linux-kernel - Re: [PATCH 1/1] MM: slqb, fix per

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Message-Id: <200911041815.53431.rusty@rustcorp.com.au>
Date:	Wed, 4 Nov 2009 18:15:52 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	npiggin@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 1/1] MM: slqb, fix per_cpu access

On Tue, 3 Nov 2009 02:01:41 am Jiri Slaby wrote:
> >> -	struct delayed_work *cache_trim_work = &per_cpu(cache_trim_work, cpu);
> >> +	struct delayed_work *_cache_trim_work = &per_cpu(cache_trim_work, cpu);
> >>  
> >>  	/*
> >>  	 * When this gets called from do_initcalls via cpucache_init(),
> >>  	 * init_workqueues() has already run, so keventd will be setup
> >>  	 * at that time.
> >>  	 */
> >> -	if (keventd_up() && cache_trim_work->work.func == NULL) {
> >> -		INIT_DELAYED_WORK(cache_trim_work, cache_trim_worker);
> >> -		schedule_delayed_work_on(cpu, cache_trim_work,
> >> +	if (keventd_up() && _cache_trim_work->work.func == NULL) {
> >> +		INIT_DELAYED_WORK(_cache_trim_work, cache_trim_worker);
> >> +		schedule_delayed_work_on(cpu, _cache_trim_work,
> >>  					__round_jiffies_relative(HZ, cpu));
> > 
> > How about calling the local var "trim"?
> > 
> > This actually makes the code more readable, IMHO.
> 
> Please ignore this version of the patch. After this I sent a new one
> which changes the global var name.

OK, sure.  It's not worth changing unless you were doing a rename anyway.

> So the local variable is untouched there. If you want me to perform the
> cleanup, let me know. In any case I'd make it trim_work instead of trim
> which makes more sense to me.

This is getting pedantic and marginal, but the word "work" already appears
everywhere this var is used.  Either "XXX->work", or "INIT_DELAYED_WORK(XXX"
or "scheduled_delayed_work_on(cpu, XXX".

That's why I think the word "work" in unnecessary.

Hope that clarifies why I preferred "trim".
Rusty.
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