+ mm-memcg-prevent-memoryoom_control-load-store-tearing-v3.patch added to mm-unstable branch

+ mm-memcg-prevent-memoryoom_control-load-store-tearing-v3.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm-memcg-prevent-memoryoom_control-load-store-tearing-v3
has been added to the -mm mm-unstable branch.  Its filename is
     mm-memcg-prevent-memoryoom_control-load-store-tearing-v3.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcg-prevent-memoryoom_control-load-store-tearing-v3.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yue Zhao <findns94@gmail.com>
Subject: mm-memcg-prevent-memoryoom_control-load-store-tearing-v3
Date: Thu, 9 Mar 2023 00:25:54 +0800

Add [WRITE|READ]_ONCE for all occurrences of memcg->oom_kill_disable,
memcg->swappiness and memcg->soft_limit

Link: https://lkml.kernel.org/r/20230308162555.14195-4-findns94@gmail.com
Signed-off-by: Yue Zhao <findns94@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tang Yizhou <tangyeechou@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/memcontrol.c~mm-memcg-prevent-memoryoom_control-load-store-tearing-v3
+++ a/mm/memcontrol.c
@@ -1929,7 +1929,7 @@ static bool mem_cgroup_oom(struct mem_cg
 	 * Please note that mem_cgroup_out_of_memory might fail to find a
 	 * victim and then we have to bail out from the charge path.
 	 */
-	if (memcg->oom_kill_disable) {
+	if (READ_ONCE(memcg->oom_kill_disable)) {
 		if (current->in_user_fault) {
 			css_get(&memcg->css);
 			current->memcg_in_oom = memcg;
@@ -1999,7 +1999,7 @@ bool mem_cgroup_oom_synchronize(bool han
 	if (locked)
 		mem_cgroup_oom_notify(memcg);
 
-	if (locked && !memcg->oom_kill_disable) {
+	if (locked && !READ_ONCE(memcg->oom_kill_disable)) {
 		mem_cgroup_unmark_under_oom(memcg);
 		finish_wait(&memcg_oom_waitq, &owait.wait);
 		mem_cgroup_out_of_memory(memcg, current->memcg_oom_gfp_mask,
@@ -5354,7 +5354,7 @@ mem_cgroup_css_alloc(struct cgroup_subsy
 	page_counter_set_high(&memcg->swap, PAGE_COUNTER_MAX);
 	if (parent) {
 		WRITE_ONCE(memcg->swappiness, mem_cgroup_swappiness(parent));
-		memcg->oom_kill_disable = parent->oom_kill_disable;
+		WRITE_ONCE(memcg->oom_kill_disable, READ_ONCE(parent->oom_kill_disable));
 
 		page_counter_init(&memcg->memory, &parent->memory);
 		page_counter_init(&memcg->swap, &parent->swap);
_

Patches currently in -mm which might be from findns94@gmail.com are

mm-memcg-prevent-memoryoomgroup-load-store-tearing.patch
mm-memcg-prevent-memoryswappiness-load-store-tearing.patch
mm-memcg-prevent-memoryswappiness-load-store-tearing-v3.patch
mm-memcg-prevent-memoryoom_control-load-store-tearing.patch
mm-memcg-prevent-memoryoom_control-load-store-tearing-v3.patch
mm-memcg-prevent-memorysoft_limit_in_bytes-load-store-tearing.patch
mm-memcg-prevent-memorysoft_limit_in_bytes-load-store-tearing-v3.patch