[PATCH v2] mm/Kconfig: add MMU dependency for MIGRATION.

[Chen Gang <gang.chen@asianux.com>]

MIGRATION need depend on MMU, or allmodconfig for sh architecture which
without MMU will be fail for compiling.

The related error: 

    CC      mm/migrate.o
  mm/migrate.c: In function 'remove_migration_pte':
  mm/migrate.c:134:3: error: implicit declaration of function 'pmd_trans_huge' [-Werror=implicit-function-declaration]
     if (pmd_trans_huge(*pmd))
     ^
  mm/migrate.c:149:2: error: implicit declaration of function 'is_swap_pte' [-Werror=implicit-function-declaration]
    if (!is_swap_pte(pte))
    ^
  ...

Also need let CMA depend on MMU, or when NOMMU, if select CMA, it will
select MIGRATION by force.


Signed-off-by: Chen Gang <gang.chen@asianux.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
---
 mm/Kconfig |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 256bfd0..e847f19 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -245,7 +245,7 @@ config COMPACTION
 config MIGRATION
 	bool "Page migration"
 	def_bool y
-	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION || CMA
+	depends on (NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION || CMA) && MMU
 	help
 	  Allows the migration of the physical location of pages of processes
 	  while the virtual addresses are not changed. This is useful in
@@ -522,7 +522,7 @@ config MEM_SOFT_DIRTY
 
 config CMA
 	bool "Contiguous Memory Allocator"
-	depends on HAVE_MEMBLOCK
+	depends on HAVE_MEMBLOCK && MMU
 	select MIGRATION
 	select MEMORY_ISOLATION
 	help
-- 
1.7.7.6

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