Maintenance script: Created page with " === Info === http://wiki.centos.org/HowTos/Custom_Kernel === Patch the kernel === Mainly to include new hardware drivers (eg 3ware controller) *prepare **download ke..."

2015-08-26T12:28:55Z

Created page with " === Info === *http://wiki.centos.org/HowTos/Custom_Kernel === Patch the kernel === *Mainly to include new hardware drivers (eg 3ware controller) *prepare **download ke..."

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=== Info ===
*http://wiki.centos.org/HowTos/Custom_Kernel

=== Patch the kernel ===
*Mainly to include new hardware drivers (eg 3ware controller)
*prepare
**download kernel source rpms and install them
**then (maybe check also if there are no different versions of the kernel source on the machine, so you are sure this spec file is the one you need!)
<pre>
cd /usr/src/redhat/SPECS
cp kernel-2.6.spec kernel-2.6.spec-orig
rpmbuild -bp kernel-2.6.spec
</pre>
**now you have the OS patched kernel in
<pre>
/usr/src/redhat/BUILD/
</pre>
*patch
**3ware
**get the drivers you need for your kernel release
**untar files
**make a copy of the kernel tree
<pre>
cd /usr/src/redhat/BUILD/kernel-<version>
cp -R linux-<version> linux2-<version>
</pre>
**copy the new <tt>3w-9xxx.c</tt> and <tt>3w-9xxx.h</tt> files to <tt>/usr/src/redhat/BUILD/kernel-<version>/linux2-<version>/drivers/scsi</tt>
**goto <tt>/usr/src/redhat/BUILD/kernel-<version></tt> and make the patch with (the order is <tt>diff old new</tt>
<pre>
diff -ur linux-<version> linux2-<version> > 3w-<driver version>-<kernel version>.patch
</pre>
**copy the 3ware patch file to <tt>/usr/src/redhat/SOURCES</tt>
**goto <tt>/usr/src/redhat/SPECS</tt> and open the <tt>kernel-2.6.spec</tt> file
**you need to change the name of the kernel by modifying some version number
***for centos plus kernels, you can add your own identfer to the <tt>%define dist</tt> field.
***locate the last patch in the spec file. Look for the last line which starts with <tt>Patch<digits>: <some filename></tt>
***create a new Patch entry pointing to the 3w patch file you made. the path is relative to <tt>/usr/src/redhat/SOURCE</tt>
****don't use any of the Patch999XX ranges, use something lower.
***locate the equivalent last <tt>%patch<digits></tt> entry and insert your new patch <tt>%patch<the patchnumber you choose> -p1</tt>
**as an example, for centos 5.1 x86_64, the changes were
<pre>
[root@fireman SPECS]# diff -u kernel-2.6.spec-orig kernel-2.6.spec
--- kernel-2.6.spec-orig 2008-01-17 12:20:42.000000000 +0100
+++ kernel-2.6.spec 2008-01-17 12:48:06.000000000 +0100
@@ -49,7 +49,7 @@
# After branching, please hardcode these values as the
# %dist and %rhel tags are not reliable yet
# For example dist -> .el5 and rhel -> 5
-%define dist .el5.centos.plus
+%define dist .el5.centos.plus.iihe
%define rhel 5

# Values used for RHEL version info in version.h
@@ -1601,6 +1601,8 @@
Patch21841: linux-2.6-ppc-system-cpus-stuck-in-h_join-after-migrating.patch
Patch21842: linux-2.6-fs-missing-dput-in-do_lookup-error-leaks-dentries.patch
Patch21843: linux-2.6-net-tg3-fix-performance-regression-on-5705.patch
+
+Patch30000: 3w-9.5.0-2.6.18.patch
# adds rhel version info to version.h
Patch99990: linux-2.6-rhel-version-h.patch
# empty final patch file to facilitate testing of kernel patches
@@ -3191,6 +3193,8 @@
%patch21841 -p1
%patch21842 -p1
%patch21843 -p1
+%patch30000 -p1
+
# correction of SUBLEVEL/EXTRAVERSION in top-level source tree Makefile
# patch the Makefile to include rhel version info
%patch99990 -p1
</pre>
*you are now ready to rebuild the kernel rpms
**to build all releases, run
<pre>
rpmbuild -bb kernel-2.6.spec >& out
</pre>
**this might take a while, you can later check the output file if your patch didn't cause any issues during the build.
***you can follow the state with
<pre>
tail -f out
</pre>
***be aware of the following message (it can stop/delay the process).
<pre>
Not enough random bytes available. Please do some other work to give
the OS a chance to collect more entropy!
</pre>

==== Post config ====
*since you build a new kernel release, it might be necessary to rebuild depending kernel modules, like XFS
**install the devel-rpms from your new kernel
**use <tt>rpm -i</tt> to keep the current kernel rpms on the box.
**get and install the source rpms for your modules
**goto <tt>/usr/src/redhat/SPECS</tt> and run
<pre>
rpmbuild --define "kversion <the complete new kernel version>" module.spec
</pre>
**eg for centos 5.1 example above with the XFS module
<pre>
rpmbuild -bb --define "kversion 2.6.18-53.1.4.el5.centos.plus.iihe" kmod-xfs.spec
</pre>

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PatchKernel - Revision history

Maintenance script: Created page with " === Info === *http://wiki.centos.org/HowTos/Custom_Kernel === Patch the kernel === *Mainly to include new hardware drivers (eg 3ware controller) *prepare **download ke..."

Maintenance script: Created page with " === Info === http://wiki.centos.org/HowTos/Custom_Kernel === Patch the kernel === Mainly to include new hardware drivers (eg 3ware controller) *prepare **download ke..."