell King <linux@...linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Will Deacon <will@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>,
	Christian Brauner <brauner@...nel.org>,
	Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH 10/11] vdso: Drop kconfig GENERIC_VDSO_TIME_NS

On Tue, Aug 26, 2025 at 08:17:13AM +0200, Thomas Weißschuh wrote:
> All architectures implementing time-related functionality in the vDSO are
> using the generic vDSO library which handles time namespaces properly.
> 
> Remove the now unnecessary kconfig symbol.
> 
> Enables the use of time namespaces on architectures, which use the
> generic vDSO but did not enable GENERIC_VDSO_TIME_NS, namely MIPS and arm.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
> 
> ---
> Technically this is still too restrictive, as it prevents architectures
> without a real vDSO to enable CONFIG_TIME_NS. Right now this restriction
> only protects the SPARC vDSO. I have patches to drop it completely,
> as soon as SPARC is usingthe generic vDSO.
> ---
>  arch/arm64/Kconfig                   | 1 -

Acked-by: Catalin Marinas <catalin.marinas@....com>