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mm: make CONFIG_MIGRATION available w/o CONFIG_NUMA

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We'd like to support CONFIG_MEMORY_HOTREMOVE on s390, which depends on
CONFIG_MIGRATION.  So far, CONFIG_MIGRATION is only available with NUMA
support.

This patch makes CONFIG_MIGRATION selectable for architectures that define
ARCH_ENABLE_MEMORY_HOTREMOVE.  When MIGRATION is enabled w/o NUMA, the
kernel won't compile because migrate_vmas() does not know about
vm_ops->migrate() and vma_migratable() does not know about policy_zone.
To fix this, those two functions can be restricted to '#ifdef CONFIG_NUMA'
because they are not being used w/o NUMA.  vma_migratable() is moved over
from migrate.h to mempolicy.h.

[[email protected]: build fix]
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Gerald Schaefer <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Signed-off-by: KOSAKI Motorhiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Gerald Schaefer 2008-07-23 21:28:22 -07:00 • committed by Linus Torvalds
commit 83d1674a94
4 changed files with 21 additions and 23 deletions
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2
mm/Kconfig
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@ -174,7 +174,7 @@ config SPLIT_PTLOCK_CPUS
config MIGRATION
bool "Page migration"
def_bool y
depends on NUMA
depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
help
Allows the migration of the physical location of pages of processes
while the virtual addresses are not changed. This is useful for