Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 7 Jun 2018 20:41:42 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Andy Lutomirski <luto@kernel.org>
Cc:     Yu-cheng Yu <yu-cheng.yu@intel.com>,
        LKML <linux-kernel@vger.kernel.org>, linux-doc@vger.kernel.org,
        Linux-MM <linux-mm@kvack.org>,
        linux-arch <linux-arch@vger.kernel.org>, X86 ML <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. J. Lu" <hjl.tools@gmail.com>,
        "Shanbhogue, Vedvyas" <vedvyas.shanbhogue@intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Oleg Nesterov <oleg@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
        mike.kravetz@oracle.com
Subject: Re: [PATCH 02/10] x86/cet: Introduce WRUSS instruction
Message-ID: <20180607184142.GJ12217@hirez.programming.kicks-ass.net>
References: <20180607143807.3611-1-yu-cheng.yu@intel.com>
 <20180607143807.3611-3-yu-cheng.yu@intel.com>
 <CALCETrU45Cuzvfz3c1+-+7=9KS2N33Bpp1JqBtaGxhPo8U+Fqg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALCETrU45Cuzvfz3c1+-+7=9KS2N33Bpp1JqBtaGxhPo8U+Fqg@mail.gmail.com>
User-Agent: Mutt/1.9.5 (2018-04-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Jun 07, 2018 at 09:40:02AM -0700, Andy Lutomirski wrote:
> Peterz, isn't there some fancy better way we're supposed to handle the
> error return these days?

Don't think so. I played with a few things but that never really went
anywhere.

Also, both asm things look suspicously similar, it might make sense to
share. Also, maybe do the instruction .byte sequence in a #define INSN
or something.