Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754009AbbBZXwP (ORCPT ); Thu, 26 Feb 2015 18:52:15 -0500 Received: from mail-pa0-f46.google.com ([209.85.220.46]:36779 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753862AbbBZXwO (ORCPT ); Thu, 26 Feb 2015 18:52:14 -0500 From: Andy Lutomirski To: Denys Vlasenko , linux-kernel@vger.kernel.org Cc: x86@kernel.org, Borislav Petkov , Andy Lutomirski Subject: [RFC 0/3] Baby steps toward cleaning up KERNEL_STACK_OFFSET Date: Thu, 26 Feb 2015 15:52:08 -0800 Message-Id: X-Mailer: git-send-email 2.1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1374 Lines: 36 Denys is right that KERNEL_STACK_OFFSET is a mess. Let's start fixing it. This removes all C code that *reads* kernel_stack. It also fixes the KERNEL_STACK_OFFSET abomination in ia32_sysenter_target. It does not fix the KERNEL_STACK_OFFSET abomination in GET_THREAD_INFO and THREAD_INFO. I think that should be its own patch. It also doesn't change the two syscall targets. To fix them, we should make a decision. Either we should make KERNEL_STACK_OFFSET have the correct nonzero value to save an instruction or we should get rid of kernel_stack entirely. Andy Lutomirski (3): x86: Add this_cpu_sp0() to read sp0 for the current cpu x86: Switch all C consumers of kernel_stack to this_cpu_sp0 x86, asm: Change the 32-bit sysenter code to use sp0 arch/x86/ia32/ia32entry.S | 3 +-- arch/x86/include/asm/processor.h | 5 +++++ arch/x86/include/asm/thread_info.h | 3 +-- arch/x86/kernel/asm-offsets_64.c | 1 + arch/x86/kernel/traps.c | 2 +- arch/x86/lguest/boot.c | 1 + arch/x86/xen/enlighten.c | 1 + 7 files changed, 11 insertions(+), 5 deletions(-) -- 2.1.0 -- 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/