From: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>
To: "David Hildenbrand (Red Hat)" <david@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.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>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] selftest/mm: fix pointer comparison in mremap_test
Date: Thu, 6 Nov 2025 17:32:47 +0530 [thread overview]
Message-ID: <aQyOZ6eYng-IjxS_@fedora> (raw)
In-Reply-To: <fc051006-5cb2-49e1-bb27-7839837439cd@kernel.org>
On Thu, Nov 06, 2025 at 12:18:57PM +0100, David Hildenbrand (Red Hat) wrote:
> On 06.11.25 11:49, Ankit Khushwaha wrote:
> > Pointer arthemitic with 'void * addr' and 'unsigned long long dest_alignment'
> > triggers following warning:
> >
> > mremap_test.c:1035:31: warning: pointer comparison always evaluates to
> > false [-Wtautological-compare]
> > 1035 | if (addr + c.dest_alignment < addr) {
> > | ^
> >
> > typecasting 'addr' to 'unsigned long long' to fix pointer comparison.
>
> With which compiler are you seeing this?
Hi David,
clang version 20.1.8 (Fedora 20.1.8-4.fc42) raised this warning.
To reproduce:
make -C tools/testing/selftests/mm CC=clang
Thanks,
--
Ankit
next prev parent reply other threads:[~2025-11-06 12:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-06 10:49 Ankit Khushwaha
2025-11-06 11:18 ` David Hildenbrand (Red Hat)
2025-11-06 12:02 ` Ankit Khushwaha [this message]
2025-11-06 14:26 ` Lorenzo Stoakes
2025-11-07 9:27 ` David Hildenbrand (Red Hat)
2025-11-08 0:08 ` Andrew Morton
2025-11-08 16:03 ` Ankit Khushwaha
2025-11-09 6:54 ` Mike Rapoport
2025-11-09 19:11 ` Vlastimil Babka
2025-11-10 21:43 ` Nathan Chancellor
2025-11-06 14:40 ` Lorenzo Stoakes
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