From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754277Ab1ELCf3 (ORCPT ); Wed, 11 May 2011 22:35:29 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:62732 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751626Ab1ELCf2 (ORCPT ); Wed, 11 May 2011 22:35:28 -0400 Message-ID: <4DCB4827.4030609@cn.fujitsu.com> Date: Thu, 12 May 2011 10:38:31 +0800 From: Lai Jiangshan User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc14 Thunderbird/3.1.4 MIME-Version: 1.0 To: Doug Thompson , EDAC-CORE , linux-kernel@vger.kernel.org CC: "Paul E. McKenney" , Andrew Morton Subject: [PATCH] edac,rcu: use synchronize_rcu() instead of call_rcu()+rcu_barrier() X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-05-12 10:35:37, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-05-12 10:35:38, Serialize complete at 2011-05-12 10:35:38 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org synchronize_rcu() does the stuff as needed. Signed-off-by: Lai Jiangshan --- drivers/edac/edac_core.h | 12 ------------ drivers/edac/edac_device.c | 24 ++++++------------------ drivers/edac/edac_mc.c | 16 ++++++---------- drivers/edac/edac_pci.c | 21 ++++++--------------- 4 files changed, 18 insertions(+), 55 deletions(-) diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h index eefa350..55b8278 100644 --- a/drivers/edac/edac_core.h +++ b/drivers/edac/edac_core.h @@ -421,10 +421,6 @@ struct mem_ctl_info { u32 ce_count; /* Total Correctable Errors for this MC */ unsigned long start_time; /* mci load start time (in jiffies) */ - /* this stuff is for safe removal of mc devices from global list while - * NMI handlers may be traversing list - */ - struct rcu_head rcu; struct completion complete; /* edac sysfs device control */ @@ -620,10 +616,6 @@ struct edac_device_ctl_info { unsigned long start_time; /* edac_device load start time (jiffies) */ - /* these are for safe removal of mc devices from global list while - * NMI handlers may be traversing list - */ - struct rcu_head rcu; struct completion removal_complete; /* sysfs top name under 'edac' directory @@ -722,10 +714,6 @@ struct edac_pci_ctl_info { unsigned long start_time; /* edac_pci load start time (jiffies) */ - /* these are for safe removal of devices from global list while - * NMI handlers may be traversing list - */ - struct rcu_head rcu; struct completion complete; /* sysfs top name under 'edac' directory diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index a7408cf..c3f6743 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -346,30 +346,18 @@ fail1: } /* - * complete_edac_device_list_del - * - * callback function when reference count is zero - */ -static void complete_edac_device_list_del(struct rcu_head *head) -{ - struct edac_device_ctl_info *edac_dev; - - edac_dev = container_of(head, struct edac_device_ctl_info, rcu); - INIT_LIST_HEAD(&edac_dev->link); -} - -/* * del_edac_device_from_global_list - * - * remove the RCU, setup for a callback call, - * then wait for the callback to occur */ static void del_edac_device_from_global_list(struct edac_device_ctl_info *edac_device) { list_del_rcu(&edac_device->link); - call_rcu(&edac_device->rcu, complete_edac_device_list_del); - rcu_barrier(); + + /* these are for safe removal of devices from global list while + * NMI handlers may be traversing list + */ + synchronize_rcu(); + INIT_LIST_HEAD(&edac_device->link); } /* diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c index 1d80560..d69144a 100644 --- a/drivers/edac/edac_mc.c +++ b/drivers/edac/edac_mc.c @@ -447,20 +447,16 @@ fail1: return 1; } -static void complete_mc_list_del(struct rcu_head *head) -{ - struct mem_ctl_info *mci; - - mci = container_of(head, struct mem_ctl_info, rcu); - INIT_LIST_HEAD(&mci->link); -} - static void del_mc_from_global_list(struct mem_ctl_info *mci) { atomic_dec(&edac_handlers); list_del_rcu(&mci->link); - call_rcu(&mci->rcu, complete_mc_list_del); - rcu_barrier(); + + /* these are for safe removal of devices from global list while + * NMI handlers may be traversing list + */ + synchronize_rcu(); + INIT_LIST_HEAD(&mci->link); } /** diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c index efb5d56..2b378207 100644 --- a/drivers/edac/edac_pci.c +++ b/drivers/edac/edac_pci.c @@ -164,19 +164,6 @@ fail1: } /* - * complete_edac_pci_list_del - * - * RCU completion callback to indicate item is deleted - */ -static void complete_edac_pci_list_del(struct rcu_head *head) -{ - struct edac_pci_ctl_info *pci; - - pci = container_of(head, struct edac_pci_ctl_info, rcu); - INIT_LIST_HEAD(&pci->link); -} - -/* * del_edac_pci_from_global_list * * remove the PCI control struct from the global list @@ -184,8 +171,12 @@ static void complete_edac_pci_list_del(struct rcu_head *head) static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci) { list_del_rcu(&pci->link); - call_rcu(&pci->rcu, complete_edac_pci_list_del); - rcu_barrier(); + + /* these are for safe removal of devices from global list while + * NMI handlers may be traversing list + */ + synchronize_rcu(); + INIT_LIST_HEAD(&pci->link); } #if 0