linux-kernel - RE: [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX

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Date:	Fri, 12 Sep 2014 03:10:37 +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 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER,
 PR_MPX_UNREGISTER



On 2014-09-11, Hansen, Dave wrote:
> On 09/11/2014 01:46 AM, Qiaowei Ren wrote:
>> +
>> +	return (void __user *)(unsigned long)(xsave_buf->bndcsr.cfg_reg_u &
>> +			MPX_BNDCFG_ADDR_MASK);
>> +}
> 
> I don't think casting a u64 to a ulong, then to a pointer is useful.
> Just take the '(unsigned long)' out.

If so, this will spits out a warning on 32-bit:

arch/x86/kernel/mpx.c: In function 'task_get_bounds_dir':
arch/x86/kernel/mpx.c:21:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

Thanks,
Qiaowei

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