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Message-ID: <54137A79.6060602@intel.com> Date: Fri, 12 Sep 2014 15:58:01 -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 04/10] x86, mpx: hook #BR exception handler to allocate bound tables 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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