+ mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch added to -mm tree

+ mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/smaps_rollup: return empty file for kthreads instead of ESRCH
has been added to the -mm tree.  Its filename is
     mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch

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------------------------------------------------------
From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Subject: mm/smaps_rollup: return empty file for kthreads instead of ESRCH

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.

Link: https://lkml.kernel.org/r/20220413211357.26938-1-alex_y_xu@yahoo.ca
Fixes: 258f669e7e88 ("mm: /proc/pid/smaps_rollup: convert to single value seq_file")
Signed-off-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/fs/proc/task_mmu.c~mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch
+++ a/fs/proc/task_mmu.c
@@ -883,10 +883,8 @@ static int show_smaps_rollup(struct seq_
 		return -ESRCH;
 
 	mm = priv->mm;
-	if (!mm || !mmget_not_zero(mm)) {
-		ret = -ESRCH;
+	if (!mm || !mmget_not_zero(mm))
 		goto out_put_task;
-	}
 
 	memset(&mss, 0, sizeof(mss));
 
_

Patches currently in -mm which might be from alex_y_xu@yahoo.ca are

mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch.patch