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SubjectRe: [PATCH] Make CONFIG_MIGRATION available for s390
On Fri, 04 Jul 2008 16:58:59 +0200
Gerald Schaefer <gerald.schaefer@de.ibm.com> wrote:

> Subject: [PATCH] Make CONFIG_MIGRATION available for s390
>
> From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
>
> 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 s390. When MIGRATION
> is enabled w/o NUMA, the kernel won't compile because of a missing
> "migrate" member in vm_operations_struct and a missing "policy_zone"
> definition. To avoid this, those are moved from an "#ifdef CONFIG_NUMA"
> section to "#ifdef CONFIG_MIGRATION".
>
> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
> ---

Maybe make sense

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

>
> include/linux/mempolicy.h | 6 ++++--
> include/linux/mm.h | 2 ++
> mm/Kconfig | 2 +-
> 3 files changed, 7 insertions(+), 3 deletions(-)
>
> Index: mylinux-git/include/linux/mempolicy.h
> ===================================================================
> --- mylinux-git.orig/include/linux/mempolicy.h
> +++ mylinux-git/include/linux/mempolicy.h
> @@ -62,6 +62,10 @@ enum {
>
> struct mm_struct;
>
> +#ifdef CONFIG_MIGRATION
> +extern enum zone_type policy_zone;
> +#endif
> +
> #ifdef CONFIG_NUMA
>
> /*
> @@ -202,8 +206,6 @@ extern struct zonelist *huge_zonelist(st
> struct mempolicy **mpol, nodemask_t **nodemask);
> extern unsigned slab_node(struct mempolicy *policy);
>
> -extern enum zone_type policy_zone;
> -
> static inline void check_highest_zone(enum zone_type k)
> {
> if (k > policy_zone && k != ZONE_MOVABLE)
> Index: mylinux-git/include/linux/mm.h
> ===================================================================
> --- mylinux-git.orig/include/linux/mm.h
> +++ mylinux-git/include/linux/mm.h
> @@ -193,6 +193,8 @@ struct vm_operations_struct {
> */
> struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
> unsigned long addr);
> +#endif
> +#ifdef CONFIG_MIGRATION
> int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
> const nodemask_t *to, unsigned long flags);
> #endif
> Index: mylinux-git/mm/Kconfig
> ===================================================================
> --- mylinux-git.orig/mm/Kconfig
> +++ mylinux-git/mm/Kconfig
> @@ -174,7 +174,7 @@ config SPLIT_PTLOCK_CPUS
> config MIGRATION
> bool "Page migration"
> def_bool y
> - depends on NUMA
> + depends on NUMA || S390
> help
> Allows the migration of the physical location of pages of processes
> while the virtual addresses are not changed. This is useful for
>
>
> --
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