linux-kernel - Re: [PATCH 1/8] jump_label: no need to acquire the jump_label_mutex in jump_lable

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Message-ID: <20150820182903.GA3161@worktop.event.rightround.com>
Date:	Thu, 20 Aug 2015 20:29:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kevin Hao <haokexin@...il.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 1/8] jump_label: no need to acquire the jump_label_mutex
 in jump_lable_init()

On Thu, Aug 20, 2015 at 08:14:29PM +0800, Kevin Hao wrote:
> The jump_label_init() run in a very early stage, even before the
> sched_init(). So there is no chance for concurrent access of the
> jump label table.

It also doesn't hurt to have it. Its better to be consistent and
conservative with locking unless there is a pressing need.
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