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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:51660) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1h2CCf-00036j-8T; Fri, 08 Mar 2019 09:54:09 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.89) (envelope-from ) id 1h2CCd-0005fh-JL; Fri, 08 Mar 2019 09:54:07 +0000 Date: Fri, 8 Mar 2019 09:54:07 +0000 From: Russell King - ARM Linux admin To: Nick Desaulniers Subject: Re: [PATCH 2/2] ARM: futex: make futex_detect_cmpxchg more reliable Message-ID: <20190308095407.zfezalaysgjialpy@shell.armlinux.org.uk> References: <20190307091514.2489338-1-arnd@arndb.de> <20190307091514.2489338-2-arnd@arndb.de> <20190307234850.nsbpkfcit3lnmytu@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190308_015422_644534_C2F10631 X-CRM114-Status: GOOD ( 13.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mikael Pettersson , Mikael Pettersson , Arnd Bergmann , Peter Zijlstra , LKML , Ingo Molnar , Darren Hart , Thomas Gleixner , Dave Martin , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Mar 07, 2019 at 04:04:23PM -0800, Nick Desaulniers wrote: > On Thu, Mar 7, 2019 at 3:49 PM Russell King - ARM Linux admin > wrote: > > > > On Thu, Mar 07, 2019 at 11:39:08AM -0800, Nick Desaulniers wrote: > > > Underspecification of constraints to extended inline assembly is a > > > common issue exposed by other compilers (and possibly but in-effect > > > infrequently compiler upgrades). > > > > I don't see what is "underspecified" in the original constraints. > > Please explain. > > From the link: > > The problem is that in the T(streq) insn, %3 and %4 MUST be different registers, > but nothing in the asm() constrains them to be different. Thanks, but that is not what I'm asking. See my reply to Ard. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel