linux-kernel - Re: IRQ subsystem menu

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Date:	Mon, 29 Oct 2012 15:03:08 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Paul Thompson <set.mailinglist@...il.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: IRQ subsystem menu

(Adding lkml and Thomas as IRQ subsystem maintainer to CC)

On Sun, Oct 21, 2012 at 03:40:16AM -0400, Paul Thompson wrote:
> 	Hi;
> 
> 	In menuconfig, General setup -> IRQ subsystem, there are two
> possible menu-items. One depends partly on IRQ_DOMAIN, and the other
> on MAY_HAVE_SPARSE_IRQ.
> 
> 	On the x86-64 arch, neither of these seems to be set, so the
> menu entry is blank if entered (displaying an odd ^@ if you try to
> navigate up or down. And sometimes some screen garbage on the sides.)
> 
> 	Previously (in the 3.2 kernel at least) this menu used to be
> populated by the "Support sparse IRQ numbering" menu-item, which
> at that time depended on HAVE_SPARSE_IRQ, and was forced to YES.
> 
> 	I do not know if the current behaviour is intended, but it
> is ugly and confusing to be confronted with a blank menu page.
> 
> 	Ideally, the "IRQ subsystem" menu would not even show up
> if it would contain no menu-items, but I do not know enough to
> formulate that constraint.
> 
> 	A simple alternative is a comment section to reasure babes in
> the wood of kernel configuration that something is not amiss. I include
> a sample patch.
> 
> Paul
> set.mailinglist@...il.com

> --- linux-3.7-rc2/kernel/irq/Kconfig.orig	2012-10-20 15:11:32.000000000 -0400
> +++ linux-3.7-rc2/kernel/irq/Kconfig	2012-10-21 03:14:56.272952813 -0400
> @@ -4,6 +4,9 @@ config HAVE_GENERIC_HARDIRQS
>  
>  if HAVE_GENERIC_HARDIRQS
>  menu "IRQ subsystem"
> +
> +comment "Some configurations may have no available options here"
> +
>  #
>  # Interrupt subsystem related configuration options
>  #

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