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Message-ID: <alpine.DEB.2.10.1409120015030.4178@nanos> Date: Fri, 12 Sep 2014 00:18:15 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Qiaowei Ren <qiaowei.ren@...el.com> cc: "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...el.com>, x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound violation information On Thu, 11 Sep 2014, Qiaowei Ren wrote: > This patch sets bound violation fields of siginfo struct in #BR > exception handler by decoding the user instruction and constructing > the faulting pointer. > > This patch does't use the generic decoder, and implements a limited > special-purpose decoder to decode MPX instructions, simply because the > generic decoder is very heavyweight not just in terms of performance > but in terms of interface -- because it has to. And why is that an argument to add another special purpose decoder? If a bound violation happens it is completely irrelevant whether the decoder is heavyweight or not. So unless you come up with a convincing argument why the generic decoder is the wrong place, this won't happen. Thanks, tglx -- 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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