From: Joe Perches <joe@perches.com>
To: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Mischa Jonker <Mischa.Jonker@synopsys.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Joern Rennecke <joern.rennecke@embecosm.com>
Subject: Re: [PATCH] ARC: Fix __udelay parentheses
Date: Wed, 28 Aug 2013 23:37:04 -0700 [thread overview]
Message-ID: <1377758224.1928.91.camel@joe-AO722> (raw)
In-Reply-To: <C2D7FE5348E1B147BCA15975FBA23075140F41@IN01WEMBXA.internal.synopsys.com>
On Thu, 2013-08-29 at 06:24 +0000, Vineet Gupta wrote:
> On 08/29/2013 11:31 AM, Joe Perches wrote:
> > I think the whole thing is odd and it should simply be
> >
> > loops = loops_per_jiffy * usecs_to_jiffies(usecs)
[]
> On the topic of multiply vs. divide (which probably is not relevant to topic at
> hand though), since ARCompact doesn't have native divide, we end up emulating it
> using libgcc routines. That makes it slightly non-deterministic (not a big deal)
> and also adds to boot time (which those delays sprinkled all over the place in
> crazy device probes and such). Seriously we got hammered by a customer for that once.
That argues more for reducing the uses of hard delays
than making the hard delay count calculation simpler.
next prev parent reply other threads:[~2013-08-29 6:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-28 18:29 Mischa Jonker
2013-08-28 18:45 ` Joe Perches
2013-08-28 18:53 ` Mischa Jonker
2013-08-28 19:01 ` Joe Perches
2013-08-28 19:12 ` Mischa Jonker
2013-08-29 1:43 ` Joe Perches
2013-08-29 5:55 ` Vineet Gupta
2013-08-29 6:01 ` Joe Perches
2013-08-29 6:24 ` Vineet Gupta
2013-08-29 6:37 ` Joe Perches [this message]
2013-08-29 6:49 ` Vineet Gupta
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