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POLinux kernel patching issue
 

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  1. POLinux kernel patching issue
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    <p>I have some trouble getting this particular kernel patch to compile correctly with my Ubuntu Linux kernel.</p> <p>The patch in question comes from a piece of software called SCST it a iSCSI target for Linux. The patch loads fine when I run <code>patch -p1 &lt; put_page_callback-2.6.32.patch</code> but when I got to compile I get about an hour in or so and then make fails and returns these errors.</p> <pre><code>/root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:63: error: redefinition of '__kcrctab_net_get_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:14: note: previous definition of '__kcrctab_net_get_page_callback' was here /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:63: error: redefinition of '__kstrtab_net_get_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:14: note: previous definition of '__kstrtab_net_get_page_callback' was here /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:63: error: redefinition of '__ksymtab_net_get_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:14: note: previous definition of '__ksymtab_net_get_page_callback' was here /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:66: error: redefinition of '__kcrctab_net_put_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:17: note: previous definition of '__kcrctab_net_put_page_callback' was here /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:66: error: redefinition of '__kstrtab_net_put_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:17: note: previous definition of '__kstrtab_net_put_page_callback' was here /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:66: error: redefinition of '__ksymtab_net_put_page_callback' /root/d1/development/kernel/lucid/source/net/ipv4/tcp_zero_copy.c:17: note: previous definition of '__ksymtab_net_put_page_callback' was here </code></pre> <p>and I have absolutley no idea what is going on. I am not a kernel dev by any means, I am just trying to get this patch and another one which works fine <code>scst_exec_req_fifo-2.6.32.patch</code>. So I can make this iSCSI target run at full speed.</p> <p>Any idea what I can do?</p> <p>** UPDATE **</p> <p>I am following the insructions from <a href="https://help.ubuntu.com/community/Kernel/Compile" rel="nofollow">https&#58;//help.ubuntu.com/community/Kernel/Compile</a>. More specificly a link on that page that goes to <a href="http://blog.avirtualhome.com/2010/05/05/how-to-compile-a-ubuntu-lucid-kernel/" rel="nofollow">http&#58;//blog.avirtualhome.com/2010/05/05/how-to-compile-a-ubuntu-lucid-kernel/</a>.</p> <p>I have already done a few compiles using these instructions, my problems were either I forgot to apply the patches or the patch did not take, but up until now they always completed. Something with this new patch messed something up.</p> <p>As far as why the iSCSI target is messing with the network parts, it apperantly has something to do with the network performance. When I compile the target software without the patch it whines about the performance wont be good. The website for the target is <a href="http://scst.sourceforge.net/index.html" rel="nofollow">http&#58;//scst.sourceforge.net/index.html</a></p>
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    1. COIt looks like there may be a bad #define guard somewhere and its redefining some symbols. Can you show us how you build? iSCSI target shouldnt be messing with any ipv4 things which is why I'm curious. Also which linux distro are you building on? (I've had issues where people tell me my kernel doesnt build on 11.04 ubuntu correctly, still not sure why because pre compiled version boots fine)
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    2. COI will write more in the question, but the basics are: Ubuntu 2.6.32-34.74 from the Ubuntu GIT repo, its based on Lucid Lynx.
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    3. COJust for kicks I tried applying the patch for 2.6.33 instead, and it made it worse. My thinking in that was the other one might be a bit closer to my kernel with is much higher in minor version than the one the SCST patch for 2.6.32 was generated from. But like I said it did not work. So I use my VM snapshot to go backwards.
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