From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751646AbcAXJ32 (ORCPT ); Sun, 24 Jan 2016 04:29:28 -0500 Received: from mail.skyhub.de ([78.46.96.112]:59257 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751045AbcAXJ3W (ORCPT ); Sun, 24 Jan 2016 04:29:22 -0500 From: Borislav Petkov To: "H. Peter Anvin" Cc: Andy Lutomirski , Brian Gerst , X86 ML , LKML Subject: [PATCH 4/6] x86/alternatives: Add an auxilary section Date: Sun, 24 Jan 2016 10:28:46 +0100 Message-Id: <1453627728-27197-5-git-send-email-bp@alien8.de> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1453627728-27197-1-git-send-email-bp@alien8.de> References: <1453627728-27197-1-git-send-email-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov Add .altinstr_aux for additional instructions which will be used before and/or during patching. All stuff which needs more sophisticated patching should go there. See next patch. Signed-off-by: Borislav Petkov --- arch/x86/kernel/vmlinux.lds.S | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 4f1994257a18..04afe9b7e52a 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -195,6 +195,17 @@ SECTIONS :init #endif + /* + * Section for code used exclusively before alternatives are run. All + * references to such code must be patched out by alternatives, normally + * by using X86_FEATURE_ALWAYS CPU feature bit. + * + * See static_cpu_has() for an example. + */ + .altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) { + *(.altinstr_aux) + } + INIT_DATA_SECTION(16) .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) { -- 2.3.5