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

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Message-ID: <5411B9BD.2000900@intel.com>
Date:	Thu, 11 Sep 2014 08:03:25 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Qiaowei Ren <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER,
 PR_MPX_UNREGISTER

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.
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