linux-kernel - [RFC PATCH 06/14] kthread: Add kthread_worker

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Date:	Tue, 28 Jul 2015 16:39:23 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>,
	live-patching@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [RFC PATCH 06/14] kthread: Add kthread_worker_created()

I would like to make cleaner kthread worker API and hide the definition
of struct kthread_worker. It will prevent any custom hacks and make
the API more secure.

This patch provides an API to check if the worker has been created
and hides the implementation details.

Signed-off-by: Petr Mladek <pmladek@...e.com>
---
 include/linux/kthread.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 24d72bac27db..02d3cc9ad923 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -122,6 +122,11 @@ extern void __init_kthread_worker(struct kthread_worker *worker,
 		(work)->func = (fn);					\
 	} while (0)
 
+static inline bool kthread_worker_created(struct kthread_worker *worker)
+{
+	return (worker && worker->task);
+}
+
 int kthread_worker_fn(void *worker_ptr);
 
 __printf(3, 4)
-- 
1.8.5.6

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