Commit Graph

9782 Commits

Author SHA1 Message Date
Jonathan Corbet
a9e732c12d docs: add a scripts/kernel-doc symbolic link
Some folks evidently have muscle memory expecting kernel-doc to be under
scripts/.  Now that we have moved it to tools/docs, leave behind a symbolic
link to reduce the global profanity count.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2026-01-20 15:57:06 -07:00
Jonathan Corbet
eba6ffd126 docs: kdoc: move kernel-doc to tools/docs
kernel-doc is the last documentation-related tool still living outside of
the tools/docs directory; the time has come to move it over.

[mchehab: fixed kdoc lib location]

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <311d17e403524349940a8b12de6b5e91e554b1f4.1768823489.git.mchehab+huawei@kernel.org>
2026-01-20 15:31:06 -07:00
Mauro Carvalho Chehab
6cc45ee5df docs: kdoc: some fixes to kernel-doc comments
There are some typos and English errors in the comments of kernel‑doc.py.

Locate them with the help of an LLM (gpt‑oss 14B), executed locally
with this prompt:

        review English grammar and syntax at the comments on the code below:
        <cat scripts/kernel-doc.py>

While LLM worked fine for the task of doing an English grammar review
for strings, being able to distinguish them from the actual code, it
was not is perfect: some things required manual work to fix.

-

While here, replace:

    "/**" with: ``/**``

As, if we ever rename this script to kernel_doc.py and add it to
Sphinx ext autodoc, we want to avoid this warning:

    scripts/kernel_doc.py:docstring of kernel_doc:10: WARNING: Inline strong start-string without end-string. [docutils]

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <ec08727f22ad35e6c58519c1f425f216f14b701c.1768823489.git.mchehab+huawei@kernel.org>
2026-01-20 15:31:06 -07:00
Mauro Carvalho Chehab
bd28e99720 docs: kdoc: ensure that comments are using our coding style
Along kernel-doc libs, we opted to have all comments starting/ending
with a blank comment line. Use the same style here.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <50e430acd333a500719205e80ab3b2d297edcd7d.1768823489.git.mchehab+huawei@kernel.org>
2026-01-20 15:31:06 -07:00
Mauro Carvalho Chehab
802774d853 docs: kdoc: avoid error_count overflows
The glibc library limits the return code to 8 bits. We need to
stick to this limit when using sys.exit(error_count).

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <233d1674db99ed8feb405a2f781de350f0fba0ac.1768823489.git.mchehab+huawei@kernel.org>
2026-01-20 15:31:05 -07:00
Tamir Duberstein
6c37b6841a rust: kunit: replace kernel::c_str! with C-Strings
C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Reviewed-by: David Gow <davidgow@google.com>
Link: https://patch.msgid.link/20251222-cstr-kunit-v1-1-39d999672f35@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-19 01:13:23 +01:00
Tamir Duberstein
ac3c50b9a2 scripts: generate_rust_analyzer: compile sysroot with correct edition
Use `core_edition` for all sysroot crates rather than just core as all
were updated to edition 2024 in Rust 1.87.

Fixes: f4daa80d6b ("rust: compile libcore with edition 2024 for 1.87+")
Signed-off-by: Tamir Duberstein <tamird@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260116-rust-analyzer-sysroot-v2-1-094aedc33208@kernel.org
[ Added `>`s to make the quote a single block. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:26:29 +01:00
Tamir Duberstein
bc83834c15 scripts: generate_rust_analyzer: compile quote with correct edition
Our copy of the quote crate uses edition 2018, thus generate the correct
rust-analyzer configuration for it.

Fixes: 88de91cc1c ("rust: quote: enable support in kbuild")
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Reviewed-by: Jesung Yang <y.j3ms.n@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260115-rust-analyzer-quote-edition-v1-1-d492f880dde4@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:26:29 +01:00
Jesung Yang
3a50257e56 scripts: generate_rust_analyzer: quote: treat core and std as dependencies
Fix the `generate_rust_analyzer.py` script to ensure that the
`rust-project.json` it produces includes `core` and `std` in the `deps`
field for the `quote` crate.

`quote` directly references items from both `core` and `std`, so
rust-analyzer should treat them as dependencies to provide correct IDE
support.

For example, the `::quote::ToTokens` trait is implemented for
`std::ffi::CString`. With `std` listed in the `deps` field,
rust-analyzer can show the expected autocomplete for the
`::quote::ToTokens` methods on `std::ffi::CString`.

Verified the explicit uses of `core` and `std` using:

    grep -rnE 'core::|std::' rust/quote/

Fixes: 88de91cc1c ("rust: quote: enable support in kbuild")
Signed-off-by: Jesung Yang <y.j3ms.n@gmail.com>
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/cef76fc1105481d219953c8552eb5eb07dac707a.1764062688.git.y.j3ms.n@gmail.com
[ Reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:26:26 +01:00
Jesung Yang
87417cc95b scripts: generate_rust_analyzer: syn: treat std as a dependency
Fix the `generate_rust_analyzer.py` script to ensure that the
`rust-project.json` it produces includes `std` in the `deps` field for
the `syn` crate.

`syn` directly references items from `std`, so rust-analyzer should
treat it as a dependency to provide correct IDE support.

For example, `syn::Punctuated` contains fields of type `Vec<..>` and
`Option<..>`, both of which come from the standard library prelude.
With `std` listed in the `deps` field, rust-analyzer can infer the types
of these fields instead of showing `{unknown}`.

Verified the explicit uses of `std` using:

    grep -rn 'std::' rust/syn/

Fixes: 737401751a ("rust: syn: enable support in kbuild")
Signed-off-by: Jesung Yang <y.j3ms.n@gmail.com>
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Tested-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/6dbdf6e1c1639ae381ca9ab7041f84728ffa2267.1764062688.git.y.j3ms.n@gmail.com
[ Reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:25:26 +01:00
Onur Özkan
1b83ef9f7a scripts: generate_rust_analyzer: remove sysroot assertion
With nixpkgs's rustc, rust-src component is not bundled
with the compiler by default and is instead provided from
a separate store path, so this assumption does not hold.

The assertion assumes these paths are in the same location
which causes `make LLVM=1 rust-analyzer` to fail on NixOS.

Link: https://rust-for-linux.zulipchat.com/#narrow/stream/x/topic/x/near/565284250
Signed-off-by: Onur Özkan <work@onurozkan.dev>
Reviewed-by: Gary Guo <gary@garyguo.net>
Fixes: fe99216357 ("rust: Support latest version of `rust-analyzer`")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20251224135343.32476-1-work@onurozkan.dev
[ Reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:24:15 +01:00
Miguel Ojeda
af20ae33e7 rust: kbuild: give --config-path to rustfmt in .rsi target
`rustfmt` is configured via the `.rustfmt.toml` file in the source tree,
and we apply `rustfmt` to the macro expanded sources generated by the
`.rsi` target.

However, under an `O=` pointing to an external folder (i.e. not just
a subdir), `rustfmt` will not find the file when checking the parent
folders. Since the edition is configured in this file, this can lead to
errors when it encounters newer syntax, e.g.

    error: expected one of `!`, `.`, `::`, `;`, `?`, `where`, `{`, or an operator, found `"rust_minimal"`
      --> samples/rust/rust_minimal.rsi:29:49
       |
    28 | impl ::kernel::ModuleMetadata for RustMinimal {
       |                                               - while parsing this item list starting here
    29 |     const NAME: &'static ::kernel::str::CStr = c"rust_minimal";
       |                                                 ^^^^^^^^^^^^^^ expected one of 8 possible tokens
    30 | }
       | - the item list ends here
       |
       = note: you may be trying to write a c-string literal
       = note: c-string literals require Rust 2021 or later
       = help: pass `--edition 2024` to `rustc`
       = note: for more on editions, read https://doc.rust-lang.org/edition-guide

A workaround is to use `RUSTFMT=n`, which is documented in the `Makefile`
help for cases where macro expanded source may happen to break `rustfmt`
for other reasons, but this is not one of those cases.

One solution would be to pass `--edition`, but we want `rustfmt` to
use the entire configuration, even if currently we essentially use the
default configuration.

Thus explicitly give the path to the config file to `rustfmt` instead.

Reported-by: Alice Ryhl <aliceryhl@google.com>
Fixes: 2f7ab1267d ("Kbuild: add Rust support")
Cc: stable@vger.kernel.org
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260115183832.46595-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-18 20:24:15 +01:00
Peter Zijlstra
fd69b2f7d5 compiler: Use __typeof_unqual__() for __unqual_scalar_typeof()
The recent changes to get_unaligned() resulted in a new sparse warning:

   net/rds/ib_cm.c:96:35: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected void * @@     got restricted __be64 const * @@
   net/rds/ib_cm.c:96:35: sparse:     expected void *
   net/rds/ib_cm.c:96:35: sparse:     got restricted __be64 const *

The updated get_unaligned_t() uses __unqual_scalar_typeof() to get an
unqualified type. This works correctly for the compilers, but fails for
sparse when the data type is __be64 (or any other __beNN variant).

On sparse runs (C=[12]) __beNN types are annotated with
__attribute__((bitwise)).

That annotation allows sparse to detect incompatible operations on __beNN
variables, but it also prevents sparse from evaluating the _Generic() in
__unqual_scalar_typeof() and map __beNN to a unqualified scalar type, so it
ends up with the default, i.e. the original qualified type of a 'const
__beNN' pointer. That then ends up as the first pointer argument to
builtin_memcpy(), which obviously causes the above sparse warnings.

The sparse git tree supports typeof_unqual() now, which allows to use it
instead of the _Generic() based __unqual_scalar_typeof(). With that sparse
correctly evaluates the unqualified type and keeps the __beNN logic intact.

The downside is that this requires a top of tree sparse build and an old
sparse version will emit a metric ton of incomprehensible error messages
before it dies with a segfault.

Therefore implement a sanity check which validates that the checker is
available and capable of handling typeof_unqual(). Emit a warning if not so
the user can take informed action.

[ tglx: Move the evaluation of USE_TYPEOF_UNQUAL to compiler_types.h so it is
  	set before use and implement the sanity checker ]

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://patch.msgid.link/87ecnp2zh3.ffs@tglx
Closes: https://lore.kernel.org/oe-kbuild-all/202601150001.sKSN644a-lkp@intel.com/
2026-01-18 10:32:03 +01:00
Benno Lossin
514e4ed2c9 rust: pin-init: add syn dependency and remove proc-macro[2] and quote workarounds
`syn` makes parsing Rust from proc-macros a lot simpler. `pin-init` has
not used `syn` up until now, because the we did not support it. That
changed in commit 54e3eae855 ("Merge patch series "`syn` support""),
so we can finally utilize the added ergonomics of parsing proc-macro
input with `syn`.

Previously we only had the `proc-macro` library available, whereas the
user-space version also used `proc-macro2` and `quote`. Now both are
available, so remove the workarounds.

Due to these changes, clippy emits warnings about unnecessary
`.to_string()` as `proc-macro2` provides an additional `PartialEq` impl
on `Ident`, so the warnings are fixed.

[ Adjusted wording from upstream version and added build system changes
  for the kernel - Benno ]

Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Signed-off-by: Benno Lossin <lossin@kernel.org>
2026-01-17 10:49:31 +01:00
Alexei Starovoitov
e3d0dbb3b5 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf after rc5
Cross-merge BPF and other fixes after downstream PR.

No conflicts.

Adjacent:
Auto-merging MAINTAINERS
Auto-merging Makefile
Auto-merging kernel/bpf/verifier.c
Auto-merging kernel/sched/ext.c
Auto-merging mm/memcontrol.c

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-01-14 15:22:01 -08:00
Kees Cook
070580b0b1 checkpatch: Suggest kmalloc_obj family for sizeof allocations
To support shifting away from sized allocation towards typed
allocations, suggest the kmalloc_obj family of macros when a sizeof() is
present in the argument lists.

Link: https://patch.msgid.link/20251203233036.3212363-2-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
2026-01-14 14:43:01 -08:00
Thomas Weißschuh
379b749add kbuild: Drop superfluous compiler option checks
Many of the compiler option checks are not necessary anymore with the
current supported versions of compilers (clang 15+, GCC 8.1+).

Remove them.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260113-kbuild-cc-option-v1-1-011314a0f7f1@weissschuh.net
[nathan: Add minor note about currently supported compilers]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2026-01-14 14:22:33 -07:00
Tamir Duberstein
74e15ac34b scripts: generate_rust_analyzer: Add pin_init_internal deps
Commit d7659acca7 ("rust: add pin-init crate build infrastructure")
did not add dependencies to `pin_init_internal`, resulting in broken
navigation. Thus add them now.

[ Tamir elaborates:

  "before this series, go-to-symbol from pin_init_internal to e.g.
   proc_macro::TokenStream doesn't work."

     - Miguel ]

Signed-off-by: Tamir Duberstein <tamird@kernel.org>
Reviewed-by: Jesung Yang <y.j3ms.n@gmail.com>
Acked-by: Benno Lossin <lossin@kernel.org>
Fixes: d7659acca7 ("rust: add pin-init crate build infrastructure")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250723-rust-analyzer-pin-init-v1-3-3c6956173c78@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-14 19:53:02 +01:00
Tamir Duberstein
98dcca8553 scripts: generate_rust_analyzer: Add pin_init -> compiler_builtins dep
Add a dependency edge from `pin_init` to `compiler_builtins` to
`scripts/generate_rust_analyzer.py` to match `rust/Makefile`. This has
been incorrect since commit d7659acca7 ("rust: add pin-init crate
build infrastructure").

Signed-off-by: Tamir Duberstein <tamird@kernel.org>
Reviewed-by: Jesung Yang <y.j3ms.n@gmail.com>
Acked-by: Benno Lossin <lossin@kernel.org>
Fixes: d7659acca7 ("rust: add pin-init crate build infrastructure")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250723-rust-analyzer-pin-init-v1-2-3c6956173c78@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-14 19:53:02 +01:00
Tamir Duberstein
5157c328ed scripts: generate_rust_analyzer: Add compiler_builtins -> core dep
Add a dependency edge from `compiler_builtins` to `core` to
`scripts/generate_rust_analyzer.py` to match `rust/Makefile`. This has
been incorrect since commit 8c4555ccc5 ("scripts: add
`generate_rust_analyzer.py`")

Signed-off-by: Tamir Duberstein <tamird@kernel.org>
Reviewed-by: Jesung Yang <y.j3ms.n@gmail.com>
Acked-by: Benno Lossin <lossin@kernel.org>
Fixes: 8c4555ccc5 ("scripts: add `generate_rust_analyzer.py`")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250723-rust-analyzer-pin-init-v1-1-3c6956173c78@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-14 19:53:02 +01:00
Arkadiusz Kozdra
baaecfcac5 kconfig: fix static linking of nconf
When running make nconfig with a static linking host toolchain,
the libraries are linked in an incorrect order,
resulting in errors similar to the following:

$ MAKEFLAGS='HOSTCC=cc\ -static' make nconfig
/usr/bin/ld: /usr/lib64/gcc/x86_64-unknown-linux-gnu/14.2.1/../../../../lib64/libpanel.a(p_new.o): in function `new_panel':
(.text+0x13): undefined reference to `_nc_panelhook_sp'
/usr/bin/ld: (.text+0x6c): undefined reference to `_nc_panelhook_sp'

Fixes: 1c5af5cf93 ("kconfig: refactor ncurses package checks for building mconf and nconf")
Signed-off-by: Arusekk <floss@arusekk.pl>
Link: https://patch.msgid.link/20260110114808.22595-1-floss@arusekk.pl
[nsc: Added comment about library order]
Signed-off-by: Nicolas Schier <nsc@kernel.org>
2026-01-14 14:23:20 +01:00
Carlos Llamas
946d462346 kbuild: prefer ${NM} in check-function-names.sh
The check-function-names.sh scripts invokes 'nm' directly and this can
be problematic during cross-compilation when the toolchain is different
from the system's default (e.g. LLVM=1).

  scripts/check-function-names.sh: nm: not found

Let's prefer the ${NM} variable which is already set by kbuild. However,
still fallback to plain 'nm' to ensure the script is still usable when
called directly.

Fixes: 93863f3f85 ("kbuild: Check for functions with ambiguous -ffunction-sections section names")
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20251218175824.3122690-1-cmllamas@google.com
Signed-off-by: Nicolas Schier <nsc@kernel.org>
2026-01-14 14:13:41 +01:00
Eric Biggers
7246fe6cd6 lib/crypto: tests: Add KUnit tests for NH
Add some simple KUnit tests for the nh() function.

These replace the test coverage which will be lost by removing the
nhpoly1305 crypto_shash.

Note that the NH code also continues to be tested indirectly as well,
via the tests for the "adiantum(xchacha12,aes)" crypto_skcipher.

Link: https://lore.kernel.org/r/20251211011846.8179-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
2026-01-12 11:07:49 -08:00
Linus Torvalds
7143203341 Merge tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux
Pull crypto library fixes from Eric Biggers:

 - A couple more fixes for the lib/crypto KUnit tests

 - Fix missing MMU protection for the AES S-box

* tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  lib/crypto: aes: Fix missing MMU protection for AES S-box
  MAINTAINERS: add test vector generation scripts to "CRYPTO LIBRARY"
  lib/crypto: tests: Fix syntax error for old python versions
  lib/crypto: tests: polyval_kunit: Increase iterations for preparekey in IRQs
2026-01-11 15:07:56 -10:00
Thomas Gleixner
2e4b28c48f treewide: Update email address
In a vain attempt to consolidate the email zoo switch everything to the
kernel.org account.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-01-11 06:09:11 -10:00
Alice Ryhl
abf2111d8d rust: helpers: Move #define __rust_helper out of atomic.c
In order to support inline helpers [1], we need to have __rust_helper
defined for all helper files. Current we are lucky that atomic.c is the
first file in helpers.c, but this is fragile. Thus, move it to
helpers.c.

[boqun: Reword the commit message and apply file hash changes]

Link: https://lore.kernel.org/r/20260105-define-rust-helper-v2-0-51da5f454a67@google.com [1]
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20260107-move-rust_helper-define-v1-1-4109d58ef275@google.com
2026-01-09 19:01:42 +08:00
Jie Zhan
0f42c2a52d lib/crypto: tests: Fix syntax error for old python versions
'make binrpm-pkg' throws me this error, with Python 3.9:

*** Error compiling '.../gen-hash-testvecs.py'...
  File ".../scripts/crypto/gen-hash-testvecs.py", line 121
    return f'{alg.upper().replace('-', '_')}_DIGEST_SIZE'
                                   ^
SyntaxError: f-string: unmatched '('

Old python versions, presumably <= 3.11, can't resolve these quotes.

Fix it with double quotes for compatibility.

Fixes: 15c64c47e4 ("lib/crypto: tests: Add SHA3 kunit tests")
Signed-off-by: Jie Zhan <zhanjie9@hisilicon.com>
Link: https://lore.kernel.org/r/20260107015829.2000699-1-zhanjie9@hisilicon.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
2026-01-08 11:14:59 -08:00
Nathan Chancellor
2421649778 scripts/gen-btf.sh: Ensure initial object in gen_btf_o is ELF with correct endianness
After commit 600605853f ("scripts/gen-btf.sh: Fix .btf.o generation
when compiling for RISCV"), there is an error from llvm-objcopy when
CONFIG_LTO_CLANG is enabled:

  llvm-objcopy: error: '.tmp_vmlinux1.btf.o': The file was not recognized as a valid object file
  Failed to generate BTF for vmlinux

KBUILD_CFLAGS includes CC_FLAGS_LTO, which makes clang emit an LLVM IR
object, rather than an ELF one as expected by llvm-objcopy.

Most areas of the kernel deal with this by filtering out CC_FLAGS_LTO
from KBUILD_CFLAGS for the particular object or directory but this is
not so easy to do in bash. Just include '-fno-lto' after KBUILD_CFLAGS
to ensure an ELF object is consistently created as the initial .o file.

Additionally, while there is no reported or discovered bug yet, the
absence of KBUILD_CPPFLAGS from this command could result in incorrect
endianness because KBUILD_CPPFLAGS typically contains '-mbig-endian' and
'-mlittle-endian' so that biendian toolchains can be used. Include it in
this ${CC} command to hopefully limit necessary changes to this command
for the foreseeable future.

Fixes: 600605853f ("scripts/gen-btf.sh: Fix .btf.o generation when compiling for RISCV")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260106-fix-gen-btf-sh-lto-v2-1-01d3e1c241c4@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-01-06 21:00:38 -08:00
Nicolas Pitre
76df6815da kconfig: Support conditional deps using "depends on X if Y"
Extend the "depends on" syntax to support conditional dependencies
using "depends on X if Y". While functionally equivalent to "depends
on X || (Y == n)", "depends on X if Y" is much more readable and
makes the kconfig language uniform in supporting the "if <expr>"
suffix.
This also improves readability for "optional" dependencies, which
are the subset of conditional dependencies where X is Y.
Previously such optional dependencies had to be expressed as
the counterintuitive "depends on X || !X", now this can be
represented as "depends on X if X".

The change is implemented by converting the "X if Y" syntax into the
"X || (Y == n)" syntax during "depends on" token processing.

Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
[Graham Roff: Rewrote commit message, updated patch, added tests]
Signed-off-by: Graham Roff <grahamr@qti.qualcomm.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251215-kconfig_conditional_deps-v3-1-59519af0a5df@qti.qualcomm.com
[nathan: Minor adjustments to spacing]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2026-01-06 14:57:15 -07:00
oldzhu
0e2036a06d scripts/atomic: Fix kerneldoc spelling in try_cmpxchg()
Fix a typo in the kerneldoc comment template.

This changes 'occured' to 'occurred' in generated documentation.

Signed-off-by: oldzhu <oldrunner999@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260106040158.31461-1-oldrunner999@gmail.com
2026-01-06 16:34:28 +01:00
Vincent Mailhol
660e899103 kbuild: remove gcc's -Wtype-limits
W=2 builds are heavily polluted by the -Wtype-limits warning.

Here are some W=12 statistics on Linux v6.19-rc1 for an x86_64
defconfig (with just CONFIG_WERROR set to "n") using gcc 14.3.1:

	 Warning name			count	percent
	-------------------------------------------------
	 -Wlogical-op			    2	  0.00 %
	 -Wmaybe-uninitialized		  138	  0.20 %
	 -Wunused-macros		  869	  1.24 %
	 -Wmissing-field-initializers	 1418	  2.02 %
	 -Wshadow			 2234	  3.19 %
	 -Wtype-limits			65378	 93.35 %
	-------------------------------------------------
	 Total				70039	100.00 %

As we can see, -Wtype-limits represents the vast majority of all
warnings. The reason behind this is that these warnings appear in
some common header files, meaning that some unique warnings are
repeated tens of thousands of times (once per header inclusion).

Add to this the fact that each warning is coupled with a dozen lines
detailing some macro expansion. The end result is that the W=2 output
is just too bloated and painful to use.

Three years ago, I proposed in [1] modifying one such header to
silence that noise. Because the code was not faulty, Linus rejected
the idea and instead suggested simply removing that warning.

At that time, I could not bring myself to send such a patch because,
despite its problems, -Wtype-limits would still catch the below bug:

	unsigned int ret;

	ret = check();
	if (ret < 0)
		error();

Meanwhile, based on another suggestion from Linus, I added a new check
to sparse [2] that would catch the above bug without the useless spam.

With this, remove gcc's -Wtype-limits. People who still want to catch
incorrect comparisons between unsigned integers and zero can now use
sparse instead.

On a side note, clang also has a -Wtype-limits warning but:

  * it is not enabled in the kernel at the moment because, contrary to
    gcc, clang did not include it under -Wextra.

  * it does not warn if the code results from a macro expansion. So,
    if activated, it would not cause as much spam as gcc does.

  * -Wtype-limits is split into four sub-warnings [3] meaning that if
    it were to be activated, we could select which one to keep.

So there is no present need to explicitly disable -Wtype-limits in
clang.

[1] linux/bits.h: GENMASK_INPUT_CHECK: reduce W=2 noise by 31% treewide
Link: https://lore.kernel.org/all/20220308141201.2343757-1-mailhol.vincent@wanadoo.fr/

[2] Warn about "unsigned value that used to be signed against zero"
Link: https://lore.kernel.org/all/20250921061337.3047616-1-mailhol@kernel.org/

[3] clang's -Wtype-limits
Link: https://clang.llvm.org/docs/DiagnosticsReference.html#wtype-limits

Reviewed-by: Nicolas Schier <nsc@kernel.org>
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20251220-remove_wtype-limits-v3-1-24b170af700e@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2026-01-05 16:54:14 -07:00
Peter Zijlstra
c10d860e0b tags: Add regex for context_lock_struct
With the introduction of compiler context analysis (LLVM
ThreadSafetyAnalysis) the struct definition of various locks get
wrapped in a macro. This hides them from tags based navigation,
although clangd/LSP sees right through it and works as expected.

Add a regex to the tags script to help it along.

Requested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251220133307.GR3707891@noisy.programming.kicks-ass.net
2026-01-05 16:43:37 +01:00
Marco Elver
04e49d926f sched: Enable context analysis for core.c and fair.c
This demonstrates a larger conversion to use Clang's context
analysis. The benefit is additional static checking of locking rules,
along with better documentation.

Notably, kernel/sched contains sufficiently complex synchronization
patterns, and application to core.c & fair.c demonstrates that the
latest Clang version has become powerful enough to start applying this
to more complex subsystems (with some modest annotations and changes).

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-37-elver@google.com
2026-01-05 16:43:36 +01:00
Marco Elver
c237f1ceee compiler-context-analysis: Introduce header suppressions
While we can opt in individual subsystems which add the required
annotations, such subsystems inevitably include headers from other
subsystems which may not yet have the right annotations, which then
result in false positive warnings.

Making compatible by adding annotations across all common headers
currently requires an excessive number of __no_context_analysis
annotations, or carefully analyzing non-trivial cases to add the correct
annotations. While this is desirable long-term, providing an incremental
path causes less churn and headaches for maintainers not yet interested
in dealing with such warnings.

Rather than clutter headers unnecessary and mandate all subsystem
maintainers to keep their headers working with context analysis,
suppress all -Wthread-safety warnings in headers. Explicitly opt in
headers with context-enabled primitives.

With this in place, we can start enabling the analysis on more complex
subsystems in subsequent changes.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-26-elver@google.com
2026-01-05 16:43:33 +01:00
Marco Elver
25d3b21e1d checkpatch: Warn about context_unsafe() without comment
Warn about applications of context_unsafe() without a comment, to
encourage documenting the reasoning behind why it was deemed safe.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-6-elver@google.com
2026-01-05 16:43:27 +01:00
Marco Elver
3269701cb2 compiler-context-analysis: Add infrastructure for Context Analysis with Clang
Context Analysis is a language extension, which enables statically
checking that required contexts are active (or inactive), by acquiring
and releasing user-definable "context locks". An obvious application is
lock-safety checking for the kernel's various synchronization primitives
(each of which represents a "context lock"), and checking that locking
rules are not violated.

Clang originally called the feature "Thread Safety Analysis" [1]. This
was later changed and the feature became more flexible, gaining the
ability to define custom "capabilities". Its foundations can be found in
"Capability Systems" [2], used to specify the permissibility of
operations to depend on some "capability" being held (or not held).

Because the feature is not just able to express "capabilities" related
to synchronization primitives, and "capability" is already overloaded in
the kernel, the naming chosen for the kernel departs from Clang's
"Thread Safety" and "capability" nomenclature; we refer to the feature
as "Context Analysis" to avoid confusion. The internal implementation
still makes references to Clang's terminology in a few places, such as
`-Wthread-safety` being the warning option that also still appears in
diagnostic messages.

 [1] https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
 [2] https://www.cs.cornell.edu/talc/papers/capabilities.pdf

See more details in the kernel-doc documentation added in this and
subsequent changes.

Clang version 22+ is required.

[peterz: disable the thing for __CHECKER__ builds]
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-3-elver@google.com
2026-01-05 16:43:26 +01:00
Gary Guo
946c5efe6a rust: fix off-by-one line number in rustdoc tests
When the `#![allow]` line was added, the doctest line number anchor
isn't updated which causes the line number printed in kunit test to be
off-by-one.

Fixes: ab844cf320 ("rust: allow `unreachable_pub` for doctests")
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: David Gow <davidgow@google.com>
Link: https://patch.msgid.link/20251211182208.2791025-1-gary@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-01-04 23:51:35 +01:00
Paul E. McKenney
e55c2e2871 checkpatch: Deprecate rcu_read_{,un}lock_trace()
Uses of rcu_read_lock_trace() and rcu_read_unlock_trace()
are better served by the new rcu_read_lock_tasks_trace() and
rcu_read_unlock_tasks_trace() APIs.  Therefore, mark the old APIs as
deprecated.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: bpf@vger.kernel.org
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
2026-01-01 16:39:46 +08:00
Ihor Solodrai
453dece55b scripts/gen-btf.sh: Reduce log verbosity
Remove info messages from gen-btf.sh, as they are unnecessarily
detailed and sometimes inaccurate [1].  Verbose log can be produced by
passing V=1 to make, which will set -x for the shell.

[1] https://lore.kernel.org/bpf/CAADnVQ+biTSDaNtoL=ct9XtBJiXYMUqGYLqu604C3D8N+8YH9A@mail.gmail.com/

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20251231183929.65668-1-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-12-31 13:38:13 -08:00
Ihor Solodrai
1a8fa7faf4 resolve_btfids: Implement --patch_btfids
Recent changes in BTF generation [1] rely on ${OBJCOPY} command to
update .BTF_ids section data in target ELF files.

This exposed a bug in llvm-objcopy --update-section code path, that
may lead to corruption of a target ELF file. Specifically, because of
the bug st_shndx of some symbols may be (incorrectly) set to 0xffff
(SHN_XINDEX) [2][3].

While there is a pending fix for LLVM, it'll take some time before it
lands (likely in 22.x). And the kernel build must keep working with
older LLVM toolchains in the foreseeable future.

Using GNU objcopy for .BTF_ids update would work, but it would require
changes to LLVM-based build process, likely breaking existing build
environments as discussed in [2].

To work around llvm-objcopy bug, implement --patch_btfids code path in
resolve_btfids as a drop-in replacement for:

    ${OBJCOPY} --update-section .BTF_ids=${btf_ids} ${elf}

Which works specifically for .BTF_ids section:

    ${RESOLVE_BTFIDS} --patch_btfids ${btf_ids} ${elf}

This feature in resolve_btfids can be removed at some point in the
future, when llvm-objcopy with a relevant bugfix becomes common.

[1] https://lore.kernel.org/bpf/20251219181321.1283664-1-ihor.solodrai@linux.dev/
[2] https://lore.kernel.org/bpf/20251224005752.201911-1-ihor.solodrai@linux.dev/
[3] https://github.com/llvm/llvm-project/issues/168060#issuecomment-3533552952

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20251231012558.1699758-1-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-12-31 09:04:09 -08:00
Ihor Solodrai
600605853f scripts/gen-btf.sh: Fix .btf.o generation when compiling for RISCV
gen-btf.sh emits a .btf.o file with BTF sections to be linked into
vmlinux in link-vmlinux.sh

This .btf.o file is created by compiling an emptystring with ${CC},
and then adding BTF sections into it with ${OBJCOPY}.

To ensure the .btf.o is linkable when cross-compiling with LLVM, we
have to also pass ${KBUILD_FLAGS}, which in particular control the
target word size.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512240559.2M06DSX7-lkp@intel.com/
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20251229202823.569619-1-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-12-30 10:35:16 -08:00
Jose Javier Rodriguez Barbarin
1f4ea4838b mcb: Add missing modpost build support
mcb bus is not prepared to autoload client drivers with the data defined on
the drivers' MODULE_DEVICE_TABLE. modpost cannot access to mcb_table_id
inside MODULE_DEVICE_TABLE so the data declared inside is ignored.

Add modpost build support for accessing to the mcb_table_id coded on device
drivers' MODULE_DEVICE_TABLE.

Fixes: 3764e82e51 ("drivers: Introduce MEN Chameleon Bus")
Reviewed-by: Jorge Sanjuan Garcia <dev-jorge.sanjuangarcia@duagon.com>
Signed-off-by: Jose Javier Rodriguez Barbarin <dev-josejavier.rodriguez@duagon.com>
Acked-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://patch.msgid.link/20251202084200.10410-1-dev-josejavier.rodriguez@duagon.com
Signed-off-by: Nicolas Schier <nsc@kernel.org>
2025-12-27 20:48:01 +01:00
Thomas De Schampheleire
b08fc4d0ec kbuild: fix compilation of dtb specified on command-line without make rule
Since commit e7e2941300 ("kbuild: split device tree build rules into
scripts/Makefile.dtbs"), it is no longer possible to compile a device tree
blob that is not specified in a make rule
like:
    dtb-$(CONFIG_FOO) += foo.dtb

Before the mentioned commit, one could copy a dts file to e.g.
arch/arm64/boot/dts/ (or a new subdirectory) and then convert it to a dtb
file using:
    make ARCH=arm64 foo.dtb

In this scenario, both 'dtb-y' and 'dtb-' are empty, and the inclusion of
scripts/Makefile.dtbs relies on 'targets' to contain the MAKECMDGOALS. The
value of 'targets', however, is only final later in the code.

Move the conditional include of scripts/Makefile.dtbs down to where the
value of 'targets' is final. Since Makefile.dtbs updates 'always-y' which is
used as a prerequisite in the build rule, the build rule also needs to move
down.

Fixes: e7e2941300 ("kbuild: split device tree build rules into scripts/Makefile.dtbs")
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251126100017.1162330-1-thomas.de_schampheleire@nokia.com
Signed-off-by: Nicolas Schier <nsc@kernel.org>
2025-12-27 20:48:01 +01:00
Nicolas Schier
07fe35b766 Revert "scripts/clang-tools: Handle included .c files in gen_compile_commands"
This reverts commit 9362d34acf.

Dmitry Vyukov reported that commit 9362d34acf ("scripts/clang-tools:
Handle included .c files in gen_compile_commands") generates false
entries in some cases for C files that are included in other C files but
not meant for standalone compilation.

For properly supporting clangd, including .c files is discouraged.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Closes: https://lore.kernel.org/r/CACT4Y+Z8aCz0XcoJx9XXPHZSZHxGF8Kx9iUbFarhpTSEPDhMfg@mail.gmail.com
Acked-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 9362d34acf ("scripts/clang-tools: Handle included .c files in gen_compile_commands")
Link: https://patch.msgid.link/20251217-revert-scripts-clang-rools-handle-included-c-files-v1-1-def5651446da@kernel.org
Signed-off-by: Nicolas Schier <nsc@kernel.org>
2025-12-27 20:48:01 +01:00
Sami Tolvanen
ddc54f912a gendwarfksyms: Fix build on 32-bit hosts
We have interchangeably used unsigned long for some of the types
defined in elfutils, assuming they're always 64-bit. This obviously
fails when building gendwarfksyms on 32-bit hosts. Fix the types.

Reported-by: Michal Suchánek <msuchanek@suse.de>
Closes: https://lore.kernel.org/linux-modules/aRcxzPxtJblVSh1y@kitsune.suse.cz/
Tested-by: Michal Suchánek <msuchanek@suse.de>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
2025-12-22 16:35:54 +00:00
Petr Pavlu
d7afd65b4a sign-file: Use only the OpenSSL CMS API for signing
The USE_PKCS7 code in sign-file utilizes PKCS7_sign(), which allows signing
only with SHA-1. Since SHA-1 support for module signing has been removed,
drop the use of the OpenSSL PKCS7 API by the tool in favor of using only
the newer CMS API.

The use of the PKCS7 API is selected by the following:

 #if defined(LIBRESSL_VERSION_NUMBER) || \
 	OPENSSL_VERSION_NUMBER < 0x10000000L || \
 	defined(OPENSSL_NO_CMS)
 #define USE_PKCS7
 #endif

Looking at the individual ifdefs:

* LIBRESSL_VERSION_NUMBER: LibreSSL added the CMS API implementation from
  OpenSSL in 3.1.0, making the ifdef no longer relevant. This version was
  released on April 8, 2020.

* OPENSSL_VERSION_NUMBER < 0x10000000L: OpenSSL 1.0.0 was released on March
  29, 2010. Supporting earlier versions should no longer be necessary. The
  file Documentation/process/changes.rst already states that at least
  version 1.0.0 is required to build the kernel.

* OPENSSL_NO_CMS: OpenSSL can be configured with "no-cms" to disable CMS
  support. In this case, sign-file will no longer be usable. The CMS API
  support is now required.

In practice, since distributions now typically sign modules with SHA-2, for
which sign-file already required CMS API support, removing the USE_PKCS7
code shouldn't cause any issues.

Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
[Sami: Used Petr's updated commit message]
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
2025-12-22 16:35:54 +00:00
Thorsten Blum
52ad85fd33 Coccinelle: pm_runtime: Fix typo in report message
s/Unecessary/Unnecessary/

Reviewed-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
2025-12-21 21:04:52 +01:00
Songwei Chai
3766511de1 scripts: coccicheck: filter *.cocci files by MODE
Enhance the coccicheck script to filter *.cocci files based on the
specified MODE (e.g., report, patch). This ensures that only compatible
semantic patch files are executed, preventing errors such as:

    "virtual rule report not supported"

This error occurs when a .cocci file does not define a 'virtual <MODE>'
rule, yet is executed in that mode.

For example:

    make coccicheck M=drivers/hwtracing/coresight/ MODE=report

In this case, running "secs_to_jiffies.cocci" would trigger the error
because it lacks support for 'report' mode. With this change, such files
are skipped automatically, improving robustness and developer
experience.

Signed-off-by: Songwei Chai <quic_songchai@quicinc.com>
Reviewed-by: Julia Lawall <Julia.Lawall@inria.fr>
2025-12-21 21:04:45 +01:00
Nicolas Schier
f8e05c1063 kbuild: Add top-level target for building gen_init_cpio
Add a top-level target for building gen_init_cpio to prevent re-entering
kbuild for 'modules-cpio-pkg'.

The recently introduced target 'modules-cpio-pkg' depends on
gen_init_cpio but there is no simple way to add this dependency as a
prerequisite that can be built in parallel to other recipes.

Introducing the top-level target, enables fixing this and also prepares
a possible move of gen_init_cpio from usr/ to scripts/.

Signed-off-by: Nicolas Schier <nsc@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20251128-kbuild-add-top-level-target-for-building-gen_init_cpio-v1-1-84c63a8fc8d4@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-12-19 14:58:11 -07:00
Rostislav Krasny
18e2d526bf kconfig: move XPM icons to separate files
Replace deprecated gdk_pixbuf_new_from_xpm_data() with gdk_pixbuf_new_from_file()
and update both GTK and QT frontends to load XPM icons from separate files
in scripts/kconfig/icons/ instead of from the code.

xpm_menu_inv and xpm_void were removed and not converted into xpm files
because they are not used since commit 64285dc5c4 ("kconfig: gconf:
inline fill_row() into set_node()").

This eliminates the GTK deprecation warnings at compile time and
improves memory usage and code organization.

Signed-off-by: Rostislav Krasny <rostiprodev@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251217015409.30102-2-rostiprodev@gmail.com
[nathan: Minor commit message clean ups]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-12-19 13:34:33 -07:00