linux-kernel - Re: [PATCH v8 02/12] kthread: Kthread worker API cleanup

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Message-ID: <20160609110710.510c7c67@gandalf.local.home>
Date:	Thu, 9 Jun 2016 11:07:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	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>,
	"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>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 02/12] kthread: Kthread worker API cleanup

On Thu,  9 Jun 2016 15:51:56 +0200
Petr Mladek <pmladek@...e.com> wrote:

> A good practice is to prefix the names of functions and macros
> by the name of the subsystem.
> 
> The kthread worker API is a mix of classic kthreads and workqueues.
> Each worker has a dedicated kthread. It runs a generic function
> that process queued works. It is implemented as part of
> the kthread subsystem.
> 
> This patch renames the existing kthread worker API to use
> the corresponding name from the workqueues API prefixed by
> kthread_/KTHREAD_:
> 
> DEFINE_KTHREAD_WORKER()		-> KTHREAD_DECLARE_WORKER()
> DEFINE_KTHREAD_WORK()		-> KTHREAD_DECLARE_WORK()
> DEFINE_KTHREAD_WORKER_ONSTACK()	-> KTHREAD_DECLARE_WORKER_ONSTACK()
> DEFINE_KTHREAD_WORKER_ONSTACK()	-> KTHREAD_DECLARE_WORKER_ONSTACK()
> __init_kthread_worker()		-> __kthread_init_worker()
> init_kthread_worker()		-> kthread_init_worker()
> init_kthread_work()		-> kthread_init_work()
> insert_kthread_work()		-> kthread_insert_work()
> queue_kthread_work()		-> kthread_queue_work()
> flush_kthread_work()		-> kthread_flush_work()
> flush_kthread_worker()		-> kthread_flush_worker()
> 

I know that Andrew suggested this, but I didn't get a chance to respond
to his email due to traveling.

Does this mean we are going to change all APIs like this? Because we
pretty much use this type of naming everywhere. That is, we start with
"DEFINE_*" and "DECLARE_*" commonly. As well as "init_*".

For example DEFINE_PER_CPU(), DEFINE_SPINLOCK(), DEFINE_LGLOCK(),
DEFINE_MUTEX(), DEFINE_RES_MEME(), DEFINE_TIMER(), DEFINE_IDA(),
DEFINE_NFS4_*(), and the list goes on. Just do a grep in
include/linux/*.h for DEFINE_ and DECLARE_.

Also, are you sure that we should change the DEFINE to a DECLARE,
because DEFINE is used to create the object in question, DECLARE is for
header files:

X.h:

DECLARE_PER_CPU(int, x);


X.c


DEFINE_PER_CPU(int, x);


-- Steve