linux-kernel - Re: [PATCH] sched: Remove nested extern

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Date:	Wed, 24 Sep 2014 09:52:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"Rustad, Mark D" <mark.d.rustad@...el.com>,
	"sparse@...isli.org" <sparse@...isli.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"richard.weinberger@...il.com" <richard.weinberger@...il.com>,
	"linux-sparse@...r.kernel.org" <linux-sparse@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>
Subject: Re: [PATCH] sched: Remove nested extern

On Wed, Sep 24, 2014 at 09:41:44AM +0200, Ingo Molnar wrote:
> 
> * Rustad, Mark D <mark.d.rustad@...el.com> wrote:
> 
> > On Sep 22, 2014, at 2:21 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > On Mon, Sep 22, 2014 at 08:59:32PM +0000, Rustad, Mark D wrote:
> > >> Because I have found that enabling many warnings helps identify problems
> > >> in code and it has been my standard practice since about 1999 to do so.
> > >> The compiler warnings are really just another form of static analysis,
> > >> and I use it routinely on every compile. Here is how routinely: I have
> > >> W=1 in my environment, W=12 is just too painful. I would change that
> > >> default to W=12 if it wasn't insane to do so.
> > > 
> > > Many warnings are just plain insane and stupid. They're not 
> > > helping anybody. There's a very good reason many are 
> > > disabled. I'm sure you can find some entertaining discussions 
> > > on the topic if you search the LKML archives.
> > 
> > That is what I used to think. -Wshadow for example. What's the 
> > problem? [...]
> 
> Then please add it to the default build. There are some warnings 
> that used to be crap but have been improved over the year - 
> enable them one by one, with good case by case justification and 
> analysis. Just going after all W=2 warnings is insane.

So I don't like the nested extern one because it either means not using
that language feature at all or pooping all over your code with that
DECL crap. That just a loose-loose proposition.
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