Messages in this thread Patch in this message | | | Date | Tue, 04 Aug 2020 16:58:00 -0400 | From | Steven Rostedt <> | Subject | [for-linus][PATCH 17/17] Documentation: bootconfig: Add bootconfig override operator |
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From: Masami Hiramatsu <mhiramat@kernel.org>
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> --- Documentation/admin-guide/bootconfig.rst | 11 +++++++++++ 1 file changed, 11 insertions(+)
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. Comments -- 2.26.2
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