[uml-devel] Unknown symbols

[uml-devel] Unknown symbols

[Bodo Stroesser]

Building 2.6.9 with vsyscall, I got problems with unknown symbols, e.g:

     ext3: Unknown symbol vsyscall_end
     ext3: Unknown symbol vsyscall_ehdr

for (almost) all modules, my current config uses.
The same problem exists for "end_iomem", but in the modules xfs.ko and ntfs.ko only.

I tried to fix that for the vsyscall_xxx in arch/um/os-Linux/elf_aux.c. I inserted
EXPORT_SYMBOLS for them, but it failed to compile, because it's not possible to
include "linux/module.h" in this user-code module.

What should I do to fix this? Move the variables to a kernel-source-file?
Or moving the EXPORTs only? To what file do you think that it should be moved?

For end_iomem inserting a EXPORT_SYMBOLS in arch/um/kernel/um_arch.c seems to be
enough.

Bodo


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[uml-devel] Re: Unknown symbols

[BlaisorBlade]

On Friday 22 October 2004 21:16, Bodo Stroesser wrote:
> Building 2.6.9 with vsyscall, I got problems with unknown symbols, e.g:

>      ext3: Unknown symbol vsyscall_end
>      ext3: Unknown symbol vsyscall_ehdr

> for (almost) all modules, my current config uses.
> The same problem exists for "end_iomem", but in the modules xfs.ko and
> ntfs.ko only.

> I tried to fix that for the vsyscall_xxx in arch/um/os-Linux/elf_aux.c. I
> inserted EXPORT_SYMBOLS for them, but it failed to compile, because it's
> not possible to include "linux/module.h" in this user-code module.

> What should I do to fix this? Move the variables to a kernel-source-file?
> Or moving the EXPORTs only? To what file do you think that it should be
> moved?

The EXPORT_SYMBOL can be in any kernel space file, if you have declared the 
function before.

Since the functions are in arch/um/os-Linux, they could go in 
arch/um/os-Linux/user_syms.c.

In general, if you have a kernelspace file related to the userspace file, you 
put the EXPORT_SYMBOLS in the kernel-space file.

> For end_iomem inserting a EXPORT_SYMBOLS in arch/um/kernel/um_arch.c seems
> to be enough.

Yes, I guess. Send the resulting patch to Jeff - as a separate one.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] Re: Unknown symbols

[Jeff Dike]

On Sat, Oct 23, 2004 at 03:16:16AM +0200, BlaisorBlade wrote:
> > For end_iomem inserting a EXPORT_SYMBOLS in arch/um/kernel/um_arch.c seems
> > to be enough.
> 
> Yes, I guess. Send the resulting patch to Jeff - as a separate one.

Those are userspace things, so they go in user_syms.c - that already has the
export crap copied into it.

				Jeff


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Re: [uml-devel] Re: Unknown symbols

[Bodo Stroesser]

Jeff Dike wrote:
> On Sat, Oct 23, 2004 at 03:16:16AM +0200, BlaisorBlade wrote:
> 
>>>For end_iomem inserting a EXPORT_SYMBOLS in arch/um/kernel/um_arch.c seems
>>>to be enough.
>>
>>Yes, I guess. Send the resulting patch to Jeff - as a separate one.
> 
> 
> Those are userspace things, so they go in user_syms.c - that already has the
> export crap copied into it.
> 
> 				Jeff
OK. Here is the first patch. It handles end_iomem only. Since end_iomem is
located in arch_um.c, I prefered to put the EXPORT_SYMBOL into ksyms.c.

I hope, you agree.

The EXPORTs for vsyscall_* are included in a separate patch. It's mailed in
the vsyscall-thread, because it includes some improvement for vsyscall also.

---

diff -puNr a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
--- a/arch/um/kernel/ksyms.c	2004-10-18 23:53:08.000000000 +0200
+++ b/arch/um/kernel/ksyms.c	2004-10-25 14:23:32.811120267 +0200
@@ -48,6 +48,7 @@ EXPORT_SYMBOL(to_virt);
  EXPORT_SYMBOL(mode_tt);
  EXPORT_SYMBOL(handle_page_fault);
  EXPORT_SYMBOL(find_iomem);
+EXPORT_SYMBOL(end_iomem);

  #ifdef CONFIG_MODE_TT
  EXPORT_SYMBOL(strncpy_from_user_tt);


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