[Bug 454462] Review Request: ksplice - Patching a Linux kernel without reboot

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Summary: Review Request: ksplice - Patching a Linux kernel without reboot


https://bugzilla.redhat.com/show_bug.cgi?id=454462





------- Additional Comments From thomas.moschny at gmx.de  2008-07-31 10:40 EST -------
Unfortunately, there are no kernel-source rpms anymore. So, basically, the
procedure is as follows:

- download the proper source rpm for the running kernel:
  "yumdownloader --source kernel-`uname -r`"
- install it: rpm -ivh kernel-*.src.rpm
- prep it: cd `rpm --eval '%{_specdir}'` && 
  rpmbuild --with baseonly -bp --target=`uname -m` kernel.spec

In %{_builddir}/kernel-2.6.25/linux-2.6.25.`uname -m` there is an almost usable
tree after that, and one could proceed with the ksplice tutorial (i.e. make a
ksplice subdir, copy the right System.map and .config from /boot there, modify
some files, or get the desired patch, and finally call ksplice-create). 

There's one gotcha though: that kernel tree's EXTRAVERSION is empty, (it is
being set in %build, not in %prep), and thus the generated ksplice modules can
only forcefully be loaded into the running kernel because of a version magic
mismatch.

So if you've got enough time, use -bc instead of -bp. That actually builds the
complete kernel, but then you can be quite sure that the resulting tree matches
that of the running kernel.

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