linux-kernel - Re: [PATCH 2/7] tracing: Change strlen to sizeof for hist trigger static strings

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Message-ID: <20181219160138.447a4bb0@gandalf.local.home>
Date:   Wed, 19 Dec 2018 16:01:38 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <zanussi@...nel.org>
Cc:     Joe Perches <joe@...ches.com>, tglx@...utronix.de,
        mhiramat@...nel.org, namhyung@...nel.org, vedang.patel@...el.com,
        bigeasy@...utronix.de, joel@...lfernandes.org,
        mathieu.desnoyers@...icios.com, julia@...com,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 2/7] tracing: Change strlen to sizeof for hist trigger
 static strings

On Wed, 19 Dec 2018 14:38:39 -0600
Tom Zanussi <zanussi@...nel.org> wrote:

> On Wed, 2018-12-19 at 15:30 -0500, Steven Rostedt wrote:
> > On Wed, 19 Dec 2018 12:20:19 -0800
> > Joe Perches <joe@...ches.com> wrote:
> >   
> > > > Yeah, I had considered it but wasn't sure it was worth it.  Since
> > > > you're suggesting it is, I can send another patch on top of
> > > > these, or
> > > > feel free if you want to too.  ;-)    
> > > 
> > > I believe the 'strlen("foo") -> sizeof("foo") - 1'
> > > conversions do not change objects at all.
> > > 
> > > strlen("constant") is already optimized by gcc to a
> > > constant value when fed a constant string.  
> > 
> > If that's the case (and it probably is), then yeah, strlen is
> > probably
> > better. As it can handle the "not a constant" that you stated in
> > another email.
> >   
> 
> OK, so I guess that means we should just drop this patch ('[PATCH 2/7]
> tracing: Change strlen to sizeof for hist trigger static strings').
> 

No, that patch is fine, the macro was not. I've already applied your
patch set. Just need to run it through my tests.

-- Steve