linux-kernel - RE: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

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Date:	Tue, 24 Jun 2014 02:53:12 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Hansen, Dave" <dave.hansen@...el.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: RE: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

On 2014-06-24, Andy Lutomirski wrote:
>> +	/* Make bounds tables and bouds directory unlocked. */
>> +	if (vm_flags & VM_LOCKED)
>> +		vm_flags &= ~VM_LOCKED;
> 
> Why?  I would expect MCL_FUTURE to lock these.
> 
Andy, I was just a little confused about LOCKED & POPULATE earlier and I thought VM_LOCKED is not necessary for MPX specific bounds tables. Now, this checking should be removed, and there should be mm_populate() for VM_LOCKED case after mmap_region():

   if (!IS_ERR_VALUE(addr) && (vm_flags & VM_LOCKED))
       mm_populate(addr, len);

Thanks,
Qiaowei

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