linux-kernel - Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX

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Message-ID: <52E5C18F.2060405@intel.com>
Date:	Mon, 27 Jan 2014 10:16:47 +0800
From:	Ren Qiaowei <qiaowei.ren@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE

On 01/27/2014 10:10 AM, H. Peter Anvin wrote:
> On 01/26/2014 05:55 PM, Ren Qiaowei wrote:
>>
>> Peter, you mean we should remove these two call and do what they do in
>> user-space, right?
>>
>
> Unless we think there is a benefit to the kernel to have a on/off switch
> for the #BR exception (if disabled, all #BR exceptions are signals,
> regardless of source.)
>
> There might be, would like other people's opinion.
>

These two syscalls are only used to release automaticlly the bound 
tables, and they will not set BNDSTATUS and BNDCFGU.

I want to remove them also. :) But if so, we have to release the bound 
tables in user-space.

Thanks,
Qiaowei
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