linux-kernel - Re: [patch V2 01/29] tracing: Cleanup stack trace code

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Message-ID: <20190418203954.631914cb@oasis.local.home>
Date:   Thu, 18 Apr 2019 20:39:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
        David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev@...glegroups.com,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs@...r.kernel.org, dm-devel@...hat.com,
        Mike Snitzer <snitzer@...hat.com>,
        Alasdair Kergon <agk@...hat.com>,
        intel-gfx@...ts.freedesktop.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        linux-arch@...r.kernel.org
Subject: Re: [patch V2 01/29] tracing: Cleanup stack trace code

On Fri, 19 Apr 2019 00:44:17 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Thu, 18 Apr 2019, Steven Rostedt wrote:
> > On Thu, 18 Apr 2019 10:41:20 +0200
> > Thomas Gleixner <tglx@...utronix.de> wrote:
> >   
> > > @@ -412,23 +404,20 @@ stack_trace_sysctl(struct ctl_table *tab
> > >  		   void __user *buffer, size_t *lenp,
> > >  		   loff_t *ppos)
> > >  {
> > > -	int ret;
> > > +	int ret, was_enabled;  
> > 
> > One small nit. Could this be:
> > 
> > 	int was_enabled;
> > 	int ret;
> > 
> > I prefer only joining variables that are related on the same line.
> > Makes it look cleaner IMO.  
> 
> If you wish so. To me it's waste of screen space :)

At least you didn't say it helps the compiler ;-)

> 
> > >  
> > >  	mutex_lock(&stack_sysctl_mutex);
> > > +	was_enabled = !!stack_tracer_enabled;
> > >    
> > 
> > Bah, not sure why I didn't do it this way to begin with. I think I
> > copied something else that couldn't do it this way for some reason and
> > didn't put any brain power behind the copy. :-/ But that was back in
> > 2008 so I blame it on being "young and stupid" ;-)  
> 
> The young part is gone for sure :)

I purposely set you up for that response.

> 
> > Other then the above nit and removing the unneeded +1 in max_entries:  
> 
> s/+1/-1/

That was an ode to G+

-- Steve