| ksplice-create(8) - phpMan
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 AT 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 2014-01-19 KSPLICE-CREATE(8)
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