linux-kernel - Re: [PATCH RESEND v2 1/2] ucount: Fix atomic_long_inc

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Message-Id: <20250721154325.476b87e09aa5d778bcead478@linux-foundation.org>
Date: Mon, 21 Jul 2025 15:43:25 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-kernel@...r.kernel.org, "Eric W. Biederman"
 <ebiederm@...ssion.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 "Paul E. McKenney" <paulmck@...nel.org>, Alexey Gladkov
 <legion@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>, MengEn Sun
 <mengensun@...cent.com>, Thomas Weißschuh
 <linux@...ssschuh.net>
Subject: Re: [PATCH RESEND v2 1/2] ucount: Fix atomic_long_inc_below()
 argument type

On Mon, 21 Jul 2025 19:45:57 +0200 Uros Bizjak <ubizjak@...il.com> wrote:

> The type of u argument of atomic_long_inc_below() should be long
> to avoid unwanted truncation to int.
> 
> Fixes: f9c82a4ea89c ("Increase size of ucounts to atomic_long_t")

Please (always!) provide a description of the userspace-visible effects
of the bug.  That way I (and others) can decide whether the fix should
be backported.  And people will be able to determine whether this patch
may fix problems which they are observing.  Thanks.