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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , 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 Message-ID: References: <20251106104917.39890-1-ankitkhushwaha.linux@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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