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authorMasami Hiramatsu <mhiramat@kernel.org>2020-07-16 01:00:47 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-08-03 16:22:29 -0400
commitc58b46cba71750c6e969625abb1cf3ddabb15e06 (patch)
tree83b5d0c4043a0f94123a6bc7d860b0326502e996 /Documentation/admin-guide
parent81464192839de0b5bc84c5739381101e04d94f62 (diff)
Documentation: bootconfig: Add bootconfig override operator
Add a sentence about bootconfig override operator (":=") to bootconfig.rst. Link: https://lkml.kernel.org/r/159482884682.126704.7198860675721719878.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/bootconfig.rst11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/admin-guide/bootconfig.rst b/Documentation/admin-guide/bootconfig.rst
index d6b3b77a4129..a22024f9175e 100644
--- a/Documentation/admin-guide/bootconfig.rst
+++ b/Documentation/admin-guide/bootconfig.rst
@@ -71,6 +71,16 @@ For example,::
foo = bar, baz
foo = qux # !ERROR! we can not re-define same key
+If you want to update the value, you must use the override operator
+``:=`` explicitly. For example::
+
+ foo = bar, baz
+ foo := qux
+
+then, the ``qux`` is assigned to ``foo`` key. This is useful for
+overriding the default value by adding (partial) custom bootconfigs
+without parsing the default bootconfig.
+
If you want to append the value to existing key as an array member,
you can use ``+=`` operator. For example::
@@ -84,6 +94,7 @@ For example, following config is NOT allowed.::
foo = value1
foo.bar = value2 # !ERROR! subkey "bar" and value "value1" can NOT co-exist
+ foo.bar := value2 # !ERROR! even with the override operator, this is NOT allowed.
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