[PATCH -mm] enable CONFIG_COMPACTION by default

[Rik van Riel]

Now that lumpy reclaim has been removed, compaction is the
only way left to free up contiguous memory areas. It is time
to just enable CONFIG_COMPACTION by default.
    
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>

diff --git a/mm/Kconfig b/mm/Kconfig
index d5c8019..32ea0ef 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -191,6 +191,7 @@ config SPLIT_PTLOCK_CPUS
 # support for memory compaction
 config COMPACTION
 	bool "Allow for memory compaction"
+	def_bool y
 	select MIGRATION
 	depends on MMU
 	help
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