From: Dmitri Vorobiev <dmitri.vorobiev@movial.com>
To: unlisted-recipients:; (no To-header on input)
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: strange code in include/linux/kernel_stat.h
Date: Thu, 02 Apr 2009 14:05:51 +0300 [thread overview]
Message-ID: <49D49C0F.3000707@movial.com> (raw)
In-Reply-To: <49CCA5DF.6040804@movial.com>
Dmitri Vorobiev wrote:
> Hi,
>
> Depending on whether the CONFIG_GENERIC_HARDIRQS option is enabled or not, the header file include/linux/kernel_stat.h defines the following two entities:
>
> - the macro kstat_irqs_this_cpu for the case when CONFIG_GENERIC_HARDIRQS is set:
>
> #define kstat_irqs_this_cpu(DESC) \
> ((DESC)->kstat_irqs[smp_processor_id()])
>
> - another macro with the same name as the macro above but for the case CONFIG_GENERIC_HARDIRQS is not set:
>
> #define kstat_irqs_this_cpu(irq) \
> (kstat_this_cpu.irqs[irq])
>
> Apparently, it is assumed that the types for the macro argument are different, and depend on the value of CONFIG_GENERIC_HARDIRQS. Is this intentional?
>
I still would like to know what's going on there. Anyone knowledgeable out there, please?
Dmitri
> Thanks,
> Dmitri
>
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prev parent reply other threads:[~2009-04-02 11:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-27 10:09 strange code in include/linux/kernel_stat.h Dmitri Vorobiev
2009-04-02 11:05 ` Dmitri Vorobiev [this message]
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