linux-kernel - Re: [PATCH] drivers: nvme: target: core: Pass lockdep expression to RCU lists

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Date:   Sat, 11 Jan 2020 01:31:34 +0900
From:   Keith Busch <kbusch@...nel.org>
To:     Amol Grover <frextrite@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Joel Fernandes <joel@...lfernandes.org>,
        Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH] drivers: nvme: target: core: Pass lockdep expression to
 RCU lists

On Fri, Jan 10, 2020 at 06:53:58PM +0530, Amol Grover wrote:
> +#define subsys_lock_held() \
> +	lockdep_is_held(&subsys->lock)

This macro requires "struct nvmet_subsys *subsys" was previously declared
in the function using it, which isn't obvious when looking at the users. I
don't think that's worth the conciseness.

> @@ -555,7 +558,8 @@ int nvmet_ns_enable(struct nvmet_ns *ns)
>  	} else {
>  		struct nvmet_ns *old;
>  
> -		list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) {
> +		list_for_each_entry_rcu(old, &subsys->namespaces, dev_link,
> +							subsys_lock_held()) {
>  			BUG_ON(ns->nsid == old->nsid);
>  			if (ns->nsid < old->nsid)
>  				break;