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Thu, 06 Nov 2025 04:02:55 -0800 (PST) Date: Thu, 6 Nov 2025 17:32:47 +0530 From: Ankit Khushwaha To: "David Hildenbrand (Red Hat)" Cc: Andrew Morton , Lorenzo Stoakes , "Liam R. 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: 217C7140009 X-Stat-Signature: gwdbb5a57ooc5pspapofp4xkfsrz549w X-HE-Tag: 1762430576-525359 X-HE-Meta: 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 WaZgsZQ6 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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