linux-kernel - [PATCH 13/14] mm/page_alloc: Move prototype for find_suitable

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Date:   Thu, 20 May 2021 09:48:08 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Streetman <ddstreet@...e.org>,
        Yang Shi <shy828301@...il.com>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 13/14] mm/page_alloc: Move prototype for find_suitable_fallback

make W=1 generates the following warning in mmap_lock.c for allnoconfig

  mm/page_alloc.c:2670:5: warning: no previous prototype for ‘find_suitable_fallback’ [-Wmissing-prototypes]
   int find_suitable_fallback(struct free_area *area, unsigned int order,
       ^~~~~~~~~~~~~~~~~~~~~~

find_suitable_fallback is only shared outside of page_alloc.c for
CONFIG_COMPACTION but to suppress the warning, move the protype
outside of CONFIG_COMPACTION. It is not worth the effort at
this time to find a clever way of allowing compaction.c to share
the code or avoid the use entirely as the function is called
on relatively slow paths.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/internal.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 54bd0dc2c23c..bc9890948712 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -289,11 +289,10 @@ isolate_freepages_range(struct compact_control *cc,
 int
 isolate_migratepages_range(struct compact_control *cc,
 			   unsigned long low_pfn, unsigned long end_pfn);
+#endif
 int find_suitable_fallback(struct free_area *area, unsigned int order,
 			int migratetype, bool only_stealable, bool *can_steal);
 
-#endif
-
 /*
  * This function returns the order of a free page in the buddy system. In
  * general, page_zone(page)->lock must be held by the caller to prevent the
-- 
2.26.2