Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758491AbYAOXwg (ORCPT ); Tue, 15 Jan 2008 18:52:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757470AbYAOXsd (ORCPT ); Tue, 15 Jan 2008 18:48:33 -0500 Received: from mx1.redhat.com ([66.187.233.31]:52360 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757510AbYAOXsQ (ORCPT ); Tue, 15 Jan 2008 18:48:16 -0500 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 14/26] FS-Cache: Provide an add_wait_queue_tail() function To: sds@tycho.nsa.gov, casey@schaufler-ca.com, Trond.Myklebust@netapp.com, npiggin@suse.de Cc: linux-kernel@vger.kernel.org, selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org, dhowells@redhat.com Date: Tue, 15 Jan 2008 23:48:07 +0000 Message-ID: <20080115234807.22183.50431.stgit@warthog.procyon.org.uk> In-Reply-To: <20080115234652.22183.24850.stgit@warthog.procyon.org.uk> References: <20080115234652.22183.24850.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.14.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2061 Lines: 59 Provide an add_wait_queue_tail() function to add a waiter to the back of a wait queue instead of the front. Signed-off-by: David Howells --- include/linux/wait.h | 2 ++ kernel/wait.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+), 0 deletions(-) diff --git a/include/linux/wait.h b/include/linux/wait.h index 0e68628..f1038d0 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -118,6 +118,8 @@ static inline int waitqueue_active(wait_queue_head_t *q) #define is_sync_wait(wait) (!(wait) || ((wait)->private)) extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); +extern void FASTCALL(add_wait_queue_tail(wait_queue_head_t *q, + wait_queue_t *wait)); extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait)); extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); diff --git a/kernel/wait.c b/kernel/wait.c index 444ddbf..7acc9cc 100644 --- a/kernel/wait.c +++ b/kernel/wait.c @@ -29,6 +29,24 @@ void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait) } EXPORT_SYMBOL(add_wait_queue); +/** + * add_wait_queue_tail - Add a waiter to the back of a waitqueue + * @q: the wait queue to append the waiter to + * @wait: the waiter to be queued + * + * Add a waiter to the back of a waitqueue so that it gets woken up last. + */ +void fastcall add_wait_queue_tail(wait_queue_head_t *q, wait_queue_t *wait) +{ + unsigned long flags; + + wait->flags &= ~WQ_FLAG_EXCLUSIVE; + spin_lock_irqsave(&q->lock, flags); + __add_wait_queue_tail(q, wait); + spin_unlock_irqrestore(&q->lock, flags); +} +EXPORT_SYMBOL(add_wait_queue_tail); + void fastcall add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait) { unsigned long flags; -- 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/