mm/migrate: move migration helper from .h to .c

It's not performance sensitive function.  Move it to .c.  This is a
preparation step for future change.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Roman Gushchin <guro@fb.com>
Link: http://lkml.kernel.org/r/1594622517-20681-3-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 540998d..abeb4b1 100644 (file)
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -31,34 +31,6 @@ enum migrate_reason {
 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
 extern const char *migrate_reason_names[MR_TYPES];
 
-static inline struct page *new_page_nodemask(struct page *page,
-                               int preferred_nid, nodemask_t *nodemask)
-{
-       gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
-       unsigned int order = 0;
-       struct page *new_page = NULL;
-
-       if (PageHuge(page))
-               return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
-                               preferred_nid, nodemask);
-
-       if (PageTransHuge(page)) {
-               gfp_mask |= GFP_TRANSHUGE;
-               order = HPAGE_PMD_ORDER;
-       }
-
-       if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
-               gfp_mask |= __GFP_HIGHMEM;
-
-       new_page = __alloc_pages_nodemask(gfp_mask, order,
-                               preferred_nid, nodemask);
-
-       if (new_page && PageTransHuge(new_page))
-               prep_transhuge_page(new_page);
-
-       return new_page;
-}
-
 #ifdef CONFIG_MIGRATION
 
 extern void putback_movable_pages(struct list_head *l);
@@ -67,6 +39,8 @@ extern int migrate_page(struct address_space *mapping,
                        enum migrate_mode mode);
 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
                unsigned long private, enum migrate_mode mode, int reason);
+extern struct page *new_page_nodemask(struct page *page,
+               int preferred_nid, nodemask_t *nodemask);
 extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
 extern void putback_movable_page(struct page *page);
 
@@ -85,6 +59,9 @@ static inline int migrate_pages(struct list_head *l, new_page_t new,
                free_page_t free, unsigned long private, enum migrate_mode mode,
                int reason)
        { return -ENOSYS; }
+static inline struct page *new_page_nodemask(struct page *page,
+               int preferred_nid, nodemask_t *nodemask)
+       { return NULL; }
 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
        { return -EBUSY; }
 

diff --git a/mm/migrate.c b/mm/migrate.c
index 52896b4..5269bc5 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1538,6 +1538,35 @@ out:
        return rc;
 }
 
+struct page *new_page_nodemask(struct page *page,
+                               int preferred_nid, nodemask_t *nodemask)
+{
+       gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
+       unsigned int order = 0;
+       struct page *new_page = NULL;
+
+       if (PageHuge(page))
+               return alloc_huge_page_nodemask(
+                               page_hstate(compound_head(page)),
+                               preferred_nid, nodemask);
+
+       if (PageTransHuge(page)) {
+               gfp_mask |= GFP_TRANSHUGE;
+               order = HPAGE_PMD_ORDER;
+       }
+
+       if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
+               gfp_mask |= __GFP_HIGHMEM;
+
+       new_page = __alloc_pages_nodemask(gfp_mask, order,
+                               preferred_nid, nodemask);
+
+       if (new_page && PageTransHuge(new_page))
+               prep_transhuge_page(new_page);
+
+       return new_page;
+}
+
 #ifdef CONFIG_NUMA
 
 static int store_status(int __user *status, int start, int value, int nr)