linux

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-22 07:53:11 -05:00

No description

Find a file

Masahiro Yamada 7fb1d1e038 kbuild: move non-boot built-in DTBs to .rodata section Commit `aab94339cd` ("of: Add support for linking device tree blobs into vmlinux") introduced a mechanism to embed DTBs into vmlinux. Initially, it was used for wrapping boot DTBs in arch/*/boot/dts/, but it is now reused for more generic purposes, such as testing. Built-in DTBs are discarded because KERNEL_DTB() is part of INIT_DATA, as defined in include/asm-generic/vmlinux.lds.h. This has not been an issue so far because OF unittests are triggered during boot, as defined by late_initcall(of_unittest). However, the recent clk KUnit test additions have caused problems because KUnit can execute test suites after boot. For example: # echo > /sys/kernel/debug/kunit/clk_register_clk_parent_data_device/run This command triggers a stack trace because built-in DTBs have already been freed. While it is possible to move such test suites from kunit_test_suites to kunit_test_init_section_suites, it would be preferable to avoid usage limitations. This commit moves non-boot built-in DTBs to the .rodata section. Since these generic DTBs are looked up by name, they do not need to be placed in the special .dtb.init.rodata section. Boot DTBs should remain in .dtb.init.rodata because the arch boot code generally does not know the DT name, thus it uses the __dtb_start symbol to locate it. This separation also ensures that the __dtb_start symbol references the boot DTB. Currently, the .dtb.init.rodata is a mixture of both boot and non-boot DTBs. The __dtb_start symbol must be followed by the boot DTB, but we currently rely on the link order (i.e., the order in Makefiles), which is very fragile. The implementation is kind of cheesy; the section is .dtb.init.rodata when $(obj) starts with arch/$(SRCARCH)/boot/dts, and .rodata section otherwise. This will be refactored later. Fixes: `5c9dd72d83` ("of: Add a KUnit test for overlays and test managed APIs") Fixes: `5776526beb` ("clk: Add KUnit tests for clk fixed rate basic type") Fixes: `274aff8711` ("clk: Add KUnit tests for clks registered with struct clk_parent_data") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Rob Herring (Arm) <robh@kernel.org>		2024-09-30 20:42:52 +09:00
arch	x86: kvm: fix build error	2024-09-29 14:47:33 -07:00
block
certs
crypto
Documentation
drivers
fs
include
init
io_uring
ipc
kernel
lib
LICENSES
mm
net
rust
samples
scripts	kbuild: move non-boot built-in DTBs to .rodata section	2024-09-30 20:42:52 +09:00
security
sound
tools
usr
virt
.clang-format
.cocciconfig
.editorconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile	Linux 6.12-rc1	2024-09-29 15:06:19 -07:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.