mm/page_alloc: remove nr_free_pagecache_pages()

nr_free_pagecache_pages() isn't used outside page_alloc.c anymore - and
the name does not really help to understand what's going on.  Let's
open-code it instead and add a comment.

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Huang Ying <ying.huang@intel.com>
Link: http://lkml.kernel.org/r/20200619132410.23859-3-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4ab2366..7eb59bc 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -328,7 +328,6 @@ void workingset_update_node(struct xa_node *node);
 /* linux/mm/page_alloc.c */
 extern unsigned long totalreserve_pages;
 extern unsigned long nr_free_buffer_pages(void);
-extern unsigned long nr_free_pagecache_pages(void);
 
 /* Definition of global_zone_page_state not available yet */
 #define nr_free_pages() global_zone_page_state(NR_FREE_PAGES)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 20184e2..ba09a3a 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5186,19 +5186,6 @@ unsigned long nr_free_buffer_pages(void)
 }
 EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
 
-/**
- * nr_free_pagecache_pages - count number of pages beyond high watermark
- *
- * nr_free_pagecache_pages() counts the number of pages which are beyond the
- * high watermark within all zones.
- *
- * Return: number of pages beyond high watermark within all zones.
- */
-unsigned long nr_free_pagecache_pages(void)
-{
-       return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE));
-}
-
 static inline void show_node(struct zone *zone)
 {
        if (IS_ENABLED(CONFIG_NUMA))
@@ -5920,7 +5907,8 @@ void __ref build_all_zonelists(pg_data_t *pgdat)
                __build_all_zonelists(pgdat);
                /* cpuset refresh routine should be here */
        }
-       vm_total_pages = nr_free_pagecache_pages();
+       /* Get the number of free pages beyond high watermark in all zones. */
+       vm_total_pages = nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE));
        /*
         * Disable grouping by mobility if the number of pages in the
         * system is too low to allow the mechanism to work. It would be