linux-kernel - [PATCH] mm/compaction: remove unused variable sysctl_compact

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Date:   Tue,  2 Mar 2021 23:26:13 +0530
From:   Pintu Kumar <pintu@...eaurora.org>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        pintu@...eaurora.org, iamjoonsoo.kim@....com, sh_def@....com,
        mateusznosek0@...il.com, bhe@...hat.com, nigupta@...dia.com,
        vbabka@...e.cz, yzaikin@...gle.com, keescook@...omium.org,
        mcgrof@...nel.org, mgorman@...hsingularity.net
Cc:     pintu.ping@...il.com
Subject: [PATCH] mm/compaction: remove unused variable sysctl_compact_memory

The sysctl_compact_memory is mostly unsed in mm/compaction.c
It just acts as a place holder for sysctl.

Thus we can remove it from here and move the declaration directly
in kernel/sysctl.c itself.
This will also eliminate the extern declaration from header file.
No functionality is broken or changed this way.

Signed-off-by: Pintu Kumar <pintu@...eaurora.org>
Signed-off-by: Pintu Agarwal <pintu.ping@...il.com>
---
 include/linux/compaction.h | 1 -
 kernel/sysctl.c            | 1 +
 mm/compaction.c            | 3 ---
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index ed4070e..4221888 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -81,7 +81,6 @@ static inline unsigned long compact_gap(unsigned int order)
 }
 
 #ifdef CONFIG_COMPACTION
-extern int sysctl_compact_memory;
 extern unsigned int sysctl_compaction_proactiveness;
 extern int sysctl_compaction_handler(struct ctl_table *table, int write,
 			void *buffer, size_t *length, loff_t *ppos);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c9fbdd8..66aff21 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -198,6 +198,7 @@ static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 #ifdef CONFIG_COMPACTION
 static int min_extfrag_threshold;
 static int max_extfrag_threshold = 1000;
+static int sysctl_compact_memory;
 #endif
 
 #endif /* CONFIG_SYSCTL */
diff --git a/mm/compaction.c b/mm/compaction.c
index 190ccda..ede2886 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2650,9 +2650,6 @@ static void compact_nodes(void)
 		compact_node(nid);
 }
 
-/* The written value is actually unused, all memory is compacted */
-int sysctl_compact_memory;
-
 /*
  * Tunable for proactive compaction. It determines how
  * aggressively the kernel should compact memory in the
-- 
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is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.