Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755906AbZJAIKe (ORCPT ); Thu, 1 Oct 2009 04:10:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755739AbZJAIKb (ORCPT ); Thu, 1 Oct 2009 04:10:31 -0400 Received: from hera.kernel.org ([140.211.167.34]:38367 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755848AbZJAIKS (ORCPT ); Thu, 1 Oct 2009 04:10:18 -0400 From: Tejun Heo To: jeff@garzik.org, mingo@elte.hu, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, jens.axboe@oracle.com, rusty@rustcorp.com.au, cl@linux-foundation.org, dhowells@redhat.com, arjan@linux.intel.com Cc: Tejun Heo Subject: [PATCH 05/19] kthread: implement kthread_data() Date: Thu, 1 Oct 2009 17:09:04 +0900 Message-Id: <1254384558-1018-6-git-send-email-tj@kernel.org> X-Mailer: git-send-email 1.6.4.2 In-Reply-To: <1254384558-1018-1-git-send-email-tj@kernel.org> References: <1254384558-1018-1-git-send-email-tj@kernel.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Thu, 01 Oct 2009 08:09:37 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2116 Lines: 71 Implement kthread_data() which takes @task pointing to a kthread and returns @data specified when creating the kthread. The caller is responsible for ensuring the validity of @task when calling this function. Signed-off-by: Tejun Heo --- include/linux/kthread.h | 1 + kernel/kthread.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+), 0 deletions(-) diff --git a/include/linux/kthread.h b/include/linux/kthread.h index aabc8a1..14f63e8 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -30,6 +30,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data), void kthread_bind(struct task_struct *k, unsigned int cpu); int kthread_stop(struct task_struct *k); int kthread_should_stop(void); +void *kthread_data(struct task_struct *k); int kthreadd(void *unused); extern struct task_struct *kthreadd_task; diff --git a/kernel/kthread.c b/kernel/kthread.c index 5fe7099..bd4cb7f 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -35,6 +35,7 @@ struct kthread_create_info struct kthread { int should_stop; + void *data; struct completion exited; }; @@ -54,6 +55,19 @@ int kthread_should_stop(void) } EXPORT_SYMBOL(kthread_should_stop); +/** + * kthread_data - return data value specified on kthread creation + * @task: kthread task in question + * + * Return the data value specified when kthread @task was created. + * The caller is responsible for ensuring the validity of @task when + * calling this function. + */ +void *kthread_data(struct task_struct *task) +{ + return to_kthread(task)->data; +} + static int kthread(void *_create) { /* Copy data: it's on kthread's stack */ @@ -64,6 +78,7 @@ static int kthread(void *_create) int ret; self.should_stop = 0; + self.data = data; init_completion(&self.exited); current->vfork_done = &self.exited; -- 1.6.4.2 -- 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/