linux-kernel - Re: [RFC PATCH] kernfs: create raw version kernfs_path_len and kernfs

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Message-ID: <20160226151503.39d39e45@gandalf.local.home>
Date:	Fri, 26 Feb 2016 15:15:03 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Shi, Yang" <yang.shi@...aro.org>
Cc:	gregkh@...uxfoundation.org, tj@...nel.org, lizefan@...wei.com,
	tglx@...utronix.de, bigeasy@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [RFC PATCH] kernfs: create raw version kernfs_path_len and
 kernfs_path

On Fri, 26 Feb 2016 11:59:40 -0800
"Shi, Yang" <yang.shi@...aro.org> wrote:


> BTW, it sounds this is not the only point where kernfs_node could be 
> updated, __kernfs_remove should need synchronize_sched too.
> 

Question is, can the kernfs of a cgroup be removed while the cgroup is
still active?

I don't see the kernfs_rename_lock being held anywhere in that
remove. If it can be an issue there with this patch, then it's an issue
today, because the kernfs_mutex is not held by the tracepoint.

-- Steve