[patch 179/192] mm/page_alloc: move free_the_page

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From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm/page_alloc: move free_the_page

Patch series "Allow high order pages to be stored on PCP", v2.

The per-cpu page allocator (PCP) only handles order-0 pages.  With the
series "Use local_lock for pcp protection and reduce stat overhead" and
"Calculate pcp->high based on zone sizes and active CPUs", it's now
feasible to store high-order pages on PCP lists.

This small series allows PCP to store "cheap" orders where cheap is
determined by PAGE_ALLOC_COSTLY_ORDER and THP-sized allocations.


This patch (of 2):

In the next page, free_compount_page is going to use the common helper
free_the_page.  This patch moves the definition to ease review.  No
functional change.

Link: https://lkml.kernel.org/r/20210603142220.10851-1-mgorman@xxxxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20210603142220.10851-2-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/page_alloc.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/mm/page_alloc.c~mm-page_alloc-move-free_the_page
+++ a/mm/page_alloc.c
@@ -687,6 +687,14 @@ out:
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 }
 
+static inline void free_the_page(struct page *page, unsigned int order)
+{
+	if (order == 0)		/* Via pcp? */
+		free_unref_page(page);
+	else
+		__free_pages_ok(page, order, FPI_NONE);
+}
+
 /*
  * Higher-order pages are called "compound pages".  They are structured thusly:
  *
@@ -5349,14 +5357,6 @@ unsigned long get_zeroed_page(gfp_t gfp_
 }
 EXPORT_SYMBOL(get_zeroed_page);
 
-static inline void free_the_page(struct page *page, unsigned int order)
-{
-	if (order == 0)		/* Via pcp? */
-		free_unref_page(page);
-	else
-		__free_pages_ok(page, order, FPI_NONE);
-}
-
 /**
  * __free_pages - Free pages allocated with alloc_pages().
  * @page: The page pointer returned from alloc_pages().
_



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