linux-kernel - [PATCH v2 01/10] mm/memory_hotplug: inline __offline_pages() into offline

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Date:   Wed, 19 Aug 2020 19:59:48 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v2 01/10] mm/memory_hotplug: inline __offline_pages() into offline_pages()

There is only a single user, offline_pages(). Let's inline, to make
it look more similar to online_pages().

Acked-by: Michal Hocko <mhocko@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
Cc: Baoquan He <bhe@...hat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
Cc: Oscar Salvador <osalvador@...e.de>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/memory_hotplug.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7f62d69660e06..c781d386d87f9 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1473,11 +1473,10 @@ static int count_system_ram_pages_cb(unsigned long start_pfn,
 	return 0;
 }
 
-static int __ref __offline_pages(unsigned long start_pfn,
-		  unsigned long end_pfn)
+int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 {
-	unsigned long pfn, nr_pages = 0;
-	unsigned long offlined_pages = 0;
+	const unsigned long end_pfn = start_pfn + nr_pages;
+	unsigned long pfn, system_ram_pages = 0, offlined_pages = 0;
 	int ret, node, nr_isolate_pageblock;
 	unsigned long flags;
 	struct zone *zone;
@@ -1494,9 +1493,9 @@ static int __ref __offline_pages(unsigned long start_pfn,
 	 * memory holes PG_reserved, don't need pfn_valid() checks, and can
 	 * avoid using walk_system_ram_range() later.
 	 */
-	walk_system_ram_range(start_pfn, end_pfn - start_pfn, &nr_pages,
+	walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages,
 			      count_system_ram_pages_cb);
-	if (nr_pages != end_pfn - start_pfn) {
+	if (system_ram_pages != nr_pages) {
 		ret = -EINVAL;
 		reason = "memory holes";
 		goto failed_removal;
@@ -1631,11 +1630,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
 	return ret;
 }
 
-int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
-{
-	return __offline_pages(start_pfn, start_pfn + nr_pages);
-}
-
 static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
 {
 	int ret = !is_memblock_offlined(mem);
-- 
2.26.2