Re: [PATCH RESEND v2 1/2] ucount: Fix atomic_long_inc_below() argument type

[Uros Bizjak]

On Tue, Jul 22, 2025 at 12:43 AM Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Mon, 21 Jul 2025 19:45:57 +0200 Uros Bizjak <ubizjak@xxxxxxxxx> 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.

The patch fixes the wrong argument type of an internal function to
prevent unwanted argument truncation. It fixes an internal locking
primitive; it should not have any direct effect on userspace.

Uros.