Re: [PATCH v2] mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1)

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To: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: Re: [PATCH v2] mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1)
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Date: Thu, 19 Aug 2021 14:10:20 -0400
Cc: guro@xxxxxx, mhocko@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, shakeelb@xxxxxxxxxx, vdavydov.dev@xxxxxxxxx, willy@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <20210819150712.59948-1-songmuchun@bytedance.com>
References: <20210819150712.59948-1-songmuchun@bytedance.com>

On Thu, Aug 19, 2021 at 11:07:12PM +0800, Muchun Song wrote:
> Instead of hard-coding ((1UL << NR_PAGEFLAGS) - 1) everywhere, introducing
> PAGEFLAGS_MASK to make the code clear to get the page flags.
> 
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>

LGTM.

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>

References:
- [PATCH v2] mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1)
  - From: Muchun Song

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