linux-kernel - Re: [RFC PATCH] x86: Add safe_udelay() and safe

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Message-ID: <20110113230248.GA15441@kroah.com>
Date:	Thu, 13 Jan 2011 15:02:48 -0800
From:	Greg KH <greg@...ah.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [RFC PATCH] x86: Add safe_udelay() and safe_msleep()

On Thu, Jan 13, 2011 at 11:52:17PM +0100, Thomas Gleixner wrote:
> On Thu, 13 Jan 2011, Greg KH wrote:
> > On Thu, Jan 13, 2011 at 02:21:29PM -0800, Yinghai Lu wrote:
> > > +extern void use_normal_delay(void);
> > > +extern void use_normal_sleep(void);
> > >  #endif /* defined(_LINUX_DELAY_H) */
> > > Index: linux-2.6/init/main.c
> > > ===================================================================
> > > --- linux-2.6.orig/init/main.c
> > > +++ linux-2.6/init/main.c
> > > @@ -879,6 +879,9 @@ static int __init kernel_init(void * unu
> > >  	cad_pid = task_pid(current);
> > >  
> > >  	smp_prepare_cpus(setup_max_cpus);
> > > +	/* set them back, x86 use it for early delay*/
> > > +	use_normal_delay();
> > > +	use_normal_sleep();
> > 
> > Ick, I really don't like this.
> > 
> > And, most importantly, I'm still not sure it's needed at all, as I don't
> > agree with your previous patches that you say this one is needed for.
> > 
> > So, how about we work on the original root problem here before worrying
> > about changing the main usleep logic for the whole kernel?
> 
> What the hell is the root problem ?

I have yet to figure that out, even after reading the patches provided
:(

confused,

greg k-h
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