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SubjectRe: [PATCH] block: strip out locking optimization in put_io_context()
From
2012/2/10 Tejun Heo <tj@kernel.org>:
> Hello, Shaohua.
>
> Can you please test the following one?  It's probably the simplest
> version w/o RCU and wq deferring.  RCUfying isn't too bad but I'm
> still a bit hesitant because RCU coverage needs to be extended to
> request_queue via conditional synchronize_rcu() in queue exit path
> (can't enforce delayed RCU free on request_queues and unconditional
> synchronize_rcu() may cause excessive delay during boot for certain
> configurations).  It now can be done in the block core layer proper so
> it shouldn't be as bad tho.  If this too flops, I'll get to that.
doesn't work.
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