linux-kernel - Re: [PATCH 00/15] Kill off set_irq

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Message-ID: <20150609202834.GH7557@n2100.arm.linux.org.uk>
Date:	Tue, 9 Jun 2015 21:28:34 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rob Herring <robh@...nel.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arm@...nel.org, Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Barry Song <baohua@...nel.org>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Roger Quadros <rogerq@...com>,
	Tony Lindgren <tony@...mide.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	David Airlie <airlied@...ux.ie>,
	Alexandre Courbot <gnurou@...il.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 00/15] Kill off set_irq_flags

On Tue, Jun 09, 2015 at 01:26:26PM -0500, Rob Herring wrote:
> This series converts all users of ARM specific set_irq_flags to use
> common genirq functions. In many cases where irqdomains are used, the
> set_irq_flags calls were redundant, so I've removed them.
> 
> This is not intended for 4.2, but if any subsystem maintainers want to
> pick up their subsystem's change that is fine. All but the last 2
> patches stand on their own. Any new drivers going into 4.2 may need a
> similar change, but I'm sure people are told not to use set_irq_flags in
> reviews. ;)

So what are you doing about the initial state of IRQs on legacy ARM where
IRQs start off being un-requestable, and need the set_irq_flags() to make
them requestable.  I think you could be introducing a massive regression
by making this change.

Unless you can prove that this isn't the case, you shouldn't be removing
this stuff, especially not from legacy platforms.

-- 
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