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[69.131.150.190]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd6656542bsm142388807b3.20.2026.05.10.21.24.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 10 May 2026 21:24:35 -0700 (PDT) Message-ID: <8fe7c7c8-00f7-4a72-a984-e929f71bec22@gmail.com> Date: Mon, 11 May 2026 00:24:28 -0400 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC v2 0/2] add kconfirm To: Julian Braha , 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 References: <20260509203808.1142311-1-julianbraha@gmail.com> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------Og8FpgSqdy3q3Rgn1CUcqUQ5" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------Og8FpgSqdy3q3Rgn1CUcqUQ5 Content-Type: multipart/mixed; boundary="------------BF63B0nlCsUcMK0VcYUWq5Py"; protected-headers="v1" Message-ID: <8fe7c7c8-00f7-4a72-a984-e929f71bec22@gmail.com> Date: Mon, 11 May 2026 00:24:28 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC v2 0/2] add kconfirm To: Julian Braha , 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 References: <20260509203808.1142311-1-julianbraha@gmail.com> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------54VcMcIqm52epLx8hGRv2nyE" --------------54VcMcIqm52epLx8hGRv2nyE Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 5/9/26 16:38, Julian Braha wrote: > Hi all, >=20 > kconfirm is a tool to detect misusage of Kconfig. It detects dead code,= > constant conditions, and invalid (reverse) ranges. There are also optio= nal > checks to detect config options that select visible config options, and= to > check for dead links in the help texts. >=20 > The full patchset (with the vendored dependencies) 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 >=20 > The patches sent here with the RFC include everything other than the > vendored dependencies, including the tool's code, the documentation, an= d > the makefile changes. >=20 > Following this discussion: > https://lore.kernel.org/all/20260405122749.4990dcb538d457769a3276e0@lin= ux-foundation.org/ > in which Andrew brought up the possibility of moving kconfirm in-tree, > I've prepared this RFC to do so. See also kconfirm's introduction to th= e > mailing list: > https://lore.kernel.org/all/6ec4df6d-1445-48ca-8f54-1d1a83c4716d@gmail.= com/ >=20 > False Alarms: > kconfirm aims for zero false-positives, which is currently true for the= > default checks (as far as I'm aware - but there are hundreds to go > through); this is not really possible for dead link checks, as this > depends on an internet connection, and we do not attempt to bypass bot > blocks. For this reason, dead link checking is disabled by default, but= > I've provided an example below of how to enable it. Additionally, you c= an > view my previous message to the mailing list with hand-verified dead li= nks > here: > https://lore.kernel.org/all/6732bf08-41ee-40c4-83b2-4ae8bc0da7cf@gmail.= com/ >=20 > Additionally, there is an optional check to detect config options that > select visible config options, as requested by Jani during the review o= f > the first version of this RFC: > https://lore.kernel.org/all/dcb7439832f0bb35598fba653d922b5f6a4d0058@in= tel.com/ >=20 > Even after deduplicating across architectures, there are well over 1,00= 0 > instances of these select-visible cases, and I suspect that, despite th= e > Kconfig documentation saying select-visible should be avoided, some > exceptions will be made. So, I have left this check disabled by default= , > keeping in line with the goal of having a low-noise checker. If interes= ted > in using it, I have included an example below of how to enable this che= ck. >=20 > Current State of Alarms: > On Linux v7.1-rc2 (which this RFC is based), there are 489 alarms comin= g > from the default set of checks, and an additional 1,789 alarms if enabl= ing > the optional select-visible check. These counts are with deduplication > across architectures, a change that was made to the tool's CLI from RFC= v1 > to RFC v2. The last time I checked linux-next (next-20260427), there we= re > 81 unique dead links. >=20 > The most critical check is the dead default statements, which has surfa= ced > a few misconfiguration bugs (fortunately, just for kunit tests), see > examples: > https://lore.kernel.org/all/20260323124118.1414913-1-julianbraha@gmail.= com/ > and: > https://lore.kernel.org/all/20260323123536.1413732-1-julianbraha@gmail.= com/ >=20 > But hopefully kconfirm can ease maintenance and we can prevent more of > these from making it into the tree in the future. >=20 > Use it: > You can test out kconfirm with this patch series by compiling and runni= ng > kconfirm like this: >=20 > `make kconfirm` >=20 > To enable the select-visible check: > `KCONFIRM_ARGS=3D"--enable select_visible" make kconfirm` >=20 > And to enable dead link checks in the help texts: > `KCONFIRM_ARGS=3D"--enable dead_links" make kconfirm` >=20 > Note that it is not architecture-specific; it runs tree-wide. Any alarm= s > that are specific to one or more architectures will have a tag using th= e > config option(s) of the architecture(s), for example: [X86] or [X86, AR= M] >=20 > The dependencies are vendored in scripts/kconfirm/vendor so that no > internet connection is needed to compile the code. The total size of th= e > tool with dependencies is 49mb, making it a large amount of code, thoug= h > still in the ballpark of perf, at 42mb.=20 >=20 > I managed to reduce the size of the vendored dependencies from 264mb by= > taking multiple approaches: > 1. Removed 'rustls' for TLS and instead use the user's system OpenSSL > 2. Replaced the 'reqwest' crate with the smaller 'ureq' crate > 3. Disabled the default features of the dependencies, and only enabled > whatever is needed by kconfirm > 3. Filtered out various things from the vendored dependencies unneeded = for > compilation (e.g. docs & tests for dependencies) > 4. Filtered out platform-specific code that isn't needed for linux > developers (e.g. Nintendo 3DS) >=20 > The script I ran to generate the vendored dependencies with filtering i= s > available in scripts/kconfirm/vendor_dependencies.sh=20 > =20 > Requested feedback: > 1. I would like to know if anyone thinks that the select-visible check > should be enabled by default.=20 > 2. The only "person" that commented on `make clean` deleting the compil= ed > kconfirm binary/artifacts was sashiko-bot. Now, there is just > `make kconfirmclean` for deleting 'scripts/kconfirm/release/', and > `make clean` no longer touches kconfirm. Please let me know if anyone h= as > requested changes on the integration with Make. >=20 > Thanks, > Julian Braha > --- > Changes since v1: > - vendored dependencies instead of requiring an internet connection > - removed Cargo.lock > - replaced reqwest dependency with smaller ureq > - removed rustls, expect user to have openssl instead > - added select-visible check based on Jani's feature request > - added invalid (reverse) range check > - deduplicating alarms that appear for multiple architectures > - `make clean` no longer deletes kconfirm's build artifacts > - typo fixes in documentation > - added patch description for the main "add kconfirm" patch (patch 1/2)= >=20 > Link to v1: > https://lore.kernel.org/all/20260427174429.779474-1-julianbraha@gmail.c= om/ > --- This adds too many dependencies. Some suggestions: - Use system libcurl instead of ureq. - Use libc getopt_long instead of clap. - Use manual FFI bindings instead of third-party crates. - Use the C Kconfig parser instead of a third-party library. 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