linux-kernel - Re: [PATCH v2 03/10] uaccess: Add masked_user_{read/write}_access

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Message-ID: <87h5xw3ggw.ffs@tglx>
Date: Sun, 24 Aug 2025 17:08:15 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Christophe Leroy <christophe.leroy@...roup.eu>, Michael Ellerman
 <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, Madhavan
 Srinivasan <maddy@...ux.ibm.com>, Alexander Viro
 <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan
 Kara <jack@...e.cz>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra
 <peterz@...radead.org>, Darren Hart <dvhart@...radead.org>, Davidlohr
 Bueso <dave@...olabs.net>, Andre Almeida <andrealmeid@...lia.com>, Andrew
 Morton <akpm@...ux-foundation.org>, David Laight
 <david.laight.linux@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Daniel Borkmann
 <daniel@...earbox.net>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
 linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
 linux-block@...r.kernel.org
Subject: Re: [PATCH v2 03/10] uaccess: Add
 masked_user_{read/write}_access_begin

On Fri, Aug 22 2025 at 11:57, Christophe Leroy wrote:

> Allthough masked_user_access_begin() is to only be used when reading
> data from user at the moment, introduce masked_user_read_access_begin()
> and masked_user_write_access_begin() in order to match
> user_read_access_begin() and user_write_access_begin().
>
> That means masked_user_read_access_begin() is used when user memory is
> exclusively read during the window, masked_user_write_access_begin()
> is used when user memory is exclusively writen during the window,
> masked_user_access_begin() remains and is used when both reads and
> writes are performed during the open window. Each of them is expected
> to be terminated by the matching user_read_access_end(),
> user_write_access_end() and user_access_end().
>
> Have them default to masked_user_access_begin() when they are
> not defined.

Have you seen:

    https://lore.kernel.org/all/20250813151939.601040635@linutronix.de