linux-kernel - Re: nfs: __setup_str_nfs_root_setup causes a section type conflict

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Message-Id: <200908032257.51739.elendil@planet.nl>
Date:	Mon, 3 Aug 2009 22:57:49 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	parisc-linux@...ts.parisc-linux.org, Helge Deller <deller@....de>
Subject: Re: nfs: __setup_str_nfs_root_setup causes a section type conflict

On Monday 03 August 2009, Trond Myklebust wrote:
> On Mon, 2009-08-03 at 21:21 +0200, Frans Pop wrote:
> > On Monday 03 August 2009, Trond Myklebust wrote:
> > > > > /home/fjp/projects/kernel/linux-2.6/fs/nfs/nfsroot.c:403:
> > > > >     error: __setup_str_nfs_root_setup causes a section type
> > > > > conflict
> > >
> > > If you do a 'make fs/nfs/nfsroot.i', and then look at the resulting
> > > file fs/nfs/nfsroot.i, what does the line that defines
> > > '__setup_str_nfs_root_setup' look like?
> >
> > $ grep __setup_str_nfs_root_setup fs/nfs/nfsroot.i
> >
> > static const char __setup_str_nfs_root_setup[] __attribute__
> > ((__section__(".init.rodata"))) __attribute__((aligned(1))) = "nfsroot=";
> > static struct obs_kernel_param __setup_nfs_root_setup __attribute__((__used__))
> > __attribute__ ((__section__(".init.setup")))
> > __attribute__((aligned((sizeof(long))))) = { __setup_str_nfs_root_setup,
> > nfs_root_setup, 0 }; 
>
> Yup. That matches what I get on an x86_64 platform, where it appears to
> compile without any trouble. I can see no reason why it shouldn't
> compile on parisc too. In fact you should have tons of these in
> init/do_mounts.c: do they generate compile errors too?

Yes, that does have similar constructs, but that does compiles OK:

$ make init/do_mounts.o
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-parisc
  CALL    scripts/checksyscalls.sh
  CC      init/do_mounts.o

while:

$ make fs/nfs/nfsroot.o
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-parisc
  CALL    scripts/checksyscalls.sh
  CC      fs/nfs/nfsroot.o
fs/nfs/nfsroot.c:403: error: __setup_str_nfs_root_setup causes a section type 
conflict
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