9. Linux Kernel
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9. Linux Kernel

	Latest Release Notes on the Web
	These release notes may be updated. Visit http://docs.fedoraproject.org/release-notes/ to view the latest release notes for Fedora.

This section covers changes and important information regarding the 2.6.23 based kernel in Fedora 8. The 2.6.23 kernel includes:

Tickless support for x86 64-bit systems (32-bit was added previously), which greatly improves power management.
Some elements of the realtime kernel project.
The kernel spec file is now named kernel.spec rather than kernel-2.6.spec.
The kernel spec file has new macros that ease the kernel building process. Refer to http://fedoraproject.org/wiki/Docs/CustomKernel for further information.
The kernel in Fedora 8 no longer loads modules by default for ISA sound cards. Load the module by hand using the command modprobe module-name, or put an entry in /etc/modprobe.conf. For example, for the Creative SoundBlaster AWE64, add the following entry:
```
install snd-sbawe
```

9.1. Version

Fedora may include additional patches to the kernel for improvements, bug fixes, or additional features. For this reason, the Fedora kernel may not be line-for-line equivalent to the so-called vanilla kernel from the kernel.org web site:

http://www.kernel.org/

To obtain a list of these patches, download the source RPM package and run the following command against it:

rpm -qpl kernel-<version>.src.rpm

9.2. Changelog

To retrieve a log of changes to the package, run the following command:

rpm -q --changelog kernel-<version>

If you need a user friendly version of the changelog, refer to http://wiki.kernelnewbies.org/LinuxChanges. A short and full diff of the kernel is available from http://kernel.org/git. The Fedora version kernel is based on the Linus tree.

Customizations made for the Fedora version are available from http://cvs.fedoraproject.org.

9.3. Kernel Flavors

Fedora 8 includes the following kernel builds:

Native kernel, for use in most systems. Configured sources are available in the kernel-devel package.
The kernel-PAE, for use in 32-bit x86 systems with more than 4GB of RAM, or with CPUs that have an NX (No eXecute) feature. This kernel support both uniprocessor and multi-processor systems. Configured sources are available in the kernel-PAE-devel package.
Virtualization kernel for use with the Xen emulator package. Configured sources are available in the kernel-xen-devel package.
The kdump kernel for use with kexec/kdump capabilities. Configured sources are available in the kernel-kdump-devel package.

You may install kernel headers for all kernel flavors at the same time. The files are installed in the /usr/src/kernels/version[-PAE|-xen|-kdump]-arch/ tree. Use the following command:

su -c 'yum install kernel{,-PAE,-xen,-kdump}-devel'

Select one or more of these flavors, separated by commas and no spaces, as appropriate. Enter the root password when prompted.

	32bit Kernel Includes Kdump
	The 32bit kernel is now relocatable, so kdump functionality is included. 64bit still requires installation of the -kdump kernel.

	Default Kernel Provides SMP
	There is no separate SMP kernel available for Fedora on i386, x86_64, and ppc64. Multiprocessor support is provided by the native kernel.

	PowerPC Kernel Support
	There is no support for Xen or kdump for the PowerPC architecture in Fedora. 32-bit PowerPC does still have a separate SMP kernel.

9.4. Reporting Bugs

Refer to http://kernel.org/pub/linux/docs/lkml/reporting-bugs.html for information on reporting bugs in the Linux kernel. You may also use http://bugzilla.redhat.com for reporting bugs that are specific to Fedora.

9.5. Preparing for Kernel Development

Fedora 8 does not include the kernel-source package provided by older versions since only the kernel-devel package is required now to build external modules. Configured sources are available, as described Section 9.3, “Kernel Flavors”.

	Custom Kernel Building
	For information on kernel development and working with custom kernels, refer to http://fedoraproject.org/wiki/Docs/CustomKernel.

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