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Date:   Fri, 5 Oct 2018 13:56:39 -0700 (PDT)
From:   David Rientjes <rientjes@google.com>
To:     Andrew Morton <akpm@linux-foundation.org>
cc:     Vlastimil Babka <vbabka@suse.cz>, Greg Thelen <gthelen@google.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [patch] mm, page_alloc: set num_movable in move_freepages()
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If move_freepages() returns 0 because zone_spans_pfn(), *num_movable can
hold the value from the stack because it does not get initialized in
move_freepages().

Move the initialization to move_freepages_block() to guarantee the value
actually makes sense.

This currently doesn't affect its only caller where num_movable != NULL,
so no bug fix, but just more robust.

Signed-off-by: David Rientjes <rientjes@google.com>
---
 mm/page_alloc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2015,10 +2015,6 @@ static int move_freepages(struct zone *zone,
 	          pfn_valid(page_to_pfn(end_page)) &&
 	          page_zone(start_page) != page_zone(end_page));
 #endif
-
-	if (num_movable)
-		*num_movable = 0;
-
 	for (page = start_page; page <= end_page;) {
 		if (!pfn_valid_within(page_to_pfn(page))) {
 			page++;
@@ -2058,6 +2054,9 @@ int move_freepages_block(struct zone *zone, struct page *page,
 	unsigned long start_pfn, end_pfn;
 	struct page *start_page, *end_page;
 
+	if (num_movable)
+		*num_movable = 0;
+
 	start_pfn = page_to_pfn(page);
 	start_pfn = start_pfn & ~(pageblock_nr_pages-1);
 	start_page = pfn_to_page(start_pfn);