From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751501Ab1JAVzs (ORCPT ); Sat, 1 Oct 2011 17:55:48 -0400 Received: from claw.goop.org ([74.207.240.146]:49160 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750820Ab1JAVzm (ORCPT ); Sat, 1 Oct 2011 17:55:42 -0400 From: Jeremy Fitzhardinge To: Steven Rostedt Cc: "David S. Miller" , David Daney , Michael Ellerman , Jan Glauber , Jason Baron , the arch/x86 maintainers , Xen Devel , Linux Kernel Mailing List , Jeremy Fitzhardinge Subject: [PATCH RFC V2 0/5] jump-label: allow early jump_label_enable() Date: Sat, 1 Oct 2011 14:55:32 -0700 Message-Id: X-Mailer: git-send-email 1.7.6.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeremy Fitzhardinge [ This is a new version of this series, which drops the need for any special _early() function in favour of making sure stop_machine() can operate correctly and efficiently in a pre-SMP envronment. ] While trying to use the jump-label stuff for my PV ticketlock changes, I had some problems using jump labels early in the kernel's lifetime (pre-SMP). The basic problem is that even if I enable a jump_label_key, the jump_label_init() initializer ends up nopping out all the code sites. This series enables early use of jump labels by making jump_label_init() respect already-enabled keys. To do this, I've dropped arch_jump_label_poke_text_early() and replaced it with arch_jump_label_transform(), allowing it to either insert an optimal nop, or leave the jump in place. Part of this series makes sure that stop_machine() is safe to call in an early pre-SMP environment, by making it just call the function with interrupts disabled. git://github.com/jsgf/linux-xen upstream/jump-label-noearly Jeremy Fitzhardinge (5): jump_label: use proper atomic_t initializer stop_machine: make stop_machine safe and efficient to call early jump_label: if a key has already been initialized, don't nop it out x86/jump_label: drop arch_jump_label_text_poke_early() sparc/jump_label: drop arch_jump_label_text_poke_early() arch/sparc/kernel/jump_label.c | 8 -------- arch/x86/kernel/jump_label.c | 6 ------ include/linux/jump_label.h | 7 ++++--- kernel/jump_label.c | 20 ++++++++------------ kernel/stop_machine.c | 21 +++++++++++++++++++++ 5 files changed, 33 insertions(+), 29 deletions(-) -- 1.7.6.2