linux-kernel - Re: [PATCH] powerpc/powernv: Select CONFIG

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Date:	Mon, 29 Dec 2014 20:01:47 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
	Michael Neuling <mikey@...ling.org>,
	"open list:LINUX FOR POWERPC..." <linuxppc-dev@...ts.ozlabs.org>,
	open list <linux-kernel@...r.kernel.org>,
	hegdevasant@...ux.vnet.ibm.com
Subject: Re: [PATCH] powerpc/powernv: Select CONFIG_PRINTK to fix build
 failure

On Sat, 2014-12-27 at 12:17 -0500, Pranith Kumar wrote:
> In an allnoconfig we get the following build failure:
 
An allnoconfig doesn't include CONFIG_PPC_POWERNV? But I think I know what you
mean.

> arch/powerpc/platforms/built-in.o: In function `.__machine_initcall_powernv_opal_init':
> opal.c:(.init.text+0x468): undefined reference to `.log_buf_addr_get'
> opal.c:(.init.text+0x474): undefined reference to `.log_buf_len_get'
> make: *** [vmlinux] Error 1
> 
> This happens because powernv requires printk() support. Enable it in the config
> file.

Sort of. It just requires those two routines. Or is there a stronger
dependency?

I think the better fix is for those two routines to be defined for
CONFIG_PRINTK=n, but return NULL and zero respectively.

And the opal code could skip registering the region when they return NULL/zero.

Care to do a couple of patches?

cheers


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