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This member of struct virtio_chan is calculated from nr_free_buffer_pages so change its type to unsigned long in case of overflow. Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: David Miller <davem@davemloft.net> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>