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Date: Thu, 6 Nov 2025 12:18:57 +0100
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Subject: Re: [PATCH] selftest/mm: fix pointer comparison in mremap_test
To: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>,
 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
Cc: linux-kernel@vger.kernel.org
References: <20251106104917.39890-1-ankitkhushwaha.linux@gmail.com>
From: "David Hildenbrand (Red Hat)" <david@kernel.org>
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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?

-- 
Cheers

David