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[209.85.167.49]) by smtp.gmail.com with ESMTPSA id g21sm425209lfb.73.2019.03.06.09.59.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Mar 2019 09:59:28 -0800 (PST) Received: by mail-lf1-f49.google.com with SMTP id a8so9611200lfi.7 for ; Wed, 06 Mar 2019 09:59:28 -0800 (PST) X-Received: by 2002:a19:48cb:: with SMTP id v194mr4748710lfa.166.1551895167718; Wed, 06 Mar 2019 09:59:27 -0800 (PST) MIME-Version: 1.0 References: <20190228145450.289603901@infradead.org> <20190228150152.078767622@infradead.org> <20190301144556.GY32477@hirez.programming.kicks-ass.net> <20190301152305.GJ32494@hirez.programming.kicks-ass.net> <20190306131347.GX32534@hirez.programming.kicks-ass.net> <20190306171451.GZ32534@hirez.programming.kicks-ass.net> <20190306173715.GA32534@hirez.programming.kicks-ass.net> In-Reply-To: <20190306173715.GA32534@hirez.programming.kicks-ass.net> From: Linus Torvalds Date: Wed, 6 Mar 2019 09:59:11 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/8] kasan,x86: Frob kasan_report() in an exception To: Peter Zijlstra Cc: Dmitry Vyukov , Thomas Gleixner , "H. Peter Anvin" , Julien Thierry , Will Deacon , Andy Lutomirski , Ingo Molnar , Catalin Marinas , James Morse , valentin.schneider@arm.com, Brian Gerst , Josh Poimboeuf , Andy Lutomirski , Borislav Petkov , Denys Vlasenko , LKML , Andrey Ryabinin , Juergen Gross Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 6, 2019 at 9:37 AM Peter Zijlstra wrote: > > The below seems to 'work'. Yeah, and makes things cheaper for the non-SMAP case too. Looks sane. One note: + asm volatile (ALTERNATIVE("", "pushf; pop %0; " __stringify(__ASM_CLAC), Hmm. Every single use of __ASM_CLAC is together with "__stringity()". Maybe we could just get rid of that oddity, and just make __ASM_CLAC be a string to begin with. At one point it was used bare in the __ASSEMBLY__ version, but that does not appear to the case any more since commit 669f8a900198 ("x86/smap: Use ALTERNATIVE macro") back in 2015. Linus