Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161045AbbEVP3X (ORCPT ); Fri, 22 May 2015 11:29:23 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:36260 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964874AbbEVP3W (ORCPT ); Fri, 22 May 2015 11:29:22 -0400 MIME-Version: 1.0 In-Reply-To: <15864413.ed8EFg1NLl@wuerfel> References: <1432161344-1930-1-git-send-email-stefan@agner.ch> <15864413.ed8EFg1NLl@wuerfel> Date: Fri, 22 May 2015 17:29:20 +0200 Message-ID: Subject: Re: [PATCH soc] ARM: use ARM_SINGLE_ARMV7M for ARMv7-M platforms From: Maxime Coquelin To: Arnd Bergmann Cc: "linux-arm-kernel@lists.infradead.org" , Stefan Agner , Russell King , manabian@gmail.com, "linux-kernel@vger.kernel.org" , =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= , olof@lixom.net Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1456 Lines: 36 2015-05-22 16:50 GMT+02:00 Arnd Bergmann : > [one small request as I have four armv7-m folks on Cc already: > could one of you try to fix the warning that I get with every > single build: "/git/arm-soc/arch/arm/kernel/head-nommu.S: Assembler > messages: /git/arm-soc/arch/arm/kernel/head-nommu.S:167: Warning: > Use of r13 as a source register is deprecated when r15 is the > destination register."] Moving r13 to r12 and returning r12 seems to do the job (see below). But I don't know if there is a more elegant way, and if it is also valid for other architectures than armv7-m. I can propose a patch if someone can confirm it is valid. Regards, Maxime ------------------------------------------------------------------------------------------------------------- diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index aebfbf7..e84bdad 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -164,7 +164,8 @@ __after_proc_init: #endif mcr p15, 0, r0, c1, c0, 0 @ write control reg #endif /* CONFIG_CPU_CP15 */ - ret r13 + mov r12, r13 + ret r12 ENDPROC(__after_proc_init) .ltorg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/