linux-kernel - [PATCH v6 0/8] scripts/make_fit: Support ramdisks and faster operations

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Message-ID: <20251119181333.991099-1-sjg@chromium.org>
Date: Wed, 19 Nov 2025 11:13:21 -0700
From: Simon Glass <sjg@...omium.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Tom Rini <trini@...sulko.com>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>,
	J . Neuschäfer <j.ne@...teo.net>,
	Nicolas Schier <nicolas@...sle.eu>,
	Chen-Yu Tsai <wenst@...omium.org>,
	Simon Glass <sjg@...omium.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Bill Wendling <morbo@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	David Sterba <dsterba@...e.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Justin Stitt <justinstitt@...gle.com>,
	Kees Cook <kees@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Nick Terrell <terrelln@...com>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Rong Xu <xur@...gle.com>,
	Tamir Duberstein <tamird@...il.com>,
	Will Deacon <will@...nel.org>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v6 0/8] scripts/make_fit: Support ramdisks and faster operations

This series updates 'make image.fit' to support adding a ramdisk to the
FIT, either one provided as a parameter or one created from all the
kernel modules.

It also includes a few performance improvement, so that building a FIT
from ~450MB of kernel/module/devicetree files only takes a few seconds
on a modern machine.

Note: I included support for using the existing cpio script as suggested
by Ahmad, but a fallback remains in case that is not available.

https://lore.kernel.org/lkml/CAFLszThpTg-FBoNG_tQ0xve0LkYWER85EJeHuem-_JUD8J1Ocw@mail.gmail.com/

Changes in v6:
- Using the modules.order file instead of 'find'
- Use gen_initramfs.sh where available
- Mention that FIT_MODULES just needs to be non-empty
- Make use of modules.order instead of using 'find'

Changes in v5:
- Fix 'use' typo
- Add a new patch to split out module targets into a variable
- Build modules automatically if needed (fix from Nicolas Schier)

Changes in v4:
- Update the commit message
- Provide the list of modules from the Makefile
- Reduce verbosity (don't print every module filename)
- Rename the Makefile variable from 'EXTRA' to 'MAKE_FIT_FLAGS'
- Use an empty FIT_MODULES to disable the feature, instead of '0'
- Make use of the 'modules' dependency to ensure modules are built
- Pass the list of modules to the script

Changes in v3:
- Move the ramdisk chunk into the correct patch
- Add a comment at the top of the file about the -r option
- Count the ramdisk in the total files
- Update the commit message
- Add a way to add built modules into the FIT

Changes in v2:
- Don't compress the ramdisk as it is already compressed

Simon Glass (8):
  scripts/make_fit: Speed up operation
  scripts/make_fit: Support an initial ramdisk
  scripts/make_fit: Move dtb processing into a function
  scripts/make_fit: Provide a way to add built modules
  kbuild: Split out module targets into a variable
  kbuild: Allow adding modules into the FIT ramdisk
  scripts/make_fit: Support a few more parallel compressors
  scripts/make_fit: Compress dtbs in parallel

 Makefile             |   8 +-
 arch/arm64/Makefile  |   1 +
 scripts/Makefile.lib |   6 +-
 scripts/make_fit.py  | 293 +++++++++++++++++++++++++++++++++++++------
 4 files changed, 269 insertions(+), 39 deletions(-)

-- 
2.43.0

base-commit: 4a71531471926e3c391665ee9c42f4e0295a4585
branch: fita6