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From: Dmitri Vorobiev <dmitri.vorobiev@movial.com>
To: LKML <linux-kernel@vger.kernel.org>
Subject: strange code in include/linux/kernel_stat.h
Date: Fri, 27 Mar 2009 12:09:35 +0200	[thread overview]
Message-ID: <49CCA5DF.6040804@movial.com> (raw)

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?

Thanks,
Dmitri


             reply	other threads:[~2009-03-27 10:31 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-27 10:09 Dmitri Vorobiev [this message]
2009-04-02 11:05 ` strange code in include/linux/kernel_stat.h Dmitri Vorobiev

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