linux-kernel - Re: [PATCH 1/4] powerpc: Add Kconfig dependency for PCI

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Date:	Tue, 17 Nov 2009 23:40:10 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] powerpc: Add Kconfig dependency for PCI_MSI as
 needed by XICS

On Tue, 2009-11-17 at 12:07 +0000, Mel Gorman wrote:
> It's possible to set CONFIG_XICS without CONFIG_PCI_MSI. When that
> happens, the kernel fails to build with
> 
> arch/powerpc/platforms/built-in.o: In function `.xics_startup':
> xics.c:(.text+0x12f60): undefined reference to `.unmask_msi_irq'
> make: *** [.tmp_vmlinux1] Error 1
> 
> This patch adds the dependency in KConfig.

Actually we should ifdef the code instead, XICS doesn't require MSI -
that code chunk just needs to be conditional.

cheers

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