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16952b77d8
syncconfig updates the .config only when sym_change_count > 0, i.e.
any change in config symbols has been detected.
Not only symbols but also comments are contained in the .config file.
If only comments are updated, they are not fed back to the .config,
then the stale comments are left-over. Of course, this is just a
matter of comments, but why not fix it.
I see some scenarios where this happens.
Scenario A:
1. You have a source tree that has already been configured.
2. Linus increments the version number in the top-level Makefile
(i.e. he commits a new release)
3. You pull it, and run 'make'
4. syncconfig is invoked because the environment variable,
KERNELVERSION is updated, but the .config is not updated since
no config symbol is changed.
5. The .config file contains a kernel version in the top line:
# Automatically generated file; DO NOT EDIT.
# Linux/arm64 4.18.0-rc2 Kernel Configuration
... which points to a previous version.
Scenario B:
1. You have a source tree that has already been configured.
2. You upgrade the compiler, but it still has the same version number.
This may happen if you regularly build the latest compiler from
the source code.
3. You run 'make'
4. syncconfig is invoked because the environment variable,
CC_VERSION_TEXT is updated, but the .config is not updated since
no config symbol is changed.
5. The .config file contains the version string of the compiler:
#
# Compiler: aarch64-linux-gcc (GCC) 9.0.0 20180628 (experimental)
#
... which carries the information of the old compiler.
If KCONFIG_NOSILENTUPDATE is set, syncconfig is not allowed to update
the .config file. Otherwise, it is fine to update it regardless of
sym_change_count.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.