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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id 67-v6sm1729590wmd.1.2018.10.05.05.52.43 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 05 Oct 2018 05:52:44 -0700 (PDT) Date: Fri, 5 Oct 2018 14:52:41 +0200 From: Ingo Molnar To: Borislav Petkov Cc: Nadav Amit , "hpa@zytor.com" , Ingo Molnar , "linux-kernel@vger.kernel.org" , "x86@kernel.org" , Thomas Gleixner , Jan Beulich , Josh Poimboeuf , Linus Torvalds , Peter Zijlstra , Andy Lutomirski Subject: Re: [PATCH v9 04/10] x86: refcount: prevent gcc distortions Message-ID: <20181005125241.GA4671@gmail.com> References: <20181004075755.GA3353@gmail.com> <20181004083333.GA9802@gmail.com> <10D29A50-C352-4407-A824-0C3C06CD8592@zytor.com> <20181004091222.GB21864@gmail.com> <20181004094519.GA97692@gmail.com> <29591D3B-D49B-4D7A-B280-85A2C3F63F9C@vmware.com> <20181005093108.GA24723@gmail.com> <20181005112010.GC10285@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181005112010.GC10285@zn.tnic> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Borislav Petkov wrote: > On Fri, Oct 05, 2018 at 11:31:08AM +0200, Ingo Molnar wrote: > > > > * Nadav Amit wrote: > > > > > > Are you using defconfig or a reasonable distro-config for your tests? > > > > > > I think it is best to take the kernel and run localyesconfig for testing. > > > > Ok, agreed - and this makes the numbers you provided pretty representative. > > > > Good - now that all of my concerns were addressed I'd like to merge the remaining 3 patches as > > well - but they are conflicting with ongoing x86 work in tip:x86/core. The extable conflict is > > trivial, the jump-label conflict a bit more involved. > > FWIW, gcc guys are not too averse to the idea of enhancing gcc inline > asm syntax with a statement which specifies its size so that gcc can use > it to do better inlining cost estimation than counting lines. > > Lemme work the process ... Thanks! Ingo