[patch] mm: introduce a common interface for balloon pages mobility fix

[David Rientjes <rientjes@google.com>]

On Fri, 16 Nov 2012, kbuild test robot wrote:

> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.6
> head:   12dfb061e5fd15be23451418da01281625c0eeae
> commit: 86929cfa5f751de3d8be5a846535282730865d8a [365/437] mm: introduce a common interface for balloon pages mobility
> config: make ARCH=sh allyesconfig
> 
> All warnings:
> 
> warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> --
> warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> 

mm: introduce a common interface for balloon pages mobility fix

CONFIG_BALLOON_COMPACTION shouldn't be selecting options that may not be 
supported, so make it depend on memory compaction rather than selecting 
it.  CONFIG_COMPACTION is enabled by default for all configs that support 
it.
    
Signed-off-by: David Rientjes <rientjes@google.com>
---
 mm/Kconfig |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -191,8 +191,7 @@ config SPLIT_PTLOCK_CPUS
 # support for memory balloon compaction
 config BALLOON_COMPACTION
 	bool "Allow for balloon memory compaction/migration"
-	select COMPACTION
-	depends on VIRTIO_BALLOON
+	depends on VIRTIO_BALLOON && COMPACTION
 	help
 	  Memory fragmentation introduced by ballooning might reduce
 	  significantly the number of 2MB contiguous memory blocks that can be

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