From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935064AbcCJDCr (ORCPT ); Wed, 9 Mar 2016 22:02:47 -0500 Received: from mail.kernel.org ([198.145.29.136]:51934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934935AbcCJDAw (ORCPT ); Wed, 9 Mar 2016 22:00:52 -0500 From: Andy Lutomirski To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Borislav Petkov , Oleg Nesterov , Andrew Cooper , Brian Gerst , Andy Lutomirski Subject: [PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed Date: Wed, 9 Mar 2016 19:00:31 -0800 Message-Id: <9dbd18429f9ff61a76b6eda97a9ea20510b9f6ba.1457578375.git.luto@kernel.org> X-Mailer: git-send-email 2.5.0 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 The SYSENTER stack is only used on 32-bit kernels. Remove it in 64-bit kernels. (We may end up using it down the road on 64-bit kernels. If so, we'll re-enable it for CONFIG_IA32_EMULATION.) 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 ecb410310e70..7cd01b71b5bd 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -297,10 +297,12 @@ struct tss_struct { */ unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; +#ifdef CONFIG_X86_32 /* * Space for the temporary SYSENTER stack: */ unsigned long SYSENTER_stack[64]; +#endif } ____cacheline_aligned; -- 2.5.0