linux-kernel - Re: [RFC trollpatch 1/1] genirq: Remove the fits all and nothing __do

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Message-ID: <AANLkTikVHO9DmyTX==CwViDK1rP0masBwjMakHZ0U=kZ@mail.gmail.com>
Date:	Mon, 27 Sep 2010 10:36:16 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-alpha@...r.kernel.org, linux-cris-kernel@...s.com,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	linux-ia64@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Greg Ungerer <gerg@...inux.org>, Jeff Dike <jdike@...toit.com>,
	linux-parisc@...r.kernel.org, Chris Zankel <chris@...kel.net>,
	linux-arch@...r.kernel.org
Subject: Re: [RFC trollpatch 1/1] genirq: Remove the fits all and nothing
 __do_IRQ() code

On Wed, Sep 8, 2010 at 11:14 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>  The following architectures are still using __do_IRQ():
>
>  alpha, cris, ia64, h8300, m32r, m68knommu, parisc, um

Thomas,

I (belatedly) took a look at fixing ia64 ... but I've run into a small snag.
The __do_IRQ() routine makes a call to:

 desc->chip->end(irq);

while neither of the "handle_level_irq()" nor "handle_edge_irq()"
functions do this.

On ia64 iosapic_end_level_irq() call iosapic_eoi() for me. Without it
my system hangs during boot (with some driver timeout complaining
about dropped interrupts).

Is the omission of desc->chip->end(irq); deliberate? In which case
I need to find another place to call iosapic_eoi(). Or is it accidental?

Thanks

-Tony
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