linux-kernel - Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch

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Message-ID: <CALCETrUpR6ZCBSXdbY232inK=LaXLK0LAssqUt+r8DAn9=xjJg@mail.gmail.com>
Date:	Tue, 6 Jan 2015 13:34:56 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Dave Hansen <dave.hansen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	ilya.enkovich@...el.com
Subject: Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch_prctl

On Tue, Jan 6, 2015 at 1:22 PM, Andi Kleen <andi@...stfloor.org> wrote:
>> Given that it doesn't seen to have been committed yet, I'm not too
>> worried about compatibility.  And "prctl (43)" doesn't actually seem a
>> whole lot better than "syscall(SYS_arch_prctl, ARCH_ENABLE_MPX, 0)"
>
> This would actually fail with the EINVAL change you requested.
>

So the libmpx code needs to change anyway, then, right?  I really
don't think we should accept garbage in the extra prctl slots just
because uncommitted code somewhere fails to initialize them.

--Andy

>> (preprocessor macros ftw!).  But I don't feel that strongly about this
>> point.
>
> -Andi



-- 
Andy Lutomirski
AMA Capital Management, LLC
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