[GIT PULL] bootconfig: Updates for v7.3

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

Hi Linus,

Sorry for sending this pull request last minutes. This branch missed the last
merge window and had been sitting in the for-next branch; I nearly forgot about it.

Bootconfig updates for v7.3:

- bootconfig: Support build-time command line rendering for embedded bootconfig
  . bootconfig: render descendant keys when xbc_snprint_cmdline() root has a
    value. Fix xbc_snprint_cmdline() to render descendant keys when the root
    has both a value and subkeys, and treats empty subtrees correctly.
  . bootconfig: render embedded bootconfig as a kernel cmdline at build time.
    Add build-time pipeline using tools/bootconfig -C to render the embedded
    bootconfig "kernel" subtree into .init.rodata as a cmdline string.
  . bootconfig: clean build-time tools/bootconfig from make clean.
  . bootconfig: add xbc_prepend_embedded_cmdline() helper.
    Add helper to prepend embedded bootconfig cmdline into boot_command_line
    early before parse_early_param().
  . x86/setup: prepend embedded bootconfig cmdline before parse_early_param.
    Wire early prepend helper in x86 setup_arch() so early_param handlers see
    values from the embedded bootconfig. (So this feature is currently x86 only)
  . bootconfig: skip runtime kernel.* render once prepended early.
    Avoid duplicating "kernel" keys in setup_boot_config().
  . init/main.c: use bootconfig_cmdline_requested() for the runtime opt-in.
    Refactor setup_boot_config() to share bootconfig_cmdline_requested().
  . Documentation: bootconfig: document build-time cmdline rendering.
    Document CONFIG_CMDLINE_FROM_BOOTCONFIG usage, requirements, and precedence.


Please pull the latest bootconfig-v7.3 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
bootconfig-v7.3

Tag SHA1: b0039fb68cbb6070f5f017a166426f100d42c63a
Head SHA1: 85595d3f964825c833fd2597521fcef67c3071de


Breno Leitao (8):
      bootconfig: render descendant keys when xbc_snprint_cmdline() root has a value
      bootconfig: render embedded bootconfig as a kernel cmdline at build time
      bootconfig: clean build-time tools/bootconfig from make clean
      bootconfig: add xbc_prepend_embedded_cmdline() helper
      Documentation: bootconfig: document build-time cmdline rendering
      x86/setup: prepend embedded bootconfig cmdline before parse_early_param
      bootconfig: skip runtime kernel.* render once prepended early
      init/main.c: use bootconfig_cmdline_requested() for the runtime opt-in

----
 Documentation/admin-guide/bootconfig.rst |  81 ++++++++++++++++++
 MAINTAINERS                              |   1 +
 Makefile                                 |  27 +++++-
 arch/x86/Kconfig                         |   1 +
 arch/x86/kernel/setup.c                  |  14 +++-
 include/linux/bootconfig.h               |  14 ++++
 init/Kconfig                             |  36 ++++++++
 init/main.c                              |  52 ++++++------
 lib/Makefile                             |  16 ++++
 lib/bootconfig.c                         | 139 ++++++++++++++++++++++++++++++-
 lib/embedded-cmdline.S                   |  16 ++++
 tools/bootconfig/Makefile                |   4 +-
 12 files changed, 372 insertions(+), 29 deletions(-)
 create mode 100644 lib/embedded-cmdline.S

-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>