linux-kernel - [PATCH 1/2] mm: replace COMPACTION_BUILD with IS_ENABLED(CONFIG

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Date:	Wed, 15 Feb 2012 01:37:46 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mm: replace COMPACTION_BUILD with
 IS_ENABLED(CONFIG_COMPACTION)

One more candidate for replacing with IS_ENABLED() macro.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 include/linux/kernel.h |    7 -------
 mm/vmscan.c            |    4 ++--
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e834342..1300307 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -733,13 +733,6 @@ extern int __build_bug_on_failed;
 #define NUMA_BUILD 0
 #endif
 
-/* This helps us avoid #ifdef CONFIG_COMPACTION */
-#ifdef CONFIG_COMPACTION
-#define COMPACTION_BUILD 1
-#else
-#define COMPACTION_BUILD 0
-#endif
-
 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 25ad7ad..4061e91 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -376,7 +376,7 @@ static void set_reclaim_mode(int priority, struct scan_control *sc,
 	 * reclaim/compaction.Depending on the order, we will either set the
 	 * sync mode or just reclaim order-0 pages later.
 	 */
-	if (COMPACTION_BUILD)
+	if (IS_ENABLED(CONFIG_COMPACTION))
 		sc->reclaim_mode = RECLAIM_MODE_COMPACTION;
 	else
 		sc->reclaim_mode = RECLAIM_MODE_LUMPYRECLAIM;
@@ -2255,7 +2255,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
 				continue;
 			if (zone->all_unreclaimable && priority != DEF_PRIORITY)
 				continue;	/* Let kswapd poll it */
-			if (COMPACTION_BUILD) {
+			if (IS_ENABLED(CONFIG_COMPACTION)) {
 				/*
 				 * If we already have plenty of memory free for
 				 * compaction in this zone, don't free any more.

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