linux-kernel - Re: [PATCH v3 4/4] mm: change to return bool for isolate_movable

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Date:   Thu, 16 Feb 2023 14:46:58 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Baolin Wang <baolin.wang@...ux.alibaba.com>,
        torvalds@...ux-foundation.org, sj@...nel.org, hannes@...xchg.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        muchun.song@...ux.dev, naoya.horiguchi@....com,
        linmiaohe@...wei.com, david@...hat.com, osalvador@...e.de,
        mike.kravetz@...cle.com, damon@...ts.linux.dev,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] mm: change to return bool for
 isolate_movable_page()

On Wed, 15 Feb 2023 15:44:22 +0000 Matthew Wilcox <willy@...radead.org> wrote:

> >  extern struct page *alloc_migration_target(struct page *page, unsigned long private);
> > -extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
> > +extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
> 
> You can drop the 'extern' here.

There are a bunch of them, so a separate patch would be better.


--- a/include/linux/migrate.h~a
+++ a/include/linux/migrate.h
@@ -62,16 +62,16 @@ extern const char *migrate_reason_names[
 
 #ifdef CONFIG_MIGRATION
 
-extern void putback_movable_pages(struct list_head *l);
+void putback_movable_pages(struct list_head *l);
 int migrate_folio_extra(struct address_space *mapping, struct folio *dst,
 		struct folio *src, enum migrate_mode mode, int extra_count);
 int migrate_folio(struct address_space *mapping, struct folio *dst,
 		struct folio *src, 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,
-		unsigned int *ret_succeeded);
-extern struct page *alloc_migration_target(struct page *page, unsigned long private);
-extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
+int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
+		  unsigned long private, enum migrate_mode mode, int reason,
+		  unsigned int *ret_succeeded);
+struct page *alloc_migration_target(struct page *page, unsigned long private);
+bool isolate_movable_page(struct page *page, isolate_mode_t mode);
 
 int migrate_huge_page_move_mapping(struct address_space *mapping,
 		struct folio *dst, struct folio *src);
@@ -142,8 +142,8 @@ const struct movable_operations *page_mo
 }
 
 #ifdef CONFIG_NUMA_BALANCING
-extern int migrate_misplaced_page(struct page *page,
-				  struct vm_area_struct *vma, int node);
+int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
+			   int node);
 #else
 static inline int migrate_misplaced_page(struct page *page,
 					 struct vm_area_struct *vma, int node)
_