From: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Date: Thu, 14 Apr 2022 06:06:56 +0000 (-0700)
Subject: mm/smaps_rollup: return empty file for kthreads instead of ESRCH
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dc142b3007792ef27f12ddddbabfd312a6d58c2b;p=users%2Fjedix%2Flinux-maple.git

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>
---

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index f46060eb91b5..d7de4584a271 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -883,10 +883,8 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
 		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));