linux-kernel - Re: [RFC V2 PATCH] kernfs: create raw version kernfs_path_len and kernfs

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Message-ID: <20160227085246.GC26010@infradead.org>
Date:	Sat, 27 Feb 2016 00:52:46 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	gregkh@...uxfoundation.org, tj@...nel.org, lizefan@...wei.com,
	tglx@...utronix.de, rostedt@...dmis.org, bigeasy@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [RFC V2 PATCH] kernfs: create raw version kernfs_path_len and
 kernfs_path

On Fri, Feb 26, 2016 at 01:47:39PM -0800, Yang Shi wrote:
> commit 5634cc2aa9aebc77bc862992e7805469dcf83dac ("writeback: update writeback
> tracepoints to report cgroup") made writeback tracepoints report cgroup
> writeback, but it may trigger the below bug on -rt kernel since kernfs_path
> and kernfs_path_len are called by tracepoints, which acquire sleeping lock.

Sounds like the tracepoints simplify shouldn't try to do this path
generation at all..