linux-kernel - Re: [RFC][PATCH] genirq: add IRQF

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Date:	Sun, 8 Sep 2013 21:02:44 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Cc:	paul.mckenney@...aro.org, akpm@...ux-foundation.org,
	decot@...glers.com, amirv@...lanox.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] genirq: add IRQF_NONE

On Mon, Sep 09, 2013 at 05:48:39AM +0200, Michael Opdenacker wrote:
> What about adding an IRQF_NONE flag as in the below patch?
> 
> I'm currently working on removing the use of the deprecated
> IRQF_DISABLED flag, and frequently have to replace
> IRQF_DISABLED by 0, typically in request_irq() arguments.
> 
> Using IRQF_NONE instead of 0 would make the code more readable,
> at least for people reading driver code for the first time.
> 
> Would it worth it?
> 
> I'm sure this kind of idea has come up many times before...
> 
> Signed-off-by: Michael Opdenacker <michael.opdenacker@...e-electrons.com>

I don't think it makes sense, no; it's a flags field, meant to receive a
set of flags, and 0 is the standard empty set of flags.  I think
IRQF_NONE would actually reduce readability, especially for readers who
haven't seen it before, because it isn't immediately obvious that it
just corresponds to the 0 of "no flags".  My first guess reading it
would be that it's some non-zero flag with some non-obvious semantic,
such as "don't actually allocate an IRQ", or something strange like
that.

- Josh Triplett
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