linux-kernel - Re: kernel/irq/irqdesc.c:206:2: error: array index in initializer exceeds array bounds

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Date:	Sun, 28 Feb 2016 11:33:32 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
cc:	kbuild test robot <fengguang.wu@...el.com>,
	"kbuild-all@...org" <kbuild-all@...org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: kernel/irq/irqdesc.c:206:2: error: array index in initializer
 exceeds array bounds

On Sun, 28 Feb 2016, Geert Uytterhoeven wrote:
> On Sun, Feb 28, 2016 at 10:32 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > On Sun, 28 Feb 2016, kbuild test robot wrote:
> >> FYI, the error/warning still remains.
> >>
> >> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> >> head:   691429e13dfaf5b0994b07cc166db41bd608ee3d
> >> commit: 3795de236d67a05994a1a12759db9d4dd9ffc42c genirq: Distangle kernel/irq/handle.c
> >> date:   5 years ago
> >> config: m68k-alldefconfig (attached as .config)
> >> reproduce:
> >>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
> >>         chmod +x ~/bin/make.cross
> >>         git checkout 3795de236d67a05994a1a12759db9d4dd9ffc42c
> >>         # save the attached .config to linux build tree
> >>         make.cross ARCH=m68k
> >
> > Again. This commit is just moving code into seperate files without changing
> > the code. So it's not a new wreckage.
> >
> >> All errors (new ones prefixed by >>):
> >>
> >>    In file included from include/linux/irqnr.h:10:0,
> >>                     from include/linux/irq.h:22,
> >>                     from kernel/irq/irqdesc.c:10:
> >>    arch/m68k/include/asm/irq.h:25:17: error: expected identifier or '(' before numeric constant
> >>     #define NR_IRQS 0
> >>                     ^
> >
> > NR_IRQS = 0 and CONFIG_SPARSE_IRQ=n is bogus. That alldefconfig of m68k is
> > broken. Cc'ed m68 folks
> 
> No idea where this "alldefconfig" is coming from (it contains "2.6.36-rc5").
> Is this an MMU=y allnoconfig?

# make alldefconfig

That's one of the targets for 68k. And yes, it has MMU=y

> It doesn't enable any platforms, which is not supported, and thus it isn't
> known how many interrupts are needed.
> 
> BTW, I have a local fix to change NR_IRQS to 1 in that case, but that's
> far from sufficient to build an MMU=y allnoconfig kernel.

Yeah. NR_IRQS=1 is lame.

Thanks,

	tglx