linux-kernel - Re: build issue #538 for v2.6.27-rc1 :undefined reference to `pnp_get

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Message-ID: <20080730112211.GA19966@cs181140183.pp.htv.fi>
Date:	Wed, 30 Jul 2008 14:22:11 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Toralf Förster <toralf.foerster@....de>,
	ambx1@....rr.com, linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: build issue #538 for v2.6.27-rc1 :undefined reference to
	`pnp_get_resource'

On Wed, Jul 30, 2008 at 03:03:44AM -0700, Andrew Morton wrote:
> On Tue, 29 Jul 2008 18:11:46 +0200 Toralf F__rster <toralf.foerster@....de> wrote:
> 
> > Hello,
> > 
> > the build (.config attached) failed, make ends with :
> > ...
> >   AS      arch/x86/lib/thunk_32.o
> >   CC      arch/x86/lib/usercopy_32.o
> >   AR      arch/x86/lib/lib.a
> >   LD      vmlinux.o
> >   MODPOST vmlinux.o
> > WARNING: modpost: Found 13 section mismatch(es).
> > To see full details build your kernel with:
> > 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> >   GEN     .version
> >   CHK     include/linux/compile.h
> >   UPD     include/linux/compile.h
> >   CC      init/version.o
> >   LD      init/built-in.o
> >   LD      .tmp_vmlinux1
> > drivers/built-in.o: In function `pnp_port_start':
> > /home/tfoerste/devel/linux-2.6/include/linux/pnp.h:51: undefined reference to `pnp_get_resource'
> > make: *** [.tmp_vmlinux1] Error 1
> > 
> 
> y:/usr/src/25> grep PNP .config 
> y:/usr/src/25> grep pnp_port_start $(find . -name '*.o')
> Binary file ./drivers/built-in.o matches
> Binary file ./drivers/telephony/built-in.o matches
> Binary file ./drivers/telephony/ixj.o matches
> Binary file ./vmlinux.o matches
> 
> I assume that drivers/telephony/ixj.c needs to depend on PNP.
>...

No, it does not need this dependency.

CONFIG_OPTIMIZE_INLINING broke it, and Bjorn has already done a fix 
(it's silly to get an out-of-line pnp_port_start() function only due to 
it having two callers in one source file, but that is what gcc 4.2 does 
as "optimized inlining"...).

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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