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authorDarren Hart (VMware) <dvhart@infradead.org>2017-11-20 14:39:33 -0800
committerJonathan Corbet <corbet@lwn.net>2017-12-11 15:06:26 -0700
commitb7d4ec395673bf8b21de064f181cc94096e0a0c7 (patch)
tree31c0c407ae86c65f2d72e7bf44220a593530b5bb /Documentation/kbuild
parentd063623b6ae7c326d21a2713dd38cab15d794c1c (diff)
Documentation/kbuild: Add guidance for the use of default
Document the preference [1] for new CONFIG options to "default n" (or not use default at all) in order to minimizes changes to the config, especially to avoid "make oldconfig" growing unnecessarily from release to release. Document the exceptions where it is acceptable to use "default y/m" for new CONFIG options. 1. https://lkml.org/lkml/2017/11/18/257 Cc: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Michal Marek <mmarek@suse.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-kbuild@vger.kernel.org Cc: linux-doc@vger.kernel.org Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/kbuild')
-rw-r--r--Documentation/kbuild/kconfig-language.txt21
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt
index 262722d8867b..688e41ebb4da 100644
--- a/Documentation/kbuild/kconfig-language.txt
+++ b/Documentation/kbuild/kconfig-language.txt
@@ -77,6 +77,27 @@ applicable everywhere (see syntax).
Optionally, dependencies only for this default value can be added with
"if".
+ The default value deliberately defaults to 'n' in order to avoid bloating the
+ build. With few exceptions, new config options should not change this. The
+ intent is for "make oldconfig" to add as little as possible to the config from
+ release to release.
+
+ Note:
+ Things that merit "default y/m" include:
+
+ a) A new Kconfig option for something that used to always be built
+ should be "default y".
+
+ b) A new gatekeeping Kconfig option that hides/shows other Kconfig
+ options (but does not generate any code of its own), should be
+ "default y" so people will see those other options.
+
+ c) Sub-driver behavior or similar options for a driver that is
+ "default n". This allows you to provide sane defaults.
+
+ d) Hardware or infrastructure that everybody expects, such as CONFIG_NET
+ or CONFIG_BLOCK. These are rare exceptions.
+
- type definition + default value:
"def_bool"/"def_tristate" <expr> ["if" <expr>]
This is a shorthand notation for a type definition plus a value.