From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1760175AbdKPQnf (ORCPT <rfc822;w@1wt.eu>);
        Thu, 16 Nov 2017 11:43:35 -0500
Received: from mail-it0-f66.google.com ([209.85.214.66]:37632 "EHLO
        mail-it0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S936094AbdKPQnL (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 16 Nov 2017 11:43:11 -0500
X-Google-Smtp-Source: AGs4zMZ2F8zhsxDt0CsavbihhWffW5AwL3foF7TfFgA74T1sY9+IN+IZdtIZHN353YN1GrgBQhsSiw==
Date: Thu, 16 Nov 2017 08:43:06 -0800
From: Sami Tolvanen <samitolvanen@google.com>
To: Will Deacon <will.deacon@arm.com>
Cc: Alex Matveev <alxmtvv@gmail.com>, Andi Kleen <ak@linux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Greg Hackmann <ghackmann@google.com>,
        Kees Cook <keescook@chromium.org>,
        linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Yury Norov <ynorov@caviumnetworks.com>,
        Matthias Kaehlcke <mka@chromium.org>
Subject: Re: [PATCH v2 11/18] arm64: make mrs_s and msr_s macros work with LTO
Message-ID: <20171116164306.GF94341@samitolvanen.mtv.corp.google.com>
References: <20171115213428.22559-1-samitolvanen@google.com>
 <20171115213428.22559-12-samitolvanen@google.com>
 <20171116115433.GG9361@arm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20171116115433.GG9361@arm.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, Nov 16, 2017 at 11:54:33AM +0000, Will Deacon wrote:
> What limitations? Can you elaborate please? Is this a fix?

The commit message in v1 was more informative, I'll change this back for v3:

--

Clang's integrated assembler does not allow assembly macros defined
in one inline asm block using the .macro directive to be used across
separate asm blocks. LLVM developers consider this a feature and not a
bug, recommending code refactoring:

https://bugs.llvm.org/show_bug.cgi?id=19749

As binutils doesn't allow macros to be redefined, this change adds C
preprocessor macros that define the assembly macros globally for binutils
and locally for clang's integrated assembler.

Sami