Re: migrate_pages_to not defined ...

[Christoph Lameter <clameter@sgi.com>]

On Mon, 27 Mar 2006, Yinghai Lu wrote:

> please check the migrate)pages_to in migrate.h...
> otherwise  I can not compile the kernel if i disable the swap in config.

Right. migrate_pages_to in mempolicy.cis also called from mbind() outside 
of CONFIG_MIGRATION sigh.

> +static inline int migrate_pages_to(struct list_head *pagelist,
> +                        struct vm_area_struct *vma, int dest) {
> return -ENOSYS; }

No it needs to return the number of pages not ENOSYS.

> diff --git a/mm/migrate.c b/mm/migrate.c
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -653,3 +653,4 @@ out:
>                 nr_pages++;
>         return nr_pages;
>  }
> +EXPORT_SYMBOL(migrate_pages_to);

Why add an export?

Could you try this patch?



Fix migrate_pages_to() definition.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6/include/linux/migrate.h
===================================================================
--- linux-2.6.orig/include/linux/migrate.h	2006-03-22 09:29:49.000000000 -0800
+++ linux-2.6/include/linux/migrate.h	2006-03-27 18:33:52.000000000 -0800
@@ -12,7 +12,7 @@ extern void migrate_page_copy(struct pag
 extern int migrate_page_remove_references(struct page *, struct page *, int);
 extern int migrate_pages(struct list_head *l, struct list_head *t,
 		struct list_head *moved, struct list_head *failed);
-int migrate_pages_to(struct list_head *pagelist,
+extern int migrate_pages_to(struct list_head *pagelist,
 			struct vm_area_struct *vma, int dest);
 extern int fail_migrate_page(struct page *, struct page *);
 
@@ -26,6 +26,9 @@ static inline int putback_lru_pages(stru
 static inline int migrate_pages(struct list_head *l, struct list_head *t,
 	struct list_head *moved, struct list_head *failed) { return -ENOSYS; }
 
+static int migrate_pages_to(struct list_head *pagelist,
+			struct vm_area_struct *vma, int dest) { return 0; }
+
 static inline int migrate_prep(void) { return -ENOSYS; }
 
 /* Possible settings for the migrate_page() method in address_operations */

-
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