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[195.23.151.163]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6db0b95asm39394605e9.9.2026.05.09.13.38.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 May 2026 13:38:15 -0700 (PDT) Sender: Julian Braha From: Julian Braha To: nathan@kernel.org, nsc@kernel.org Cc: jani.nikula@linux.intel.com, akpm@linux-foundation.org, gary@garyguo.net, ljs@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, masahiroy@kernel.org, ojeda@kernel.org, corbet@lwn.net, qingfang.deng@linux.dev, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, Julian Braha Subject: [RFC PATCH v2 1/2] scripts: add kconfirm Date: Sat, 9 May 2026 21:38:07 +0100 Message-ID: <20260509203808.1142311-2-julianbraha@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260509203808.1142311-1-julianbraha@gmail.com> References: <20260509203808.1142311-1-julianbraha@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add kconfirm into scripts/ kconfirm is a static analysis tool with various checks for Kconfig, and intended to have zero false alarms by default. These default checks currently include dead code, constant conditions, and invalid (reverse) ranges. There are also optional checks for dead links in the help texts, and for config options that select visible config options. Checks are performed for all architectures, using a single thread. Alarms that are specific to one or multiple architectures are tagged using the architectures' config options, like so: [X86] or [X86, ARM]. Each alarm gets a single line (deduplicated across architectures) and is formatted like this: [] [, ] config : The tool source contains two Rust packages: kconfirm-lib and kconfirm-linux. kconfirm-lib is the underlying library that analyzes Kconfig code, and formats alarms for usability. It analyzes the entire Linux Kconfig spec, including all architectures. This package exposes the symbol table that it constructs so that other tools can import this library, and make use of it for their own Kconfig analyses. kconfirm-linux imports kconfirm-lib, and provides the CLI, which is intended for either manual usage, or integration with the Linux build system so that users can simply run `make kconfirm` from the root. kconfirm-linux also handles some of the specificities of how Kconfig is used in the Linux tree, in contrast to other open source software. E.g. the way that each architecture has its own Kconfig and Kconfig.debug files, rather than being sourced from the root Kconfig. The tool's dependencies are vendored in scripts/kconfirm/vendor/ so that kconfirm can be compiled without an internet connection. NOTE: the full size of kconfirm with vendored dependencies is too large for email (49mb), so the full patchset is available in my linux fork, git branch 'kconfirm_rfc2', and is based on linux v7.1-rc2: https://github.com/julianbraha/linux/tree/kconfirm_rfc2 This patch actually includes everything _but_ the vendored dependencies. Signed-off-by: Julian Braha --- Makefile | 11 +- scripts/Makefile | 2 +- scripts/kconfirm/.gitignore | 3 + scripts/kconfirm/Cargo.toml | 12 + scripts/kconfirm/LICENSE | 339 +++++++++ scripts/kconfirm/Makefile | 29 + scripts/kconfirm/kconfirm-lib/Cargo.toml | 16 + scripts/kconfirm/kconfirm-lib/src/analyze.rs | 658 +++++++++++++++++ scripts/kconfirm/kconfirm-lib/src/checks.rs | 694 ++++++++++++++++++ .../kconfirm/kconfirm-lib/src/dead_links.rs | 83 +++ scripts/kconfirm/kconfirm-lib/src/lib.rs | 62 ++ scripts/kconfirm/kconfirm-lib/src/output.rs | 114 +++ .../kconfirm/kconfirm-lib/src/symbol_table.rs | 228 ++++++ scripts/kconfirm/kconfirm-linux/Cargo.toml | 12 + scripts/kconfirm/kconfirm-linux/src/lib.rs | 119 +++ scripts/kconfirm/kconfirm-linux/src/main.rs | 82 +++ scripts/kconfirm/vendor_dependencies.sh | 1 + 17 files changed, 2463 insertions(+), 2 deletions(-) create mode 100644 scripts/kconfirm/.gitignore create mode 100644 scripts/kconfirm/Cargo.toml create mode 100644 scripts/kconfirm/LICENSE create mode 100644 scripts/kconfirm/Makefile create mode 100644 scripts/kconfirm/kconfirm-lib/Cargo.toml create mode 100644 scripts/kconfirm/kconfirm-lib/src/analyze.rs create mode 100644 scripts/kconfirm/kconfirm-lib/src/checks.rs create mode 100644 scripts/kconfirm/kconfirm-lib/src/dead_links.rs create mode 100644 scripts/kconfirm/kconfirm-lib/src/lib.rs create mode 100644 scripts/kconfirm/kconfirm-lib/src/output.rs create mode 100644 scripts/kconfirm/kconfirm-lib/src/symbol_table.rs create mode 100644 scripts/kconfirm/kconfirm-linux/Cargo.toml create mode 100644 scripts/kconfirm/kconfirm-linux/src/lib.rs create mode 100644 scripts/kconfirm/kconfirm-linux/src/main.rs create mode 100644 scripts/kconfirm/vendor_dependencies.sh diff --git a/Makefile b/Makefile index 9f88dcaae382..f0327dbcb7b0 100644 --- a/Makefile +++ b/Makefile @@ -2225,7 +2225,7 @@ endif # Scripts to check various things for consistency # --------------------------------------------------------------------------- -PHONY += includecheck versioncheck coccicheck +PHONY += includecheck versioncheck coccicheck kconfirm includecheck: find $(srctree)/* $(RCS_FIND_IGNORE) \ @@ -2240,6 +2240,15 @@ versioncheck: coccicheck: $(Q)$(BASH) $(srctree)/scripts/$@ +kconfirm: + $(Q)$(MAKE) -C scripts/kconfirm + +# kconfirm is compiled and has its own build artifacts +PHONY += kconfirmclean + +kconfirmclean: + $(Q)$(MAKE) -C scripts/kconfirm clean + PHONY += checkstack kernelrelease kernelversion image_name # UML needs a little special treatment here. It wants to use the host diff --git a/scripts/Makefile b/scripts/Makefile index 3434a82a119f..f257e4514489 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -54,7 +54,7 @@ HOSTCFLAGS_sorttable.o += -DMCOUNT_SORT_ENABLED endif # The following programs are only built on demand -hostprogs += unifdef gen_packed_field_checks +hostprogs += unifdef gen_packed_field_checks kconfirm # The module linker script is preprocessed on demand targets += module.lds diff --git a/scripts/kconfirm/.gitignore b/scripts/kconfirm/.gitignore new file mode 100644 index 000000000000..f64f232d94f2 --- /dev/null +++ b/scripts/kconfirm/.gitignore @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +/target +/Cargo.lock diff --git a/scripts/kconfirm/Cargo.toml b/scripts/kconfirm/Cargo.toml new file mode 100644 index 000000000000..ebf1bf32920a --- /dev/null +++ b/scripts/kconfirm/Cargo.toml @@ -0,0 +1,12 @@ +[workspace] +members = ["kconfirm-lib", "kconfirm-linux"] +resolver = "3" + +[workspace.package] +rust-version = "1.85.0" + +[workspace.dependencies] +nom-kconfig = "0.10" +log = "0.4" +env_logger = "0.11" +clap = { version = "4.6", features = ["derive"] } diff --git a/scripts/kconfirm/LICENSE b/scripts/kconfirm/LICENSE new file mode 100644 index 000000000000..d159169d1050 --- /dev/null +++ b/scripts/kconfirm/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/scripts/kconfirm/Makefile b/scripts/kconfirm/Makefile new file mode 100644 index 000000000000..8b01ac967f67 --- /dev/null +++ b/scripts/kconfirm/Makefile @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0 +# kconfirm makefile + +TARGET := kconfirm + +HAS_CARGO := $(shell command -v cargo 2> /dev/null) + +# Extra arguments forwarded to kconfirm. +# Example: make kconfirm KCONFIRM_ARGS="--enable dead_links" +KCONFIRM_ARGS ?= + +PHONY += all +all: $(TARGET) + +$(TARGET): +ifdef HAS_CARGO + @cargo run --release --offline -p kconfirm-linux -- --linux-path ../../ $(KCONFIRM_ARGS) +else + @echo "Error: Cargo not found. Please install Rust and Cargo to build kconfirm." + @false +endif + +clean: +ifdef HAS_CARGO + @cargo clean > /dev/null 2>&1 +else + @: +endif + @rm -f Cargo.lock diff --git a/scripts/kconfirm/kconfirm-lib/Cargo.toml b/scripts/kconfirm/kconfirm-lib/Cargo.toml new file mode 100644 index 000000000000..90c04d3394f5 --- /dev/null +++ b/scripts/kconfirm/kconfirm-lib/Cargo.toml @@ -0,0 +1,16 @@ +[package] +name = "kconfirm-lib" +version = "0.9.0" +edition = "2024" +rust-version.workspace = true + +[dependencies] +nom-kconfig = { workspace = true } +log = { workspace = true } +env_logger = { workspace = true } +ureq = { version = "3.3", default-features = false, features = ["native-tls"] } +regex = { version = "1.12", default-features = false } + +[features] +default = [] +coreboot = ["nom-kconfig/coreboot"] diff --git a/scripts/kconfirm/kconfirm-lib/src/analyze.rs b/scripts/kconfirm/kconfirm-lib/src/analyze.rs new file mode 100644 index 000000000000..366213283f8c --- /dev/null +++ b/scripts/kconfirm/kconfirm-lib/src/analyze.rs @@ -0,0 +1,658 @@ +// SPDX-License-Identifier: GPL-2.0-only + +use crate::AnalysisArgs; +use crate::Check; +use crate::SymbolTable; +use crate::dead_links::{self, LinkStatus, check_link}; +use crate::output::{Finding, Severity}; +use crate::symbol_table::ChoiceData; + +use log::error; +use log::{debug, warn}; +use nom_kconfig::attribute::DefaultAttribute; +use nom_kconfig::attribute::Expression; +use nom_kconfig::attribute::Imply; +use nom_kconfig::attribute::Select; +use nom_kconfig::attribute::r#type::Type; +use nom_kconfig::entry::Choice; +use nom_kconfig::entry::Config; +use nom_kconfig::entry::If; +use nom_kconfig::entry::Menu; +use nom_kconfig::entry::Source; +use nom_kconfig::{ + Attribute::*, + Entry::{self}, +}; +use std::collections::HashSet; +use std::option::Option; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +enum FunctionalAttributes { + // only tracking the attributes that affect the semantics, e.g. not help texts + Dependencies, + Selects, + Implies, + Ranges, + Defaults, +} + +struct AttributeGroupingChecker { + current_group: Option, + finished_groups: HashSet, +} + +impl AttributeGroupingChecker { + fn new() -> Self { + Self { + current_group: None, + finished_groups: HashSet::new(), + } + } + + // doesn't modify `findings` if the style check is disabled + fn check( + &mut self, + group: FunctionalAttributes, + args: &AnalysisArgs, + findings: &mut Vec, + symbol: &str, + arch: &Option, + message: String, + ) { + if !args.is_enabled(Check::UngroupedAttribute) { + return; + } + + match self.current_group { + // still contiguous + Some(current) if current == group => {} + + // start of group + None => { + self.current_group = Some(group); + } + + Some(current) => { + // the previous group finished + self.finished_groups.insert(current); + + // we've already finished this group, it's ungrouped + if self.finished_groups.contains(&group) { + findings.push(Finding { + severity: Severity::Style, + check: Check::UngroupedAttribute, + symbol: Some(symbol.to_string()), + message, + arch: arch.to_owned(), + }); + } + + // switch to the new group + self.current_group = Some(group); + } + } + } +} + +struct DeadLinkChecker { + visited_links: HashSet, +} + +impl DeadLinkChecker { + fn new() -> Self { + Self { + visited_links: HashSet::new(), + } + } + + fn check_text( + &mut self, + text: &str, + args: &AnalysisArgs, + findings: &mut Vec, + symbol: Option<&str>, + arch: &Option, + context: &str, + ) { + if !args.is_enabled(Check::DeadLink) { + return; + } + + let links = dead_links::find_links(text); + + if links.is_empty() { + return; + } + + debug!("{} links are: {:?}", context, links); + + for link in links { + // avoid rechecking identical links + if !self.visited_links.insert(link.clone()) { + continue; + } + + let status = check_link(&link); + if status != LinkStatus::Ok && status != LinkStatus::ProbablyBlocked { + findings.push(Finding { + severity: Severity::Warning, + check: Check::DeadLink, + symbol: symbol.map(|s| s.to_string()), + message: format!( + "{} contains link {} with status {:?}", + context, link, status + ), + arch: arch.to_owned(), + }); + } + } + } +} + +#[derive(Clone)] +pub struct Context { + pub arch: Option, + pub definition_condition: Vec, + pub visibility: Vec>, + pub dependencies: Vec, + pub in_choice: bool, +} + +impl Context { + fn with_arch(arch: Option) -> Context { + Context { + arch, + definition_condition: vec![], + visibility: vec![], + dependencies: vec![], + in_choice: false, + } + } + + fn child(&self) -> Self { + self.clone() + } + + fn with_dep(mut self, dep: Expression) -> Self { + self.dependencies.push(dep); + self + } + + fn with_visibility(mut self, cond: Option) -> Self { + self.visibility.push(cond); + self + } + + fn with_definition(mut self, cond: Expression) -> Self { + self.definition_condition.push(cond); + self + } + + fn in_choice(mut self) -> Self { + self.in_choice = true; + self + } +} + +fn recurse_entries( + args: &AnalysisArgs, + symtab: &mut SymbolTable, + entries: Vec, + ctx: Context, + findings: &mut Vec, +) { + for entry in entries { + process_entry(args, symtab, entry, ctx.clone(), findings); + } +} + +pub fn analyze( + args: &AnalysisArgs, + symtab: &mut SymbolTable, + arch: Option, + entries: Vec, +) -> Vec { + let mut findings = Vec::new(); + + let ctx = Context::with_arch(arch); + + recurse_entries(args, symtab, entries, ctx, &mut findings); + + findings +} + +fn handle_config( + args: &AnalysisArgs, + symtab: &mut SymbolTable, + entry: Config, + ctx: &Context, + findings: &mut Vec, +) { + let config_symbol = entry.symbol; + debug!( + "starting to process config option `config` type: {}", + config_symbol + ); + + let mut child_ctx = ctx.child(); + + let mut config_type = None; + let mut kconfig_dependencies = Vec::new(); + let mut kconfig_selects: Vec