Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752745AbcDRCal (ORCPT ); Sun, 17 Apr 2016 22:30:41 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:35699 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752542AbcDRCah (ORCPT ); Sun, 17 Apr 2016 22:30:37 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Morton , Michal Marek , kvm@vger.kernel.org, Linda Walsh , Paolo Bonzini Subject: [PATCH 4.5 019/124] compiler-gcc: disable -ftracer for __noclone functions Date: Mon, 18 Apr 2016 11:28:11 +0900 Message-Id: <20160418022616.721482901@linuxfoundation.org> X-Mailer: git-send-email 2.8.0 In-Reply-To: <20160418022615.726954227@linuxfoundation.org> References: <20160418022615.726954227@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1223 Lines: 42 4.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Paolo Bonzini commit 95272c29378ee7dc15f43fa2758cb28a5913a06d upstream. -ftracer can duplicate asm blocks causing compilation to fail in noclone functions. For example, KVM declares a global variable in an asm like asm("2: ... \n .pushsection data \n .global vmx_return \n vmx_return: .long 2b"); and -ftracer causes a double declaration. Cc: Andrew Morton Cc: Michal Marek Cc: kvm@vger.kernel.org Reported-by: Linda Walsh Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- include/linux/compiler-gcc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -199,7 +199,7 @@ #define unreachable() __builtin_unreachable() /* Mark a function definition as prohibited from being cloned. */ -#define __noclone __attribute__((__noclone__)) +#define __noclone __attribute__((__noclone__, __optimize__("no-tracer"))) #endif /* GCC_VERSION >= 40500 */