Commit de32a817 authored Sep 12, 2013 by Chen Gang Committed by Linus Torvalds Sep 12, 2013

mm/Kconfig: add MMU dependency for MIGRATION.



MIGRATION must depend on MMU, or allmodconfig for the nommu sh
architecture fails to build:

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

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 6072ddc8

mm/Kconfig

+2 −2

Original line number	Diff line number	Diff line
		@@ -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
		@@ -480,7 +480,7 @@ config FRONTSWAP

		config CMA
		bool "Contiguous Memory Allocator"
		depends on HAVE_MEMBLOCK
		depends on HAVE_MEMBLOCK && MMU
		select MIGRATION
		select MEMORY_ISOLATION
		help

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