linux-kernel - Re: [PATCH] selftests/mm: fix division-by-zero in uffd-unit-tests

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Message-Id: <20251114143909.14ecee31b88f179bc2858e30@linux-foundation.org>
Date: Fri, 14 Nov 2025 14:39:09 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Carlos Llamas
 <cmllamas@...gle.com>, Peter Xu <peterx@...hat.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport
 <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko
 <mhocko@...e.com>, Shuah Khan <shuah@...nel.org>, Ujwal Kundur
 <ujwal.kundur@...il.com>, Brendan Jackman <jackmanb@...gle.com>,
 kernel-team@...roid.com, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, "open list:MEMORY MANAGEMENT - USERFAULTFD"
 <linux-mm@...ck.org>, "open list:KERNEL SELFTEST FRAMEWORK"
 <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH] selftests/mm: fix division-by-zero in uffd-unit-tests

On Fri, 14 Nov 2025 09:11:40 +0100 "David Hildenbrand (Red Hat)" <david@...nel.org> wrote:

> >>> Oops, I keep getting confused about this Cc stable thing. Please let me
> >>> know if a v2 dropping the tag is needed.
> >>
> >> No need, Andrew should spot the objection and drop the tag :)
> > 
> > I actually add cc:stable tags to selftests fixes!
> > 
> > Because why not.  Why leave people running known-to-be-buggy code when
> > our backporting processes are so well-functioning and lightweight?
> > 
> > I'm not getting the objection?
> 
> I thought we were so inconsistent on that that it ends up being a wasted 
> effort to even try taking care about stability of selfests in stable trees.

Oh,  I try to be vigilant about it.

hp2:/usr/src/mm> git log tools/testing/selftests/mm | grep stable@|wc
     44      89    1462

I pass selftests patches through the same brain algorithm as
I do everything else, shrug.