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

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Message-ID: <56D0B435.4080309@linaro.org>
Date:	Fri, 26 Feb 2016 12:23:17 -0800
From:	"Shi, Yang" <yang.shi@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.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 2/26/2016 12:15 PM, Steven Rostedt wrote:
> 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?

Hmm, it sounds unlikely to me.

Yang


>
> 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
>