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: NMarek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: NKyungmin Park <kyungmin.park@samsung.com> Acked-by: NMichal Nazarewicz <mina86@mina86.com> Signed-off-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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