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

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Message-ID: <28DD183E-6E00-4A73-8F22-82DD74E3FBD9@nvidia.com>
Date: Fri, 18 Jul 2025 10:32:59 -0400
From: Zi Yan <ziy@...dia.com>
To: Ye Liu <ye.liu@...ux.dev>
Cc: 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>, 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>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....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 17 Jul 2025, at 22:41, 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>
> ---
>  include/linux/mm.h    | 9 +++++++++
>  kernel/rcu/rcuscale.c | 2 +-
>  kernel/sched/fair.c   | 5 ++---
>  mm/backing-dev.c      | 2 +-
>  mm/huge_memory.c      | 2 +-
>  mm/swap.c             | 2 +-
>  6 files changed, 15 insertions(+), 7 deletions(-)
>

Thanks.

Acked-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan, Zi