linux-kernel - [PATCH v2 0/4] bootconfig: Add mixed subkeys and value under the same key

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Date:   Fri, 21 May 2021 15:34:26 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Devin Moore <devinmoore@...gle.com>
Subject: [PATCH v2 0/4] bootconfig: Add mixed subkeys and value under the same key

Hi,

Here is the 2nd version of the series which updates bootconfig to
support mixed subkeys and a value under the same key.
Since the kernel cmdline accepts options like 
"aaa.bbb=val1 aaa.bbb.ccc=val2", it is better that the bootconfig
also support it.

In this version, I fixed [1/4] to show /proc/bootconfig correctly
and update the description.

Changes in v2
 [1/4]:
      - Fix /proc/bootconfig accroding to Devin's report (Thanks!)
      - Update patch description to explain why, not what.
      - Use xbc_node_is_array() instead of checking field directly.
 [4/4]:
      - Update an exmaple code.


This series depends on the below bugfix.

 https://lore.kernel.org/lkml/162087519356.442660.11385099982318160180.stgit@devnote2/

With this series, sub-keys and a value can co-exist under a parent key.
For example, following config is allowed.

 foo = value1
 foo.bar = value2

Note, since there is no syntax to put a raw value directly under a
structured key, you have to define it outside of the brace. For example,

 foo {
     bar = value1
     bar {
         baz = value2
         qux = value3
     }
 }

Also, the order of the value node under a key is fixed. If there
are a value and subkeys, the value is always the first child node
of the key. Thus if user specifies subkeys first, e.g.

 foo.bar = value1
 foo = value2

In the program (and /proc/bootconfig), it will be shown as below

 foo = value2
 foo.bar = value1


Thank you,

---

Masami Hiramatsu (4):
      bootconfig: Change array value to use child node
      bootconfig: Support mixing a value and subkeys under a key
      tools/bootconfig: Support mixed value and subkey test cases
      docs: bootconfig: Update for mixing value and subkeys


 Documentation/admin-guide/bootconfig.rst           |   30 +++++++-
 fs/proc/bootconfig.c                               |    2 -
 include/linux/bootconfig.h                         |   38 +++++++++-
 lib/bootconfig.c                                   |   76 +++++++++++++++-----
 tools/bootconfig/main.c                            |   47 ++++++++++--
 tools/bootconfig/samples/bad-mixed-kv1.bconf       |    3 -
 tools/bootconfig/samples/bad-mixed-kv2.bconf       |    3 -
 tools/bootconfig/samples/bad-override.bconf        |    3 -
 tools/bootconfig/samples/bad-override2.bconf       |    3 -
 tools/bootconfig/samples/good-mixed-append.bconf   |    4 +
 tools/bootconfig/samples/good-mixed-kv1.bconf      |    3 +
 tools/bootconfig/samples/good-mixed-kv2.bconf      |    3 +
 tools/bootconfig/samples/good-mixed-kv3.bconf      |    6 ++
 tools/bootconfig/samples/good-mixed-override.bconf |    4 +
 14 files changed, 178 insertions(+), 47 deletions(-)
 delete mode 100644 tools/bootconfig/samples/bad-mixed-kv1.bconf
 delete mode 100644 tools/bootconfig/samples/bad-mixed-kv2.bconf
 delete mode 100644 tools/bootconfig/samples/bad-override.bconf
 delete mode 100644 tools/bootconfig/samples/bad-override2.bconf
 create mode 100644 tools/bootconfig/samples/good-mixed-append.bconf
 create mode 100644 tools/bootconfig/samples/good-mixed-kv1.bconf
 create mode 100644 tools/bootconfig/samples/good-mixed-kv2.bconf
 create mode 100644 tools/bootconfig/samples/good-mixed-kv3.bconf
 create mode 100644 tools/bootconfig/samples/good-mixed-override.bconf

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>