linux-kernel - Re: [PATCH 2/2] time: allow gcc to fold constants when possible

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Message-ID: <20150604072725.GC30121@opentech.at>
Date:	Thu, 4 Jun 2015 09:27:25 +0200
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Joe Perches <joe@...ches.com>,
	Nicholas Mc Guire <hofrat@...dl.org>,
	Michal Marek <mmarek@...e.cz>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	Sam Ravnborg <sam@...nborg.org>,
	"H. Peter Alvin" <hpa@...or.com>,
	John Stultz <john.stultz@...aro.org>,
	Andrew Hunter <ahh@...gle.com>, Paul Turner <pjt@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] time: allow gcc to fold constants when possible

On Tue, 02 Jun 2015, Thomas Gleixner wrote:

> On Thu, 28 May 2015, Joe Perches wrote:
> > On Thu, 2015-05-28 at 19:09 +0200, Nicholas Mc Guire wrote:
> > > To allow constant folding in usecs_to_jiffies() conditionally calls
> > > the HZ dependent _usecs_to_jiffies() helpers or, when gcc can not
> > > figure out constant folding, __usecs_to_jiffies, which is the renamed
> > > original usecs_to_jiffies() function.
> > 
> > Hi Nicholas.
> > 
> > Thanks for following through with this.
> > 
> > The subject might be nicer if it referenced usecs_to_jiffies
> > instead of being a bit generic.
> > 
> > Maybe something like:
> > 
> > time: allow gcc to fold usecs_to_jiffies(constant)
> 
> And for correctness sake the first letter after the colon, i.e. the
> one starting the sentence wants to be uppercase.
> 
added to my list of checks - sorry for being sloppy on that

> I'm going to fix that up all together when applying the lot. No need
> for resend.
>

thanks !
hofrat
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