linux-kernel - Re: [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX

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Date:	Wed, 17 Sep 2014 23:20:59 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Kevin Easton <kevin@...rana.org>
CC:	"Ren, Qiaowei" <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER,
 PR_MPX_UNREGISTER

On 09/18/2014 12:17 AM, Kevin Easton wrote:
> I was assuming that if an application did want to enable MPX after threads
> had already been created, it would generally want to enable it
> simultaneously across all threads.  This would be a lot easier for the
> kernel than for the application.

The current gcc setup mechanism would set up MPX even before main().  So
I think it's pretty unlikely that help is needed to coordinate threads.
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