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

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Message-ID: <f837a5cf-895d-4639-825c-3d12bfe75425@lucifer.local>
Date: Fri, 18 Jul 2025 10:49:36 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Dev Jain <dev.jain@....com>
Cc: 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>,
        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 Fri, Jul 18, 2025 at 03:16:55PM +0530, Dev Jain wrote:
>
> 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 :)
>

*A wild Lorenzo appaers*