linux-kernel - Re: [PATCH v4 0/6] bootconfig: Add mixed subkeys and value under the same key

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Message-ID: <CAOELnJzW4boH=WadqW31hbWLhmZgNLD9+EiN0GJGBe1RCMxFaw@mail.gmail.com>
Date:   Wed, 2 Jun 2021 16:02:27 -0700
From:   Devin Moore <devinmoore@...gle.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 0/6] bootconfig: Add mixed subkeys and value under the
 same key

On Wed, Jun 2, 2021 at 1:18 AM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> Hi,
>
> Here is the 4th version of the series which updates bootconfig to
> support mixed subkeys and a value under the same key.
> The 3rd version is completely wrong. I missed to picked up the older
> (v1) patches to v3. So please ignore v3.
>
> Since the kernel cmdline accepts options like
> "aaa.bbb=val1 aaa.bbb.ccc=val2", it is better that the bootconfig
> also support it.
>
> Here is the previous series (v2):
>   https://lore.kernel.org/lkml/162157886618.78209.11141970623539574861.stgit@devnote2/
>
> In this version, I rebased on top of the latest linus tree and
> add the build error fix [1/6](*) and a cleanup patch [6/6].
>
> (*) https://lore.kernel.org/lkml/162087519356.442660.11385099982318160180.stgit@devnote2/
>
> Changes in v4
>  [1/6]:
>      - Added from separated thread. This is a fundamental fix.
>  [6/6]:
>      - New cleanup patch.
>
>
> 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 (6):
>       tools/bootconfig: Fix a build error accroding to undefined fallthrough
>       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
>       bootconfig: Share the checksum function with tools
>
>
>  Documentation/admin-guide/bootconfig.rst           |   30 +++++++-
>  fs/proc/bootconfig.c                               |    2 -
>  include/linux/bootconfig.h                         |   58 ++++++++++++++-
>  init/main.c                                        |   12 ---
>  lib/bootconfig.c                                   |   76 +++++++++++++++-----
>  tools/bootconfig/include/linux/bootconfig.h        |    4 +
>  tools/bootconfig/main.c                            |   62 +++++++++++-----
>  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 +
>  16 files changed, 205 insertions(+), 71 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>


Thanks for the updated patches.
I tested the v4 changes on an Android virtual device(Cuttlefish) with
a variety of
parameters that included array values. I checked the output in /proc/bootconfig
before and after the changes.
I added a new parameter that failed before these changes and it worked great!
Added 'androidboot.hardware=cutf_cvm ' which worked with
'androidboot.hardware.gralloc = "minigbm"' that was already present.

These changes really help Android simplify some boot configuration
processes. We will be using it ASAP.

So,

Tested-by: Devin Moore <devinmoore@...gle.com>