[merged mm-stable] mm-annotate-data-race-in-update_hiwater_rss.patch removed from -mm tree

[merged mm-stable] mm-annotate-data-race-in-update_hiwater_rss.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: annotate data race in update_hiwater_rss
has been removed from the -mm tree.  Its filename was
     mm-annotate-data-race-in-update_hiwater_rss.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Ignacio Encinas <ignacio@iencinas.com>
Subject: mm: annotate data race in update_hiwater_rss
Date: Mon, 31 Mar 2025 21:57:05 +0200

mm_struct.hiwater_rss can be accessed concurrently without proper
synchronization as reported by KCSAN.

This data race is benign as it only affects accounting information.
Annotate it with data_race() to make KCSAN happy.

Link: https://lkml.kernel.org/r/20250331-mm-maxrss-data-race-v2-1-cf958e6205bf@iencinas.com
Signed-off-by: Ignacio Encinas <ignacio@iencinas.com>
Reported-by: syzbot+419c4b42acc36c420ad3@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/67e3390c.050a0220.1ec46.0001.GAE@google.com/
Suggested-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Cc: Liam Howlett <liam.howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mm.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/mm.h~mm-annotate-data-race-in-update_hiwater_rss
+++ a/include/linux/mm.h
@@ -12,6 +12,7 @@
 #include <linux/rbtree.h>
 #include <linux/atomic.h>
 #include <linux/debug_locks.h>
+#include <linux/compiler.h>
 #include <linux/mm_types.h>
 #include <linux/mmap_lock.h>
 #include <linux/range.h>
@@ -2796,7 +2797,7 @@ static inline void update_hiwater_rss(st
 {
 	unsigned long _rss = get_mm_rss(mm);
 
-	if ((mm)->hiwater_rss < _rss)
+	if (data_race(mm->hiwater_rss) < _rss)
 		(mm)->hiwater_rss = _rss;
 }
 
_

Patches currently in -mm which might be from ignacio@iencinas.com are