linux-kernel - Re: [PATCH 2/5] Add nsecs_to_cputime64 interface for asm-generic -v2

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Message-ID: <20101222093032.0320c9bf@mschwide.boeblingen.de.ibm.com>
Date:	Wed, 22 Dec 2010 09:30:32 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Venkatesh Pallipadi <venki@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Shaun Ruffell <sruffell@...ium.com>
Subject: Re: [PATCH 2/5] Add nsecs_to_cputime64 interface for asm-generic
 -v2

On Tue, 21 Dec 2010 17:09:01 -0800
Venkatesh Pallipadi <venki@...gle.com> wrote:

> Add nsecs_to_cputime64 interface. This is used in following patches that
> updates cpu irq stat based on ns granularity info in IRQ_TIME_ACCOUNTING.
> 
> Tested-by: Shaun Ruffell <sruffell@...ium.com>
> Signed-off-by: Venkatesh Pallipadi <venki@...gle.com>
> ---
>  include/asm-generic/cputime.h |    3 +++
>  include/linux/jiffies.h       |    1 +
>  kernel/time.c                 |   23 +++++++++++++++++++++--
>  3 files changed, 25 insertions(+), 2 deletions(-)
> 
> diff --git a/include/asm-generic/cputime.h b/include/asm-generic/cputime.h
> index 2bcc5c7..61e03dd 100644
> --- a/include/asm-generic/cputime.h
> +++ b/include/asm-generic/cputime.h
> @@ -30,6 +30,9 @@ typedef u64 cputime64_t;
>  #define cputime64_to_jiffies64(__ct)	(__ct)
>  #define jiffies64_to_cputime64(__jif)	(__jif)
>  #define cputime_to_cputime64(__ct)	((u64) __ct)
> +#define cputime64_gt(__a, __b)		((__a) >  (__b))
> +
> +#define nsecs_to_cputime64(__ct)	nsecs_to_jiffies64(__ct)
> 
> 
>  /*

If you define a new cputime primitive it is not enough to add it to the
generic cputime header. You have to add it to the arch-specific cputime
header for ia64, powerpc and s390 as well. Otherwise the build will
break with CONFIG_VIRT_CPU_ACCOUNTING=y on these architectures once the
new primitive is used.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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