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

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Date:	Wed, 22 Dec 2010 06:23:55 -0800
From:	Venkatesh Pallipadi <venki@...gle.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.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 Wed, Dec 22, 2010 at 12:30 AM, Martin Schwidefsky
<schwidefsky@...ibm.com> wrote:
> 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.
>

But, those archs have arch specific cputime as well and so need a
different macro for nsecs_to_cputime64, instead of nsec_to_jiffies64.
Right? As of now this new primitive should not be used in those archs.
I guess this is something needed when using the primitive in future?

Thanks,
Venki
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