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67 lines
3.3 KiB
Plaintext
67 lines
3.3 KiB
Plaintext
This file tries to document how the `mkpatch' program works.
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The file in copyright (c) 1999 by Frodo Looijaard
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mkpatch compares the newest lm_sensors sources with what is found in a kernel,
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and generates a set of diffs. These diffs can be amplied to that kernel,
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after which the kernel is synchronised with the current lm_sensors sources.
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You should always run mkpatch against a kernel tree that has been patched
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for the newest I2C sources.
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mkpatch needs two arguments. The first is the root of the lm_sensors package,
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the second is the root of Linux kernel tree. For example:
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cd /tmp/lm_sensors-2.4.0
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mkpatch/mkpatch . /usr/src/linux
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The patch file is written to stdout; any errors are written to stderr.
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So you will want to capture the output:
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mkpatch/mkpatch . /usr/src/linux > /tmp/lm_sensors-diffs
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Later on, you will want to apply the diffs:
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cd /usr/src/linuc
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patch -p1 -E < /tmp/lm_sensors-diffs
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Of course, this can be combined:
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mkpatch/mkpatch . /usr/src/linux | patch -d /usr/src/linux -p1 -E
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mkpatch uses several files in the mkpatch subdirectory. The location of
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these files is hardcoded in the program, but all other files used are
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specified in these files, and can easily be changed. Used files are:
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FILES
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a list of files that will be considered by mkpatch. Each line contains
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two filenames, separated by whitespace. The first is the name and
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location (relative to the lm_sensors package root) of the lm_sensors
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file, the second is the name and location (relative to the kernel root) of
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the kernel file. A diff will be created between these two files.
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INCLUDES
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A list of include file changes. Each line contains two strings that
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can be found after a `#include' statement. All occurences of the
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first string will be changed to the second, for all lm_sensors files in
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FILES, before the normal diff is generated. This allow us to use
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`#include "sensors.h"' when compiling in the package tree, and
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`#include <linux/sensors.h>' in the kernel tree.
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Makefile, Config.in
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These files are new and will be copied to the appropriate place as
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specified in FILES.
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mkpatch does several things:
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* For each file pair as specified in FILES, it creates a diff between
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them, but before that is done, it changes `#include' lines in the
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lm_sensors file as specified in INCLUDES
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* It handles several special files, that have to be scanned explicitely
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to generate diffs to for them
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The generated diffs have specific headers. It will seem as if the old
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kernel was contained in the `linux-old' directory, and the new patched
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kernel in the `linux' directory, regardless of where the kernel was
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actually located.
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Most intricate are the special files that are handled. These special
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files were already present in the kernel, but had to be patched. Because
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they can change between kernel versions, I had to scan them by hand to
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find where the new code should be inserted. Each file has documented
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what actually happens.
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One special other thing is done for each of the files specified in FILES.
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The include-file `compat.h' is removed from each source file, and explicit
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compatibility statements are added. The files are scanned for that, to
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see what compatibility statements are needed. In a future version, you
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will be able to specify which of those you want.
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