From: Carlos Llamas <cmllamas@google.com>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "David Hildenbrand (Red Hat)" <david@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Xu <peterx@redhat.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Ujwal Kundur <ujwal.kundur@gmail.com>,
Brendan Jackman <jackmanb@google.com>,
kernel-team@android.com, linux-kernel@vger.kernel.org,
stable@vger.kernel.org,
"open list:MEMORY MANAGEMENT - USERFAULTFD" <linux-mm@kvack.org>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH] selftests/mm: fix division-by-zero in uffd-unit-tests
Date: Thu, 13 Nov 2025 15:01:25 +0000 [thread overview]
Message-ID: <aRXyxWeh81-aTHaC@google.com> (raw)
In-Reply-To: <4a60a703-d9c2-46a8-83b4-a7ecff7f6ba2@lucifer.local>
On Thu, Nov 13, 2025 at 09:54:37AM +0000, Lorenzo Stoakes wrote:
> On Thu, Nov 13, 2025 at 10:06:42AM +0100, David Hildenbrand (Red Hat) wrote:
> > On 13.11.25 04:46, Carlos Llamas wrote:
> > > Commit 4dfd4bba8578 ("selftests/mm/uffd: refactor non-composite global
> > > vars into struct") moved some of the operations previously implemented
> > > in uffd_setup_environment() earlier in the main test loop.
> > >
> > > The calculation of nr_pages, which involves a division by page_size, now
> > > occurs before checking that default_huge_page_size() returns a non-zero
> > > This leads to a division-by-zero error on systems with !CONFIG_HUGETLB.
> > >
> > > Fix this by relocating the non-zero page_size check before the nr_pages
> > > calculation, as it was originally implemented.
> > >
> > > Cc: stable@vger.kernel.org
> >
> > Do we CC stable on unit tests? From my recollection, no.
>
> Yeah please let's not.
Oops, I keep getting confused about this Cc stable thing. Please let me
know if a v2 dropping the tag is needed.
--
Carlos Llamas
next prev parent reply other threads:[~2025-11-13 15:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 3:46 Carlos Llamas
2025-11-13 9:06 ` David Hildenbrand (Red Hat)
2025-11-13 9:54 ` Lorenzo Stoakes
2025-11-13 15:01 ` Carlos Llamas [this message]
2025-11-13 15:03 ` Lorenzo Stoakes
2025-11-13 23:32 ` Andrew Morton
2025-11-14 8:11 ` David Hildenbrand (Red Hat)
2025-11-14 22:39 ` Andrew Morton
2025-11-17 17:31 ` Ujwal Kundur
2025-11-13 11:42 ` Mike Rapoport
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