linux-kernel - [PATCH v2 1/3] mm: vmscan: move set_task_reclaim_state() after cgroup

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Message-ID: <20230309093109.3039327-2-yosryahmed@google.com>
Date:   Thu,  9 Mar 2023 09:31:07 +0000
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Xu <peterx@...hat.com>, NeilBrown <neilb@...e.de>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, Yu Zhao <yuzhao@...gle.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-mm@...ck.org,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH v2 1/3] mm: vmscan: move set_task_reclaim_state() after cgroup_reclaim()

set_task_reclaim_state() is currently defined in mm/vmscan.c above
an #ifdef CONFIG_MEMCG block where cgroup_reclaim() is defined. We are
about to add some more helpers that operate on reclaim_state, and will
need to use cgroup_reclaim(). Move set_task_reclaim_state() after
the #ifdef CONFIG_MEMCG block containing the definition of
cgroup_reclaim() to keep helpers operating on reclaim_state together.

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 mm/vmscan.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9c1c5e8b24b8..fef7d1c0f82b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -188,18 +188,6 @@ struct scan_control {
  */
 int vm_swappiness = 60;
 
-static void set_task_reclaim_state(struct task_struct *task,
-				   struct reclaim_state *rs)
-{
-	/* Check for an overwrite */
-	WARN_ON_ONCE(rs && task->reclaim_state);
-
-	/* Check for the nulling of an already-nulled member */
-	WARN_ON_ONCE(!rs && !task->reclaim_state);
-
-	task->reclaim_state = rs;
-}
-
 LIST_HEAD(shrinker_list);
 DECLARE_RWSEM(shrinker_rwsem);
 
@@ -511,6 +499,18 @@ static bool writeback_throttling_sane(struct scan_control *sc)
 }
 #endif
 
+static void set_task_reclaim_state(struct task_struct *task,
+				   struct reclaim_state *rs)
+{
+	/* Check for an overwrite */
+	WARN_ON_ONCE(rs && task->reclaim_state);
+
+	/* Check for the nulling of an already-nulled member */
+	WARN_ON_ONCE(!rs && !task->reclaim_state);
+
+	task->reclaim_state = rs;
+}
+
 static long xchg_nr_deferred(struct shrinker *shrinker,
 			     struct shrink_control *sc)
 {
-- 
2.40.0.rc0.216.gc4246ad0f0-goog