Question

I have some trouble getting this particular kernel patch to compile correctly with my Ubuntu Linux kernel.

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 patch -p1 < put_page_callback-2.6.32.patch but when I got to compile I get about an hour in or so and then make fails and returns these errors.

/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

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 scst_exec_req_fifo-2.6.32.patch. So I can make this iSCSI target run at full speed.

Any idea what I can do?

** UPDATE **

I am following the insructions from https://help.ubuntu.com/community/Kernel/Compile. More specificly a link on that page that goes to http://blog.avirtualhome.com/2010/05/05/how-to-compile-a-ubuntu-lucid-kernel/.

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.

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 http://scst.sourceforge.net/index.html

Answer 1

You should follow the standard kernel compilation method after getting yourself an appropriate kernel version from kernel.org

Here are the steps in order

1. Extract kernel to a folder
2. Apply patch
3. sudo make menuconfig, save default .config file
4. sudo make
5. sudo make modules_install
6. sudo make install
7. cd /boot
8. sudo mkinitramfs -o initrd.img-(your version here) (your version again)
9. sudo update-grub

You should now see the new kernel in your boot options and it should (hopefully) boot.