lkml.org 
[lkml]   [2008]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] Make CONFIG_MIGRATION available for s390
From
Date
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>
---

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



\
 
 \ /
  Last update: 2008-07-04 17:01    [W:0.068 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site