linux-kernel - Re: [PATCH 3/5] kernfs: Change kernfs_notify

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Date:   Thu, 5 May 2022 10:03:00 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Imran Khan <imran.f.khan@...cle.com>
Cc:     viro@...iv.linux.org.uk, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] kernfs: Change kernfs_notify_list to llist.

On Thu, Apr 28, 2022 at 03:54:29PM +1000, Imran Khan wrote:
> At present kernfs_notify_list is implemented as a singly linked
> list of kernfs_node(s), where last element points to itself and
> value of ->attr.next tells if node is present on the list or not.
> Both addition and deletion to list happen under kernfs_notify_lock.
> 
> Change kernfs_notify_list to llist so that addition to list can heppen
> locklessly. We still need kernfs_notify_lock for consumers (kernfs_notify\
> _workfn) because there can be multiple concurrent work items.
> 
> Suggested by: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Imran Khan <imran.f.khan@...cle.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun