linux-kernel - Re: [PATCH 2/5] x86, mpx: do not set ->vm

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Date:	Mon, 13 Jul 2015 10:05:45 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Oleg Nesterov <oleg@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/5] x86, mpx: do not set ->vm_ops on mpx VMAs

On 07/13/2015 09:53 AM, Oleg Nesterov wrote:
> On 07/13, Kirill A. Shutemov wrote:
>>
>> We don't really need ->vm_ops here: MPX VMA can be detected with VM_MPX
>> flag. And vma_merge() will not merge MPX VMA with non-MPX VMA, because
>> ->vm_flags won't match.
> 
> Agreed.
> 
> I am wondering if something like the patch below (on top of yours) makes
> sense... Not sure, but mpx_mmap() doesn't look nice too, and with this
> change we can unexport mmap_region().

These both look nice to me (and they both cull specialty MPX code which
is excellent).  I'll run them through a quick test.


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