linux-kernel - Re: [PATCH v3] vdso: Remove struct getcpu

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Message-Id: <324be2f3-092c-4796-a7ae-4cddbc65ec00@app.fastmail.com>
Date: Tue, 30 Dec 2025 22:23:36 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 "Huacai Chen" <chenhuacai@...nel.org>, "WANG Xuerui" <kernel@...0n.name>,
 "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>, "Andy Lutomirski" <luto@...nel.org>,
 "Thomas Gleixner" <tglx@...utronix.de>, "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>,
 "Vincenzo Frascino" <vincenzo.frascino@....com>, shuah <shuah@...nel.org>
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-s390@...r.kernel.org, linux-api@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3] vdso: Remove struct getcpu_cache

On Tue, Dec 30, 2025, at 08:08, Thomas Weißschuh wrote:
> The cache parameter of getcpu() is useless nowadays for various reasons.
> * It is never passed by userspace for either the vDSO or syscalls.
> * It is never used by the kernel.
> * It could not be made to work on the current vDSO architecture.
> * The structure definition is not part of the UAPI headers.
> * vdso_getcpu() is superseded by restartable sequences in any case.
>
> Remove the struct and its header.
>
> As a side-effect we get rid of an unwanted inclusion of the linux/
> header namespace from vDSO code.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>

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