linux-kernel - Re: [PATCH 16/19] OpenRISC: Headers

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Message-Id: <201106192143.08208.arnd@arndb.de>
Date:	Sun, 19 Jun 2011 21:43:08 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jonas Bonn <jonas@...thpole.se>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/19] OpenRISC: Headers

On Sunday 19 June 2011 21:39:45 Arnd Bergmann wrote:
> > +
> > +extern inline void __delay(int loops)
> > +{
> > +     __asm__ __volatile__ (
> > +                           "l.srli %0,%0,1;"
> > +                           "1: l.sfeqi %0,0;"
> > +                           "l.bnf 1b;"
> > +                           "l.addi %0,%0,-1;"
> > +                           : "=r" (loops): "0" (loops));
> > +}
> > +
> 
> If you have an accurate high-resolution time source, better make this compare
> the current time in a loop than do a handcoded delay.

Hmm, I just saw that you actually have a better version of this, but
since this is marked "extern inline", code probably always gets this
version. Better never use extern inline, except when you have a good
reason and document it.

	Arnd
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