linux-kernel - Re: [patch V4 10/12] futex: Convert to scoped user access

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Message-ID: <CAHk-=wjoQvKpfB4X0ftqM0P0kzaZxor7C1JBC5PrLPY-ca=fnA@mail.gmail.com>
Date: Thu, 23 Oct 2025 09:26:12 -1000
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>, 
	André Almeida <andrealmeid@...lia.com>, 
	kernel test robot <lkp@...el.com>, Russell King <linux@...linux.org.uk>, 
	linux-arm-kernel@...ts.infradead.org, x86@...nel.org, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, 
	Nicholas Piggin <npiggin@...il.com>, Christophe Leroy <christophe.leroy@...roup.eu>, 
	linuxppc-dev@...ts.ozlabs.org, Paul Walmsley <pjw@...nel.org>, 
	Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org, 
	Heiko Carstens <hca@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Cooper <andrew.cooper3@...rix.com>, 
	David Laight <david.laight.linux@...il.com>, Julia Lawall <Julia.Lawall@...ia.fr>, 
	Nicolas Palix <nicolas.palix@...g.fr>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org
Subject: Re: [patch V4 10/12] futex: Convert to scoped user access

On Thu, 23 Oct 2025 at 08:44, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> But as you said out-of-line function call it occured to me that these
> helpers might be just named get/put_user_inline(). Hmm?

Yeah, with a comment that clearly says "you need to have actual
performance numbers for why this needs to be inlined" for people to
use it.

           Linus