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Commit bcc2b02f authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Linus Torvalds
Browse files

mm: cma: WARN if freed memory is still in use 



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.

[rientjes@google.com: support sparsemem]
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b66c5984

mm/page_alloc.c

+9 −2
Original line number Diff line number Diff line
@@ -5978,8 +5978,15 @@ done: 


void free_contig_range(unsigned long pfn, unsigned nr_pages)

{

	for (; nr_pages--; ++pfn)

		__free_page(pfn_to_page(pfn));

	unsigned int count = 0;



	for (; nr_pages--; pfn++) {

		struct page *page = pfn_to_page(pfn);



		count += page_count(page) != 1;

		__free_page(page);

	}

	WARN(count != 0, "%d pages are still in use!\n", count);

}

#endif