linux-kernel - Re: [patch V3 07/12] uaccess: Provide scoped masked user access regions

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Message-ID: <871pmwz2a3.ffs@tglx>
Date: Tue, 21 Oct 2025 17:45:56 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: David Laight <david.laight.linux@...il.com>, LKML
 <linux-kernel@...r.kernel.org>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Andrew Cooper
 <andrew.cooper3@...rix.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>,
 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, Julia Lawall <Julia.Lawall@...ia.fr>, Nicolas
 Palix <nicolas.palix@...g.fr>, Peter Zijlstra <peterz@...radead.org>,
 Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>,
 André Almeida <andrealmeid@...lia.com>, 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 V3 07/12] uaccess: Provide scoped masked user access
 regions

On Tue, Oct 21 2025 at 05:06, Linus Torvalds wrote:
> On Tue, 21 Oct 2025 at 04:30, Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>> On Mon, Oct 20 2025 at 19:28, David Laight wrote:
>> >
>> > (I don't like the word 'masked' at all, not sure where it came from.
>>
>> It's what Linus named it and I did not think about the name much so far.
>
> The original implementation was a mask application, so it made sense
> at the time.
>
> We could still change it since there aren't that many users, but I'm
> not sure what would be a better name...

I couldn't come up with something sensible for the architecture side.

But for the scope guards I think the simple scoped_user_$MODE_access()
is fine as for the usage site it's just a user access, no?

the scope magic resolves either to the "masked" variant or to the
regular user_access_begin() + speculation barrier depending on
architecture support. But that's under the hood an implementation detail
of the scope...() macros.

Thanks,

        tglx