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SubjectRe: Error "Unknown relocation: 36" on module load on Sparc
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From: Vladislav Bolkhovitin <vst@vlnb.net>
Date: Wed, 16 Jun 2010 23:05:41 +0400

> We in SCST project have a very strange problem on Sparc. Our main
> module scst.ko, if built as a module out of the kernel tree, can't be
> loaded and "modprobe scst" returns:
>
> FATAL: Error inserting scst
> (/lib/modules/2.6.26-2-sparc64/extra/scst.ko): Invalid module format
>
> The following message is immediately spit out by the kernel:
> [ 1686.676534] module scst: Unknown relocation: 36

You're building the module with incorrect compiler flags, in
particular somehow the "-mcmodel=medlow" option is not getting passed
into the module build and thus the wrong code model is being used to
build the module.

There are a host of other sparc64 specific compiler options that must
be present for a correct build as well. The only way to get it done
correctly is to properly inherit the option settings made by
arch/sparc/Makefile and friends in the kernel tree.


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