linux-kernel - Re: [PATCH] mm/vmscan: restore zone_reclaim

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Message-ID: <20200629071338.m4veigbp4tu45gbz@beryllium.lan>
Date:   Mon, 29 Jun 2020 09:13:38 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        ben.widawsky@...el.com, alex.shi@...ux.alibaba.com,
        tobin@...nel.org, cl@...ux.com, akpm@...ux-foundation.org,
        stable@...nel.org
Subject: Re: [PATCH] mm/vmscan: restore zone_reclaim_mode ABI

Hi Dave,

On Fri, Jun 26, 2020 at 06:53:33AM -0700, Dave Hansen wrote:
> Was there something else specifically in the documentation which you
> think I've neglected?

The first paragraph explains how you ended up modifying the code. While
I understand that you want to document the process, it wont help
a reader in future. It doesn't add any intersting information at all.
Just state what you're doing as first thing and explain why you are
doing it after it.

> > I think the documentation update should not be part of this patch.
> > This makes the back porting to stable more difficult.
> 
> Really?  If a backporter doesn't care about documentation, I'd just
> expect them to see the reject, ignore it, and move on with their life.
> If they do, they'd want the code fix and the Documentation/ update in
> the same patch so that they don't get disconnected.

I understood you are fixing a regression ingroduced by a previous change. In
this case I would only fix the regression. Updating/improving the
documentation is good, I just don't think it's necessary to back port it to
stables trees along side the bug fix.

Thanks,
Daniel