Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752997Ab3IFVao (ORCPT ); Fri, 6 Sep 2013 17:30:44 -0400 Received: from mail-ie0-f177.google.com ([209.85.223.177]:44778 "EHLO mail-ie0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807Ab3IFVam (ORCPT ); Fri, 6 Sep 2013 17:30:42 -0400 From: behanw@converseincode.com To: linux@arm.linux.org.uk, Tejun Heo , Christoph Lameter Cc: behanw@converseincode.com, Mark Charlebois , linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/5] arm: LLVMLinux: use current_stack_pointer for percpu Date: Fri, 6 Sep 2013 17:28:08 -0400 Message-Id: <1378502899-1241-3-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1378502899-1241-1-git-send-email-behanw@converseincode.com> References: <1378502899-1241-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1580 Lines: 43 From: Behan Webster The existing code uses named registers to get the value of the stack pointer. The new current_stack_pointer macro is more readable and allows for a central portable implementation of how to get the stack pointer with ASM. This change supports being able to compile the kernel with both gcc and Clang. Signed-off-by: Mark Charlebois Signed-off-by: Behan Webster Reviewed-by: Jan-Simon Möller --- arch/arm/include/asm/percpu.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h index 209e650..629a975 100644 --- a/arch/arm/include/asm/percpu.h +++ b/arch/arm/include/asm/percpu.h @@ -30,14 +30,14 @@ static inline void set_my_cpu_offset(unsigned long off) static inline unsigned long __my_cpu_offset(void) { unsigned long off; - register unsigned long *sp asm ("sp"); + unsigned long sp = current_stack_pointer; /* * Read TPIDRPRW. * We want to allow caching the value, so avoid using volatile and * instead use a fake stack read to hazard against barrier(). */ - asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (*sp)); + asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (sp)); return off; } -- 1.8.1.2 -- 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/