linux-kernel - Re: [RFC v2 PATCH 1/3] mm: add PG2KB/KB2PG helper macros

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Message-ID: <YUdHcXHWNs5Px9AD@casper.infradead.org>
Date:   Sun, 19 Sep 2021 15:21:37 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [RFC v2 PATCH 1/3] mm: add PG2KB/KB2PG helper macros

On Sun, Sep 19, 2021 at 03:12:46PM +0200, Oleksandr Natalenko wrote:
> +#define PG2KB(x)	((x) << (PAGE_SHIFT - 10))
> +#define KB2PG(x)	((x) >> (PAGE_SHIFT - 10))

This is not an improvement.