Memory returned 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@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 count = 0;
+ for (; nr_pages--; page++) {
+ count += page_count(page) != 1;
+ __free_page(page);
+ }
+ WARN(count != 0, "%d pages are still in use!\n", count);
}
#endif