[v3,0/7] of: populate of_root node if bootloader doesn't

Message

Stephen Boyd Feb. 2, 2024, 7:59 p.m. UTC

Arch maintainers, please ack/review patches.

This is a resend of a series from Frank last year[1]. I worked in Rob's
review comments to unconditionally call unflatten_device_tree() and
fixup/audit calls to of_have_populated_dt() so that behavior doesn't
change.

I need this series so I can add DT based tests in the clk framework.
Either I can merge it through the clk tree once everyone is happy, or
Rob can merge it through the DT tree and provide some branch so I can
base clk patches on it.

Changes from Frank's series[1]:
 * Add a DTB loaded kunit test
 * Make of_have_populated_dt() return false if the DTB isn't from the
   bootloader
 * Architecture calls made unconditional so that a root node is always
   made

Changes from v2 (https://lore.kernel.org/r/[e-mail]):
 * Reorder patches to have OF changes largely first
 * No longer modify initial_boot_params if ACPI=y
 * Put arm64 patch back to v1

Changes from v1 (https://lore.kernel.org/r/[e-mail]):
 * x86 patch included
 * arm64 knocks out initial dtb if acpi is in use
 * keep Kconfig hidden but def_bool enabled otherwise

Frank Rowand (2):
  of: Create of_root if no dtb provided by firmware
  of: unittest: treat missing of_root as error instead of fixing up

Stephen Boyd (5):
  of: Always unflatten in unflatten_and_copy_device_tree()
  um: Unconditionally call unflatten_device_tree()
  x86/of: Unconditionally call unflatten_and_copy_device_tree()
  arm64: Unconditionally call unflatten_device_tree()
  of: Add KUnit test to confirm DTB is loaded

 arch/arm64/kernel/setup.c    |  3 +-
 arch/um/kernel/dtb.c         | 14 ++++----
 arch/x86/kernel/devicetree.c | 24 +++++++-------
 drivers/of/.kunitconfig      |  3 ++
 drivers/of/Kconfig           | 11 ++++++-
 drivers/of/Makefile          |  4 ++-
 drivers/of/empty_root.dts    |  6 ++++
 drivers/of/fdt.c             | 64 +++++++++++++++++++++++++++---------
 drivers/of/of_test.c         | 48 +++++++++++++++++++++++++++
 drivers/of/platform.c        |  3 --
 drivers/of/unittest.c        | 16 +++------
 include/linux/of.h           | 25 ++++++++------
 12 files changed, 158 insertions(+), 63 deletions(-)
 create mode 100644 drivers/of/.kunitconfig
 create mode 100644 drivers/of/empty_root.dts
 create mode 100644 drivers/of/of_test.c

Cc: Anton Ivanov <[e-mail]>
Cc: Brendan Higgins <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: David Gow <[e-mail]>
Cc: Frank Rowand <[e-mail]>
Cc: Johannes Berg <[e-mail]>
Cc: Richard Weinberger <[e-mail]>
Cc: Rob Herring <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: Saurabh Sengar <[e-mail]>

[1] https://lore.kernel.org/r/[e-mail]

base-commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a