linux-kernel - mm/Kconfig: warning: (COMPACTION && EXPERIMENTAL && HUGETLB_PAGE && MMU) selects MIGRATION which has unmet direct dependencies (NUMA || ARCH_ENABLE_MEMORY

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Date:	Thu, 9 Sep 2010 17:10:34 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: mm/Kconfig: warning: (COMPACTION && EXPERIMENTAL && HUGETLB_PAGE &&
 MMU) selects MIGRATION which has unmet direct dependencies (NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE)

Hi,

while build latest 2.6.36-rc3 I get this warning:

[ build.log]
...
warning: (COMPACTION && EXPERIMENTAL && HUGETLB_PAGE && MMU) selects
MIGRATION which has unmet direct dependencies (NUMA ||
ARCH_ENABLE_MEMORY_HOTREMOVE)
...

Here the excerpt of...

[ mm/Kconfig ]
...
# support for memory compaction
config COMPACTION
        bool "Allow for memory compaction"
        select MIGRATION
        depends on EXPERIMENTAL && HUGETLB_PAGE && MMU
        help
          Allows the compaction of memory for the allocation of huge pages.
...

I have set the following kernel-config parameters:

$ egrep 'COMPACTION|HUGETLB_PAGE|MMU|MIGRATION|NUMA|ARCH_ENABLE_MEMORY_HOTREMOVE'
linux-2.6.36-rc3/debian/build/build_i386_none_686/.config
CONFIG_MMU=y
# CONFIG_IOMMU_HELPER is not set
CONFIG_IOMMU_API=y
CONFIG_COMPACTION=y
CONFIG_MIGRATION=y
CONFIG_MMU_NOTIFIER=y
CONFIG_HUGETLB_PAGE=y
# CONFIG_IOMMU_STRESS is not set

Looks like I have no NUMA or ARCH_ENABLE_MEMORY_HOTREMOVE set.

Ok, it is a *warning*...

Kind Regards,
- Sedat -
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