linux-kernel - Re: [PATCH] Add support for deferrable timers (respun)

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Message-ID: <20070328164200.GA27711@linux-os.sc.intel.com>
Date:	Wed, 28 Mar 2007 09:42:00 -0700
From:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, davej@...emonkey.org.uk,
	johnstul@...ibm.com, mingo@...e.hu, tglx@...utronix.de
Subject: Re: [PATCH] Add support for deferrable timers (respun)

On Wed, Mar 28, 2007 at 01:06:35PM +0200, Andi Kleen wrote:
> Venki Pallipadi <venkatesh.pallipadi@...el.com> writes:
> > +++ new/kernel/timer.c	2007-03-26 15:19:35.000000000 -0800
> > @@ -74,7 +74,7 @@
> >  	tvec_t tv3;
> >  	tvec_t tv4;
> >  	tvec_t tv5;
> > -} ____cacheline_aligned_in_smp;
> > +} ____cacheline_aligned;
> 
> Why this change?  It should be aligned to 2 bytes anyways.

Just wanted to be cautious of all archs and all compilers.
 
> >  static DEFINE_PER_CPU(tvec_base_t *, tvec_bases) = &boot_tvec_bases;
> >  
> > +/*
> > + * The lowest bit of base ptr in timer is used as a flag to indicate
> > + * 'deferrable' nature of the timer. Functions below help us manage that flag.
> > + */
> > +static inline unsigned int tbase_get_deferrable(struct tvec_t_base_s *base)
> > +{
> > +	return ((unsigned int)base & TBASE_DEFERRABLE_FLAG);
> 
> This will warn on 64bit for cast ptr -> int

OK. Will change this to ptr->long->int in the update patch.

Thanks,
Venki
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