Memory return to free_contig_range() must have no other references. Let
kernel to complain loudly if page reference count is not equal to 1.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
CC: Michal Nazarewicz <mina86@xxxxxxxxxx>
---
mm/page_alloc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 022e4ed..290c2eb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5888,8 +5888,13 @@ done:
void free_contig_range(unsigned long pfn, unsigned nr_pages)
{
- for (; nr_pages--; ++pfn)
- __free_page(pfn_to_page(pfn));
+ struct page *page = pfn_to_page(pfn);
+ int refcount = nr_pages;
+ for (; nr_pages--; page++) {
+ refcount -= page_count(page) == 1;
+ __free_page(page);
+ }
+ WARN(refcount != 0, "some pages are still in use!\n");
}
#endif
--
1.7.9.5
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