linux-toradex.git/scripts/Kconfig.include, branch v7.0-rc5

rust: kconfig: Don't require RUST_IS_AVAILABLE for rustc-option

2026-02-03T22:29:17+00:00

The final version of this macro does not fail in the absence of an
invokable `$(RUSTC)`, so we don't need to be careful not to invoke it.

Link: https://lore.kernel.org/all/CAGSQo01mQfcU1EiW53be1hcts0c1p-HQAab_HBk6VcVmhq3n2Q@mail.gmail.com/
Signed-off-by: Matthew Maurer 
Link: https://patch.msgid.link/20250909-docrem-v1-1-dcc69059a5cb@google.com
Signed-off-by: Nathan Chancellor

init: deduplicate cc-can-link.sh invocations

2025-11-14T19:20:34+00:00

The command to invoke scripts/cc-can-link.sh is very long and new usages
are about to be added.

Add a helper variable to make the code easier to read and maintain.

Signed-off-by: Thomas Weißschuh 
Reviewed-by: Nicolas Schier 
Reviewed-by: Nathan Chancellor 
Link: https://patch.msgid.link/20251114-kbuild-userprogs-bits-v3-2-4dee0d74d439@linutronix.de
Signed-off-by: Nicolas Schier

kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION`

2024-10-13T20:22:28+00:00

Each version of Rust supports a range of LLVM versions. There are cases where
we want to gate a config on the LLVM version instead of the Rust version.
Normalized cfi integer tags are one example [1].

The invocation of rustc-version is being moved from init/Kconfig to
scripts/Kconfig.include for consistency with cc-version.

Link: https://lore.kernel.org/all/20240925-cfi-norm-kasan-fix-v1-1-0328985cdf33@google.com/ [1]
Signed-off-by: Gary Guo 
Link: https://lore.kernel.org/r/20241011114040.3900487-1-gary@garyguo.net
[ Added missing `-llvm` to the Usage documentation. - Miguel ]
Signed-off-by: Miguel Ojeda

kbuild: rust: Define probing macros for rustc

2024-09-16T16:04:37+00:00

Creates flag probe macro variants for `rustc`. These are helpful
because:

1. The kernel now supports a minimum `rustc` version rather than a
   single version.
2. `rustc` links against a range of LLVM revisions, occasionally even
   ones without an official release number. Since the availability of
   some Rust flags depends on which LLVM it has been linked against,
   probing is necessary.

Signed-off-by: Matthew Maurer 
Link: https://github.com/Rust-for-Linux/linux/pull/1087
Link: https://lore.kernel.org/r/20240820194910.187826-2-mmaurer@google.com
Signed-off-by: Miguel Ojeda

x86/kconfig: Add as-instr64 macro to properly evaluate AS_WRUSS

2024-06-20T17:48:18+00:00

Some instructions are only available on the 64-bit architecture.

Bi-arch compilers that default to -m32 need the explicit -m64 option
to evaluate them properly.

Fixes: 18e66b695e78 ("x86/shstk: Add Kconfig option for shadow stack")
Closes: https://lore.kernel.org/all/20240612-as-instr-opt-wrussq-v2-1-bd950f7eead7@gmail.com/
Reported-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Masahiro Yamada 
Signed-off-by: Borislav Petkov (AMD) 
Tested-by: Dmitry Safonov <0x7f454c46@gmail.com>
Link: https://lore.kernel.org/r/20240612050257.3670768-1-masahiroy@kernel.org

kbuild: Add -Wa,--fatal-warnings to as-instr invocation

2024-02-17T00:07:07+00:00

Certain assembler instruction tests may only induce warnings from the
assembler on an unsupported instruction or option, which causes as-instr
to succeed when it was expected to fail. Some tests workaround this
limitation by additionally testing that invalid input fails as expected.
However, this is fragile if the assembler is changed to accept the
invalid input, as it will cause the instruction/option to be unavailable
like it was unsupported even when it is.

Use '-Wa,--fatal-warnings' in the as-instr macro to turn these warnings
into hard errors, which avoids this fragility and makes tests more
robust and well formed.

Cc: stable@vger.kernel.org
Suggested-by: Eric Biggers 
Signed-off-by: Nathan Chancellor 
Tested-by: Eric Biggers 
Tested-by: Andy Chiu 
Reviewed-by: Andy Chiu 
Tested-by: Conor Dooley 
Reviewed-by: Conor Dooley 
Acked-by: Masahiro Yamada 
Link: https://lore.kernel.org/r/20240125-fix-riscv-option-arch-llvm-18-v1-1-390ac9cc3cd0@kernel.org
Signed-off-by: Palmer Dabbelt

kbuild: Update assembler calls to use proper flags and language target

2023-01-26T03:41:38+00:00

as-instr uses KBUILD_AFLAGS, but as-option uses KBUILD_CFLAGS. This can
cause as-option to fail unexpectedly when CONFIG_WERROR is set, because
clang will emit -Werror,-Wunused-command-line-argument for various -m
and -f flags in KBUILD_CFLAGS for assembler sources.

Callers of as-option and as-instr should be adding flags to
KBUILD_AFLAGS / aflags-y, not KBUILD_CFLAGS / cflags-y. Use
KBUILD_AFLAGS in all macros to clear up the initial problem.

Unfortunately, -Wunused-command-line-argument can still be triggered
with clang by the presence of warning flags or macro definitions because
'-x assembler' is used, instead of '-x assembler-with-cpp', which will
consume these flags. Switch to '-x assembler-with-cpp' in places where
'-x assembler' is used, as the compiler is always used as the driver for
out of line assembler sources in the kernel.

Finally, add -Werror to these macros so that they behave consistently
whether or not CONFIG_WERROR is set.

[nathan: Reworded and expanded on problems in commit message
         Use '-x assembler-with-cpp' in a couple more places]

Link: https://github.com/ClangBuiltLinux/linux/issues/1699
Suggested-by: Masahiro Yamada 
Signed-off-by: Nick Desaulniers 
Signed-off-by: Nathan Chancellor 
Tested-by: Linux Kernel Functional Testing 
Tested-by: Anders Roxell 
Signed-off-by: Masahiro Yamada

Kbuild: add Rust support

2022-09-28T07:02:20+00:00

Having most of the new files in place, we now enable Rust support
in the build system, including `Kconfig` entries related to Rust,
the Rust configuration printer and a few other bits.

Reviewed-by: Kees Cook 
Reviewed-by: Nick Desaulniers 
Tested-by: Nick Desaulniers 
Reviewed-by: Greg Kroah-Hartman 
Co-developed-by: Alex Gaynor 
Signed-off-by: Alex Gaynor 
Co-developed-by: Finn Behrens 
Signed-off-by: Finn Behrens 
Co-developed-by: Adam Bratschi-Kaye 
Signed-off-by: Adam Bratschi-Kaye 
Co-developed-by: Wedson Almeida Filho 
Signed-off-by: Wedson Almeida Filho 
Co-developed-by: Michael Ellerman 
Signed-off-by: Michael Ellerman 
Co-developed-by: Sven Van Asbroeck 
Signed-off-by: Sven Van Asbroeck 
Co-developed-by: Gary Guo 
Signed-off-by: Gary Guo 
Co-developed-by: Boris-Chengbiao Zhou 
Signed-off-by: Boris-Chengbiao Zhou 
Co-developed-by: Boqun Feng 
Signed-off-by: Boqun Feng 
Co-developed-by: Douglas Su 
Signed-off-by: Douglas Su 
Co-developed-by: Dariusz Sosnowski 
Signed-off-by: Dariusz Sosnowski 
Co-developed-by: Antonio Terceiro 
Signed-off-by: Antonio Terceiro 
Co-developed-by: Daniel Xu 
Signed-off-by: Daniel Xu 
Co-developed-by: Björn Roy Baron 
Signed-off-by: Björn Roy Baron 
Co-developed-by: Martin Rodriguez Reboredo 
Signed-off-by: Martin Rodriguez Reboredo 
Signed-off-by: Miguel Ojeda

kbuild: set EXIT trap before creating temporary directory

2022-08-03T13:56:38+00:00

Swap the order of 'mkdir' and 'trap' just in case the subshell is
interrupted between 'mkdir' and 'trap' although the effect might be
subtle.

This does not intend to make the cleanup perfect. There are more cases
that miss to remove the tmp directory, for example:

 - When interrupted, dash does not invoke the EXIT trap (bash does)

 - 'rm' command might be interrupted before removing the directory

I am not addressing all the cases since the tmp directory is harmless
after all.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Nick Desaulniers

kconfig: shorten the temporary directory name for cc-option

2022-07-27T12:18:00+00:00

The cc-option macro creates the temporary directory, .tmp_$$$$.
Shell expands '$$' into its process ID. '$$$$' results in repeated PID.

In Makefile, '$$$$' is correct (see TMPOUT in scripts/Malefile.compiler)
because '$$' is an escape sequence of '$'. Make expands '$$$$' into '$$',
then shell expands it into the process ID.

This does not apply to Kconfig because Kconfig requires variable
references to be enclosed by curly braces, like ${variable}.
The '$' that is not followed by '{' loses its effect.

Signed-off-by: Masahiro Yamada 
Tested-by: Nicolas Schier