linux-kernel - Re: [PATCH] mm: Replace (20 - PAGE_SHIFT) with common macros for pages<->MB conversion

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Message-ID: <d68d1947-3ef5-4171-aa0b-73f7189b74ab@arm.com>
Date: Fri, 18 Jul 2025 15:16:55 +0530
From: Dev Jain <dev.jain@....com>
To: Ye Liu <ye.liu@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>, Davidlohr Bueso <dave@...olabs.net>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Josh Triplett <josh@...htriplett.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
 Joel Fernandes <joelagnelf@...dia.com>, Boqun Feng <boqun.feng@...il.com>,
 Uladzislau Rezki <urezki@...il.com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Ye Liu <liuye@...inos.cn>, "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>,
 Steven Rostedt <rostedt@...dmis.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang@...ux.dev>,
 Dietmar Eggemann <dietmar.eggemann@....com>, Ben Segall
 <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
 Valentin Schneider <vschneid@...hat.com>, Zi Yan <ziy@...dia.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Barry Song <baohua@...nel.org>,
 Kemeng Shi <shikemeng@...weicloud.com>, Kairui Song <kasong@...cent.com>,
 Nhat Pham <nphamcs@...il.com>, Baoquan He <bhe@...hat.com>,
 Chris Li <chrisl@...nel.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Subject: Re: [PATCH] mm: Replace (20 - PAGE_SHIFT) with common macros for
 pages<->MB conversion

On 18/07/25 8:11 am, Ye Liu wrote:
> From: Ye Liu <liuye@...inos.cn>
>
> Replace repeated (20 - PAGE_SHIFT) calculations with standard macros:
> - MB_TO_PAGES(mb)    converts MB to page count
> - PAGES_TO_MB(pages) converts pages to MB
>
> No functional change.
>
> Signed-off-by: Ye Liu <liuye@...inos.cn>
> ---
>   

sh and x86 have their own pages_to_mb, drivers/target/target_core_user.c too.
I guess no one likes to clean the kernel :)