linux-kernel - Re: [PATCH v8 4/6] MCS Lock: Move mcs

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Message-ID: <20140121101915.GS31570@twins.programming.kicks-ass.net>
Date:	Tue, 21 Jan 2014 11:19:15 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Waiman Long <waiman.long@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Alex Shi <alex.shi@...aro.org>,
	Andi Kleen <andi@...stfloor.org>,
	Michel Lespinasse <walken@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Matthew R Wilcox <matthew.r.wilcox@...el.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	George Spelvin <linux@...izon.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	"Figo.zhang" <figo1802@...il.com>
Subject: Re: [PATCH v8 4/6] MCS Lock: Move mcs_lock/unlock function into its
 own

On Mon, Jan 20, 2014 at 05:24:31PM -0800, Tim Chen wrote:
> +EXPORT_SYMBOL_GPL(mcs_spin_lock);
> +EXPORT_SYMBOL_GPL(mcs_spin_unlock);

Do we really need the EXPORTs? The only user so far is mutex and that's
core code. The other planned users are rwsems and rwlocks, for both it
would be in the slow path, which is also core code.

We should generally only add EXPORTs once theres a need.
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