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Date:   Wed, 13 Apr 2022 14:27:48 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Cc:     Vlastimil Babka <vbabka@suse.cz>,
        Daniel Colascione <dancol@google.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Alexey Dobriyan <adobriyan@gmail.com>,
        linux-api@vger.kernel.org
Subject: Re: [PATCH] mm/smaps_rollup: return empty file for kthreads instead
 of ESRCH
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In-Reply-To: <20220413211357.26938-1-alex_y_xu@yahoo.ca>
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On Wed, 13 Apr 2022 17:13:57 -0400 "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca> wrote:

> This restores the behavior prior to 258f669e7e88 ("mm:
> /proc/pid/smaps_rollup: convert to single value seq_file"), making it
> once again consistent with maps and smaps, and allowing patterns like
> awk '$1=="Anonymous:"{x+=$2}END{print x}' /proc/*/smaps_rollup to work.
> Searching all Debian packages for "smaps_rollup" did not find any
> programs which would be affected by this change.

Thanks.

258f669e7e88 was 4 years ago, so I guess a -stable backport isn't
really needed.

However, we need to be concerned about causing new regressions, and I
don't think you've presented enough information for this to be determined.

So please provide us with a full description of how the smaps_rollup
output will be altered by this patch.  Quoting example output would be
helpful.