linux-kernel - Re: [PATCH] selftest/mm: fix pointer comparison in mremap

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Message-ID: <fc051006-5cb2-49e1-bb27-7839837439cd@kernel.org>
Date: Thu, 6 Nov 2025 12:18:57 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Ankit Khushwaha <ankitkhushwaha.linux@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Shuah Khan <shuah@...nel.org>, linux-mm@...ck.org,
 linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftest/mm: fix pointer comparison in mremap_test

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