linux-kernel - RE: [PATCH v8 04/10] x86, mpx: hook #BR exception handler to allocate bound tables

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Message-ID: <9E0BE1322F2F2246BD820DA9FC397ADE017A5821@shsmsx102.ccr.corp.intel.com>
Date:	Sat, 13 Sep 2014 07:24:02 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	"Hansen, Dave" <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v8 04/10] x86, mpx: hook #BR exception handler to
 allocate bound tables



On 2014-09-13, Hansen, Dave wrote:
> On 09/11/2014 01:46 AM, Qiaowei Ren wrote:
>> +static int allocate_bt(long __user *bd_entry) {
>> +	unsigned long bt_addr, old_val = 0;
>> +	int ret = 0;
>> +
>> +	bt_addr = mpx_mmap(MPX_BT_SIZE_BYTES);
>> +	if (IS_ERR((void *)bt_addr))
>> +		return bt_addr;
>> +	bt_addr = (bt_addr & MPX_BT_ADDR_MASK) |
> MPX_BD_ENTRY_VALID_FLAG;
> 
> Qiaowei, why do we need the "& MPX_BT_ADDR_MASK" here?

It should be not necessary, and can be removed.

Thanks,
Qiaowei
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