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From:   Pintu Kumar <pintu@codeaurora.org>
To:     linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        pintu@codeaurora.org, iamjoonsoo.kim@lge.com, sh_def@163.com,
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        vbabka@suse.cz, yzaikin@google.com, keescook@chromium.org,
        mcgrof@kernel.org, mgorman@techsingularity.net
Cc:     pintu.ping@gmail.com
Subject: [PATCH] mm/compaction: remove unused variable sysctl_compact_memory
Date:   Tue,  2 Mar 2021 23:26:13 +0530
Message-Id: <1614707773-10725-1-git-send-email-pintu@codeaurora.org>
Precedence: bulk

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@codeaurora.org>
Signed-off-by: Pintu Agarwal <pintu.ping@gmail.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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