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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 2 Sep 2016 13:26:08 -0700
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To: Arnd Bergmann <arnd@arndb.de>, Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Cc: ksummit-discuss@lists.linuxfoundation.org, "Nikula,
	Jani" <jani.nikula@linux.intel.com>, Dave Airlie <airlied@linux.ie>,
	Grant Likely <grant.likely@linaro.org>,
	ppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] (group) maintainership models
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On Fri, Sep 2, 2016 at 1:06 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>
> When I once looked, I thought all drivers using NO_IRQ were specific
> to powerpc or one of the less common architectures.

powerpc definitely does seem to be the biggest case, with about half
the instances of NO_IRQ being under arch/powerpc/ (and a few more in
ppc-specific drivers).

Adding the powerpc maintainers to the list - because it would really
be nice to get rid of it, or at least make it *so* rare that we don't
have people re-introducing it again because they thought it was the
right thing to do.

A fair amount of of it could even be done by some trivial scripting.
Something like

  git grep -wl NO_IRQ arch/powerpc/ | while read a
  do
      sed 's/(\([a-z_]*irq\) != NO_IRQ)/(\1)/' < $a > $a.new
      sed 's/(\([a-z_]*irq\) == NO_IRQ)/(!\1)/' < $a.new > $a
  done

does fix at least a few of the cases. It still leaves several
assignments and "return NO_IRQ;" statements, but a few more
sed-scripts would take care of most of it. Then remove the #define,
and do a full build to find any straggling cases.

Michael? Ben?

             Linus