KSPLICE-CREATE(8)						      Ksplice							 KSPLICE-CREATE(8)

NAME

       ksplice-create - Create a set of kernel modules for a rebootless kernel update

SYNOPSIS

       ksplice-create [OPTIONS] --patch=PATCH_FILE KERNEL_SOURCE

       ksplice-create [OPTIONS] --diffext=EXTENSION KERNEL_SOURCE

       ksplice-create [OPTIONS] --git=COMMIT KERNEL_SOURCE

       ksplice-create [OPTIONS] --prebuild KERNEL_SOURCE

DESCRIPTION

       ksplice-create creates a set of Ksplice kernel modules that, when loaded, will apply a user-specified source code patch to the running
       binary kernel.

       Before you use ksplice-create on a patch, you should confirm that the desired source code change does not make any semantic changes to
       kernel data structures--that is, changes that would require existing instances of kernel data structures to be transformed (e.g., a patch
       that adds a field to a global data structure would require the existing data structures to change).  If you use Ksplice on a patch that
       changes data structure semantics, Ksplice will not detect the problem and you could experience kernel problems as a result.

       The to-be-applied source code patch can be specified by providing a patch(1) file (--patch=PATCH_FILE) or by providing a file extension
       (--diffext=EXTENSION).

       If a file extension is specified, then the desired source code patch will be determined by comparing all of the files in the KERNEL_SOURCE
       directory tree whose names end with the extra extension EXTENSION against the corresponding files without the extra extension.  Only the
       new files containing the extra extension in their filenames should be modified.

       Here is an example of using a file extension to specify a patch:

	$ cp KERNEL_SOURCE/kernel/sys.c KERNEL_SOURCE/kernel/sys.c.prctl_fixed
	[edit sys.c.prctl_fixed to include the desired changes]
	$ ksplice-create --diffext=.prctl_fixed KERNEL_SOURCE

       KERNEL_SOURCE must be a directory containing the to-be-updated kernel's original source code.  If your Linux distribution applies patches
       to the Linux kernel during the kernel build process, then those patches must be applied to the KERNEL_SOURCE directory before invoking
       ksplice-create on that directory.  ksplice-create will not modify the source code in the KERNEL_SOURCE directory tree, but it will perform
       a kernel build in that directory tree.

       ORIG_CONFIG can be used to specify the directory containing the to-be-updated kernel's original .config file and original System.map file
       (the files should have exactly those names).  ORIG_CONFIG defaults to KERNEL_SOURCE/ksplice.

       The default gcc(1) compiler and as(1) assembler on the system should be as close to the compiler and assembler originally used to build the
       running kernel as possible.  If the current compiler and linker are too different from the original compiler and linker, ksplice-apply will
       abort when applying the update.

       ksplice-create outputs a tar(1) file, compressed with gzip(1), containing the desired Ksplice update modules.  This tarball will be created
       in the current directory, and it can be manipulated using the other Ksplice utilities, such as ksplice-apply.

       The first time that ksplice-create is invoked on a KERNEL_SOURCE directory, it must build that kernel from scratch, which is much slower
       than the rest of the update-creation process.  --prebuild can be used to perform this initial kernel build without providing a source code
       patch.

       In order to patch a function that has previously been patched by Ksplice, the user needs to ensure that the KERNEL_SOURCE directory
       provided to Ksplice contains the source for the currently running kernel, including any patches that have previously been applied by
       Ksplice.

OPTIONS

       --patch=PATCH_FILE
	       Builds a Ksplice update out of the given patch(1) file PATCH_FILE.

       --diffext=EXTENSION
	       Builds a Ksplice update using the modified source files with names ending in EXTENSION.	The patch will be determined by comparing
	       all of the files in the KERNEL_SOURCE directory tree whose names end with the extra extension EXTENSION against the corresponding
	       files without the extra extension.

       --git=COMMIT
	       Builds a Ksplice update using the commit COMMIT in the Git working tree KERNEL_SOURCE.  The original state corresponding to the
	       running kernel is remembered in the Git ref refs/ksplice/pre, which will be created from the current HEAD if it does not yet exist
	       (and can be changed using the --series option).	Therefore, the source code change to be applied corresponds to the output of git
	       diff ksplice/pre COMMIT.

       --prebuild
	       Compiles the original source code that will be needed to build future Ksplice updates.  If any Ksplice updates have previously been
	       built in the KERNEL_SOURCE tree, the source files in the tree are reverted to their original state.

       --series
	       Specifies that the current state of the KERNEL_SOURCE tree should be used as the original source that corresponds to the running
	       kernel.	If a Ksplice update has recently been built in the KERNEL_SOURCE tree, this option specifies that the Ksplice update being
	       built should be applied after the previous update in series.  This option can be used with --prebuild to forget the previous
	       original state and perform no other action.

       --build-modules
	       For a patch that includes changes to kernel modules, in addition to building a hot update that can be applied to the running
	       kernel, this option will cause ksplice-create to generate a set of new modules based on the updated source code.  These modules can
	       be used to replace the kernel modules stored on disk, where they can later be loaded normally after part of the hot update has been
	       applied using ksplice-apply(1) --partial.

       -v, --verbose
	       Causes ksplice-create to print debugging messages about its progress.  Using multiple -v options increases the verbosity.  The
	       maximum is 2.

       -j JOBS, --jobs=JOBS
	       Specifies the number of jobs to run simultaneously while performing kernel builds.  ksplice-create also honors the environment
	       variable CONCURRENCY_LEVEL.

       --patch-opt=OPTIONS
	       Can be used to pass options to patch(1).  If this option is NOT specified, then -p1 is passed to patch.	If this option is
	       specified, then only the specified options will be passed to patch.  This option can be repeated in order to pass multiple options
	       to patch.  This option is ignored when the to-be-applied source code patch is specified using --diffext.

       --id=ID Specifies the unique value that will be used as the identifier of the Ksplice update.  This identifier will, for example, appear in
	       the name of the update tarball.	By default, a random 8-character ID will be generated.

SEE ALSO

       ksplice-apply(8), ksplice-view(8), ksplice-undo(8)

BUGS

       Please report bugs to <devel@ksplice.com>.

AUTHORS

       Jeff Arnold, Anders Kaseorg, and Tim Abbott

COPYRIGHT

       Copyright (C) 2007-2009	Ksplice, Inc.

       This is free software and documentation.  You can redistribute and/or modify it under the terms of the GNU General Public License, version
       2.

Ksplice v0.9.9							    2011-02-13							 KSPLICE-CREATE(8)