linux-kernel - Re: [PATCH] Revert "mm/vmstat.c: do not show lowmem reserve protection information of empty zone"

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Date:   Tue, 11 Aug 2020 14:46:09 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Baoquan He <bhe@...hat.com>
cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, sonnyrao@...omium.org, yuzhao@...gle.com
Subject: Re: [PATCH] Revert "mm/vmstat.c: do not show lowmem reserve protection
 information of empty zone"

On Tue, 11 Aug 2020, Baoquan He wrote:

> This reverts commit 26e7deadaae1755faf1f6d1a68988c4b8348df59.
> 
> Sonny reported that one of their tests started failing on the latest
> kernel on their Chrome OS platform. The root cause is that the above
> commit removed the protection line of empty zone, while the parser used
> in the test relies on the protection line to mark the end of each zone.
> 
> Let's revert it to avoid breaking userspace testing or applications.
> 

Acked-by: David Rientjes <rientjes@...gle.com>

No objection since I noted userspace parsing as a potential risk in 
https://marc.info/?l=linux-mm&m=158507790824995 but I didn't catch this 
earlier patch which could have led to the same thing.