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Date: Fri, 10 Jun 2005 08:10:58 -0700
From: Tony Lindgren <tony@atomide.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: linux-kernel@vger.kernel.org,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       Jonathan Corbet <corbet@lwn.net>,
       Bernard Blackham <b-lkml@blackham.com.au>,
       Christian Hesse <mail@earthworm.de>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>
Subject: Re: [PATCH] Dynamic tick for x86 version 050609-2
Message-ID: <20050610151058.GA7858@atomide.com>
References: <88056F38E9E48644A0F562A38C64FB6004EBD10C@scsmsx403.amr.corp.intel.com> <20050609014033.GA30827@atomide.com> <20050610043018.GE18103@atomide.com> <20050610091008.GG4173@elf.ucw.cz>
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* Pavel Machek <pavel@ucw.cz> [050610 02:10]:
> Hi!
> 
> Some more nitpicking...

Great!

> > +/*
> > + * ---------------------------------------------------------------------------
> > + * Command line options
> > + * ---------------------------------------------------------------------------
> > + */
> > +static int __initdata dyntick_autoenable = 0;
> > +static int __initdata dyntick_useapic = 0;
> > +
> > +/*
> > + * dyntick=[enable|disable],[forceapic]
> > + */ 
> > +static int __init dyntick_setup(char *options)
> > +{
> > +	if (!options)
> > +		return 0;
> > +
> > +	if (strstr(options, "enable"))
> > +		dyntick_autoenable = 1;
> > +
> > +	if (strstr(options, "forceapic"))
> > +		dyntick_useapic = 1;
> > +
> > +	return 0;
> > +}
> > +
> > +__setup("dyntick=", dyntick_setup);
> 
> 
> Well, your parsing is little too simplistic. If I pass
> dyntick=do_not_dare_to_enable_it, it still enables :-).

OK, I'll change that to test that enable is the first option.

> > +/*
> > + * ---------------------------------------------------------------------------
> > + * Sysfs interface
> > + * ---------------------------------------------------------------------------
> > + */
> > +
> > +extern struct sys_device device_timer;
> > +
> > +static ssize_t show_dyn_tick_state(struct sys_device *dev, char *buf)
> > +{
> > +	return sprintf(buf, "suitable:\t%i\n"
> > +		       "enabled:\t%i\n"
> > +		       "using APIC:\t%i\n",
> > +		       dyn_tick->state & DYN_TICK_SUITABLE,
> > +		       (dyn_tick->state & DYN_TICK_ENABLED) >> 1,
> > +		       (dyn_tick->state & DYN_TICK_USE_APIC) >> 3);
> 
> You basically hardcode values of DYN_TICK_* here. Why not use !!() and
> loose dependency?
> 
> 								Pavel

OK, thanks.

Tony