linux-kernel - Re: [PATCH 1/2] powerpc/8xx: Fix NR_IRQ bugs and refactor 8xx interrupt controller

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Message-Id: <20120419182234.352973E0700@localhost>
Date:	Thu, 19 Apr 2012 12:22:34 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] powerpc/8xx: Fix NR_IRQ bugs and refactor 8xx interrupt controller

On Tue, 17 Apr 2012 09:03:02 +1000, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> On Mon, 2012-04-16 at 14:13 -0600, Grant Likely wrote:
> > The mpc8xx driver uses a reference to NR_IRQS that is buggy.  It uses
> > NR_IRQs for the array size of the ppc_cached_irq_mask bitmap, but
> > NR_IRQs could be smaller than the number of hardware irqs that
> > ppc_cached_irq_mask tracks.
> > 
> > Also, while fixing that problem, it became apparent that the interrupt
> > controller only supports 32 interrupt numbers, but it is written as if
> > it supports multiple register banks which is more complicated.
> > 
> > This patch pulls out the buggy reference to NR_IRQs and fixes the size
> > of the ppc_cached_irq_mask to match the number of HW irqs.  It also
> > drops the now-unnecessary code since ppc_cached_irq_mask is no longer
> > an array.
> 
> Can you rename ppc_cached_irq_mask while at it ? I think it was written
> that way because it was all copy/pasted from powermac/pic.c which -does-
> need it to be an array (and has the same bugs btw) :-) 

Done; and I think I fixed the pic.c bugs in patch 2.

g.

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