BUG: v2.4.1 missing EXPORT_SYMBOL

BUG: v2.4.1 missing EXPORT_SYMBOL

[Eric Kasten]

Hi,

Quick bug report for kernel 2.4.1.  There needs to be a
EXPORT_SYMBOL(name_to_kdev_t); at the bottom of linux/init/main.c.
name_to_kdev_t is used by the md driver (and maybe others).  If the
driver is built as a module it won't load due to the missing symbol.

...Eric

Eric Kasten
kasten@nscl.msu.edu
National Superconducting Cyclotron Lab
(517) 333-6412
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Re: v2.4.1 missing EXPORT_SYMBOL

[Ken Sandars]

----- Original Message -----
From: "Eric Kasten" <kasten@nscl.msu.edu>
To: <linux-kernel@vger.kernel.org>
Sent: Wednesday, January 31, 2001 8:44 PM
Subject: BUG: v2.4.1 missing EXPORT_SYMBOL


> Hi,
>
> Quick bug report for kernel 2.4.1.  There needs to be a
> EXPORT_SYMBOL(name_to_kdev_t); at the bottom of linux/init/main.c.
> name_to_kdev_t is used by the md driver (and maybe others).  If the
> driver is built as a module it won't load due to the missing symbol.
>
> ...Eric
>
> Eric Kasten
> kasten@nscl.msu.edu
> National Superconducting Cyclotron Lab
> (517) 333-6412
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/
>
Thanks, Eric

That does the trick for me.

Ken Sandars
ksandars@eurologic.com
Eurologic Systems
+44 117 930 9621

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Re: BUG: v2.4.1 missing EXPORT_SYMBOL

[Keith Owens]

On Wed, 31 Jan 2001 15:44:29 -0500 (EST), 
Eric Kasten <kasten@nscl.msu.edu> wrote:
>Quick bug report for kernel 2.4.1.  There needs to be a
>EXPORT_SYMBOL(name_to_kdev_t); at the bottom of linux/init/main.c.
>name_to_kdev_t is used by the md driver (and maybe others).  If the
>driver is built as a module it won't load due to the missing symbol.

Don't blame us when the driver gets an oops.  name_to_kdev_t is defined
__init so the code is discarded after boot and the area is reused as
scratch space.  You must not EXPORT_SYMBOL() any __init or __exit code.

The only place name_to_kdev_t is used in md is in the md_setup routine,
that routine probably only makes sense when md is built in, not when md
is a module.  I recommend wrapping md_setup and all its data in #ifndef
MODULE.

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Re: BUG: v2.4.1 missing EXPORT_SYMBOL

[Eric Kasten]

> On Wed, 31 Jan 2001 15:44:29 -0500 (EST), 
> Eric Kasten <kasten@nscl.msu.edu> wrote:
> >Quick bug report for kernel 2.4.1.  There needs to be a
> >EXPORT_SYMBOL(name_to_kdev_t); at the bottom of linux/init/main.c.
> >name_to_kdev_t is used by the md driver (and maybe others).  If the
> >driver is built as a module it won't load due to the missing symbol.
> 
> Don't blame us when the driver gets an oops.  name_to_kdev_t is defined
> __init so the code is discarded after boot and the area is reused as
> scratch space.  You must not EXPORT_SYMBOL() any __init or __exit code.
> 
> The only place name_to_kdev_t is used in md is in the md_setup routine,
> that routine probably only makes sense when md is built in, not when md
> is a module.  I recommend wrapping md_setup and all its data in #ifndef
> MODULE.

Which is fine by me.  I'm not using the md driver much on 2.4.1 at the
moment -- just testing to make sure that most of the things that I'll
use in the longer run are working.  Hence, pass on what I know of the
problem and what appears to fix it and hopefully get a bit of a review
by those buried deeper in the kernel than I am (have time to be)
at the moment (which you have aptly provided).

Thanks.

...Eric

Eric Kasten
kasten@nscl.msu.edu
National Superconducting Cyclotron Lab
(517) 333-6412
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