From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932802AbaH0Eai (ORCPT ); Wed, 27 Aug 2014 00:30:38 -0400 Received: from mail-pa0-f43.google.com ([209.85.220.43]:43483 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751050AbaH0E3y (ORCPT ); Wed, 27 Aug 2014 00:29:54 -0400 From: behanw@converseincode.com To: ard.biesheuvel@linaro.org, catalin.marinas@arm.com, cl@linux-foundation.org, jays.lee@samsung.com, k.khlebnikov@samsung.com, larry.bassel@linaro.org, olof@lixom.net, peterz@infradead.org, takahiro.akashi@linaro.org, tglx@linutronix.de, tj@kernel.org, will.deacon@arm.com Cc: christoffer.dall@linaro.org, kgene.kim@samsung.com, khilman@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, sungjinn.chung@samsung.com, Mark Charlebois , Behan Webster Subject: [PATCH V2 5/6] arm64: LLVMLinux: Use global stack register variable for aarch64 Date: Tue, 26 Aug 2014 21:29:33 -0700 Message-Id: <1409113774-3172-6-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1409113774-3172-1-git-send-email-behanw@converseincode.com> References: <20140826141608.GT23445@arm.com> <1409113774-3172-1-git-send-email-behanw@converseincode.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Charlebois To support both Clang and GCC, use the global stack register variable vs a local register variable. Author: Mark Charlebois Signed-off-by: Mark Charlebois Signed-off-by: Behan Webster --- arch/arm64/include/asm/percpu.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h index 453a179..5279e57 100644 --- a/arch/arm64/include/asm/percpu.h +++ b/arch/arm64/include/asm/percpu.h @@ -26,13 +26,13 @@ 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"); /* * We want to allow caching the value, so avoid using volatile and * instead use a fake stack read to hazard against barrier(). */ - asm("mrs %0, tpidr_el1" : "=r" (off) : "Q" (*sp)); + asm("mrs %0, tpidr_el1" : "=r" (off) : + "Q" (*(const unsigned long *)current_stack_pointer)); return off; } -- 1.9.1