blk-mq: realloc hctx when hw queue is mapped to another node
When the hw queues and mq_map are updated, a hctx could be mapped to a different numa node. At this moment, we need to realloc the hctx. If fail to do that, go on using previous hctx. Signed-off-by: NJianchao Wang <jianchao.w.wang@oracle.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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