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[ Upstream commit82734209be] The number of allocated pages which discarded will not decrease. Fix it. Fixes:9ead7efc6f("brd: implement discard support") Signed-off-by: Zhang Xianwei <zhang.xianwei8@zte.com.cn> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20241128170056565nPKSz2vsP8K8X2uk2iaDG@zte.com.cn Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>