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    <p>Finally, I got it. Thanks to shodanex for putting me on the right track.</p> <p><strong><em>Update:</em></strong> Be very careful when applying this fix to builds for older versions of kernel, as there is a bug in <strong>Makefile.modpost</strong> file in older versions of the kernel which makes your build misbehave and build wrong targets when you specify <strong>KBUILD_EXTMOD</strong> option. </p> <p>You have to specify the paths to the source of the modules you depend on in <strong>KBUILD_EXTMOD</strong> make parameter.</p> <p>Say, you have a module <strong>foo</strong> that depends on symbols from module <strong>bar</strong>.</p> <p>Source files for <strong>foo</strong> are in <strong>foo/module/</strong> and source files for bar are in <strong>bar/module/</strong></p> <p>The make command in <strong>Makefile</strong> for <strong>foo</strong> probably looks like </p> <pre><code>make ARCH=$$ARCH CROSS_COMPILE=$$CROSS_COMPILE -C $$LINUX_DIR \ M=`pwd`/module \ modules </code></pre> <p>(the exact line may differ in your project).</p> <p>Change it to </p> <pre><code>make ARCH=$$ARCH CROSS_COMPILE=$$CROSS_COMPILE -C $$LINUX_DIR \ M=`pwd`/module \ KBUILD_EXTMOD=`pwd`/../bar/module \ modules </code></pre> <p>(we added the KBUILD_EXTMOD=<code>pwd</code>/../bar/module \ line, where <code>pwd</code>/../bar/module is a path to sources of kernel module we depend on.</p> <p>One would expect <strong>KBUILD_EXTRA_SYMBOLS</strong> parameter to work this way, however it's <strong>KBUILD_EXTMOD</strong>.</p>
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    1. POlinux kernel module linker warnings: "*** Warning: <function> [<module>] undefined!" - any way to get rid of them?
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    1. COfrom which version of linux does this start to work? i tried to use this method on 2.6.12 kernel building external modules, but to no avail, it only build to bar modules, totally ignore the foo module, any help?
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      1. USandycjw
    2. COKBUILD_EXTMOD is synonymous with M (and SUBDIRS) which is why it builds the bar module. Use KBUILD_EXTRA_SYMBOLS as per sinojs reply.
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      1. USPer Knytt
 

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