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mm/page_alloc.c: initialize num_movable in move_freepages()

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If move_freepages_block() 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.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Rientjes <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Greg Thelen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2018-10-26 15:09:24 -07:00 • committed by Linus Torvalds
commit 4a222127f3
1 changed files with 3 additions and 4 deletions
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7
mm/page_alloc.c
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@ -2021,10 +2021,6 @@ 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++;
@ -2064,6 +2060,9 @@ 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);