Documentation: bootconfig: Add bootconfig override operator (c58b46cb) · Commits · 戴 / test

Add a sentence about bootconfig override operator (":=") to bootconfig.rst. Link: https://lkml.kernel.org/r/159482884682.126704.7198860675721719878.stgit@devnote2 Signed-off-by:

Documentation/admin-guide/bootconfig.rst

+11 −0

Original line number	Diff line number	Diff line
		@@ -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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