From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757691AbbKFXMv (ORCPT ); Fri, 6 Nov 2015 18:12:51 -0500 Received: from mail.kernel.org ([198.145.29.136]:53571 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753249AbbKFXMu (ORCPT ); Fri, 6 Nov 2015 18:12:50 -0500 From: Andy Lutomirski To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Brian Gerst , Linus Torvalds , Borislav Petkov , =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Weisbecker?= , Peter Zijlstra , Andy Lutomirski Subject: [PATCH 0/4] x86 entry stuff, maybe for 4.4 Date: Fri, 6 Nov 2015 15:12:42 -0800 Message-Id: X-Mailer: git-send-email 2.4.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The first patch is a bit ugly, but it fixes a bug that could affect lockdep. That bug is very minor and may not be observable at all, but I don't really want to bet on it. The other three are intended to fix a performance regression in the entry rework that Frédéric objected to. They're much later than I'd like to have sent them for 4.4, but they're kind-of sort-of regression fixes, so maybe they're still okay. They would certainly need careful review, though. I don't have a great benchmark for them. The biggest impact is likely to be to user page fault latency on CONFIG_CONTEXT_TRACKING=y kernels (i.e. distro kernels) that don't use context tracking (i.e. most users). Andy Lutomirski (4): x86/entry/64: Fix irqflag tracing wrt context tracking context_tracking: Switch to new static_branch API x86/asm: Add asm macros for static keys/jump labels x86/entry/64: Bypass enter_from_user_mode on non-context-tracking boots arch/x86/entry/calling.h | 15 ++++++++++ arch/x86/entry/entry_64.S | 19 ++++++++----- arch/x86/include/asm/jump_label.h | 52 ++++++++++++++++++++++++++++------ include/linux/context_tracking_state.h | 4 +-- kernel/context_tracking.c | 4 +-- 5 files changed, 75 insertions(+), 19 deletions(-) -- 2.4.3