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

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Date:	28 Mar 2007 13:06:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	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)

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.

>  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


-Andi
-
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