From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932619AbdJZI3c (ORCPT ); Thu, 26 Oct 2017 04:29:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:40782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932531AbdJZI1m (ORCPT ); Thu, 26 Oct 2017 04:27:42 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 38C0B2193B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=luto@kernel.org From: Andy Lutomirski To: X86 ML Cc: Borislav Petkov , "linux-kernel@vger.kernel.org" , Brian Gerst , Dave Hansen , Linus Torvalds , Andy Lutomirski Subject: [PATCH 12/18] x86/asm: Add task_top_of_stack() to find the top of a task's stack Date: Thu, 26 Oct 2017 01:26:44 -0700 Message-Id: X-Mailer: git-send-email 2.13.6 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This will let us get rid of a few places that hardcode accesses to thread.sp0. Signed-off-by: Andy Lutomirski --- arch/x86/include/asm/processor.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 064b84722166..ad59cec14239 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -795,6 +795,8 @@ static inline void spin_lock_prefetch(const void *x) #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \ TOP_OF_KERNEL_STACK_PADDING) +#define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1)) + #ifdef CONFIG_X86_32 /* * User space process size: 3GB (default). -- 2.13.6