netdev - Re: [irda-users] [PATCH] [IrDA] Fix IrDA build failure

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Message-ID: <20070717050812.GA3801@stusta.de>
Date:	Tue, 17 Jul 2007 07:08:12 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Samuel Ortiz <samuel.ortiz@...idboot.com>
Cc:	davem@...emloft.net, sam@...nborg.org, stable@...nel.org,
	eric.y.miao@...il.com, irda-users@...ts.sourceforge.net,
	netdev@...r.kernel.org
Subject: Re: [irda-users] [PATCH] [IrDA] Fix IrDA build failure

On Mon, Jul 16, 2007 at 04:00:52PM +0300, Samuel Ortiz wrote:
> On Mon, Jul 16, 2007 at 02:17:15PM +0300, Samuel Ortiz wrote:
> > Hi Dave,
> > 
> > When having built-in IrDA, we hit the following error:
> > 
> > `irda_sysctl_unregister' referenced in section `.init.text' of
> > net/built-in.o: defined in discarded section `.exit.text' of
> > net/built-in.o
> > `irda_proc_unregister' referenced in section `.init.text' of
> > net/built-in.o: defined in discarded section `.exit.text' of
> > net/built-in.o
> > `irsock_cleanup' referenced in section `.init.text' of net/built-in.o:
> > defined in discarded section `.exit.text' of net/built-in.o
> > `irttp_cleanup' referenced in section `.init.text' of net/built-in.o:
> > defined in discarded section `.exit.text' of net/built-in.o
> > `iriap_cleanup' referenced in section `.init.text' of net/built-in.o:
> > defined in discarded section `.exit.text' of net/built-in.o
> > `irda_device_cleanup' referenced in section `.init.text' of
> > net/built-in.o: defined in discarded section `.exit.text' of
> > net/built-in.o
> > `irlap_cleanup' referenced in section `.init.text' of net/built-in.o:
> > defined in discarded section `.exit.text' of net/built-in.o
> > `irlmp_cleanup' referenced in section `.init.text' of net/built-in.o:
> > defined in discarded section `.exit.text' of net/built-in.o
> > make[1]: *** [.tmp_vmlinux1] Error 1
> > make: *** [_all] Error 2
> > 
> > This is due to the irda_init fix recently added, where we call __exit
> > routines from an __init one. It is a build failure that I didn't catch
> > because it doesn't show up when building IrDA as a module. My apologies
> > for that.
> I forgot to mention that the build fails on ARM but not on x86. As Sam
> explained to me, x86 discards exit sections at runtime only, unlike ARM.
> I don't know about other platforms though.
> 
> So, to hit this build failure, you need a combination of !x86 and
> built-in IrDA.

On i386 these are runtime failures (although in unlikely error paths) 
which isn't better.

> Cheers,
> Samuel.

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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