Re: [PATCH 13/14] blk-mq: Remove generation seqeunce

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On Wed, May 23, 2018 at 02:19:40PM +0200, Christoph Hellwig wrote:
> -static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx)
> -	__releases(hctx->srcu)
> -{
> -	if (!(hctx->flags & BLK_MQ_F_BLOCKING))
> -		rcu_read_unlock();
> -	else
> -		srcu_read_unlock(hctx->srcu, srcu_idx);
> -}
> -
> -static void hctx_lock(struct blk_mq_hw_ctx *hctx, int *srcu_idx)
> -	__acquires(hctx->srcu)
> -{
> -	if (!(hctx->flags & BLK_MQ_F_BLOCKING)) {
> -		/* shut up gcc false positive */
> -		*srcu_idx = 0;
> -		rcu_read_lock();
> -	} else
> -		*srcu_idx = srcu_read_lock(hctx->srcu);
> -}

I may have too ambitious on removing hctx_lock. That's actually nothing
to do with the completion issues, but it is necessary for quiesce to
work reliably. Otherwise, I still think there is some promise to the
reset of the approach.



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