On Sun, Aug 04, 2013 at 10:41:01AM +0530, Manjunath Goudar wrote:
>s patch adds a Kconfig dependency on an MMU being available before
>CMA can be enabled.  Without this patch, CMA can be enabled on an
>MMU-less system which can lead to issues. This was discovered during
>randconfig testing, in which CMA was enabled w/o MMU being enabled,
>leading to the following 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:137:3: error: implicit declaration of function ‘pte_offset_map’
>[-Werror=implicit-function-declaration]
>   ptep = pte_offset_map(pmd, addr);
>

Similar one.

http://marc.info/?l=linux-mm&m=137532486405085&w=2

>Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
>Acked-by: Arnd Bergmann <arnd@linaro.org>
>Cc: Deepak Saxena <dsaxena@linaro.org>
>Cc: IWAMOTO Toshihiro <iwamoto@valinux.co.jp>
>Cc: Hirokazu Takahashi <taka@valinux.co.jp>
>Cc: Dave Hansen <haveblue@us.ibm.com>
>Cc: linux-mm@kvack.org
>Cc: Johannes Weiner <hannes@cmpxchg.org>
>Cc: Michal Hocko <mhocko@suse.cz>
>Cc: Balbir Singh <bsingharora@gmail.com>
>Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>---
> mm/Kconfig |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/mm/Kconfig b/mm/Kconfig
>index 256bfd0..ad6b98e 100644
>--- a/mm/Kconfig
>+++ b/mm/Kconfig
>@@ -522,7 +522,7 @@ config MEM_SOFT_DIRTY
>
> config CMA
>       bool "Contiguous Memory Allocator"
>-      depends on HAVE_MEMBLOCK
>+      depends on MMU && HAVE_MEMBLOCK
>       select MIGRATION
>       select MEMORY_ISOLATION
>       help
>--
>1.7.9.5
>

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