linux-kernel - Re: [PATCH] Fix irqpoll on IA64 (timer interrupt != 0)

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Message-ID: <20070322224534.GA12791@sykes.suse.de>
Date:	Thu, 22 Mar 2007 23:45:34 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] Fix irqpoll on IA64 (timer interrupt != 0)

Hello,

* Thomas Gleixner <tglx@...utronix.de> [2007-03-22 22:23]:
> 
> > Also, the code presently passes the magic IRQ number into the generic IRQ
> > code.  I wonder if we'd get a more pleasing result if we were to make the
> > generic IRQ code call _out_ to the architecture:
> 
> > Then, ia64 can implement arch_is_irqpoll_irq() and it can do whatever it
> > wants in there.
> > 
> > The __attribute__((weak)) thing adds a little bit of overhead, but I don't
> > think this is a fastpath?
> 
> Well, depends what you consider a fastpath. When noirqdebug == 0, it is
> called on every interrupt.

I think that function is only called if irqfixup == 2, because if the
first condition in the expression is wrong, the evaluation of the
expression is aborted in C.


Regards,
  Bernhard
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