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

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Message-ID: <54A64E6D.1020304@linux.intel.com>
Date:	Thu, 01 Jan 2015 23:53:17 -0800
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API
 to arch_prctl

On 12/29/2014 04:52 PM, Andy Lutomirski wrote:
> This has the benefit the it avoids cluttering prctl with more
> arch-specific functionality.  The down side is that arch_prctl will
> need to be wired up as a 32-bit syscall to add 32-bit support for
> MPX.

There is existing userspace out there which depends on the existing
prctl() setup.  There isn't a _lot_ and it might still be able to be
changed easily, but this isn't a given.

I'll check in with the folks doing the gcc (runtime) part of this next
week and see what they think.
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