From: Nathan Chancellor <nathan@kernel.org>
To: Sasha Levin <sashal@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Wentao Zhang <wentaoz5@illinois.edu>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Bill Wendling <morbo@google.com>, Chuck Wolber <chuck@wolber.net>,
Dmitry Vyukov <dvyukov@google.com>,
Justin Stitt <justinstitt@google.com>,
kasan-dev@googlegroups.com, linux-kbuild@vger.kernel.org,
llvm@lists.linux.dev, Marco Elver <elver@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nicolas Schier <nsc@kernel.org>,
Peter Oberparleiter <oberpar@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@kernel.org>
Subject: Re: [RFC PATCH 16/20] coverage: add MC/DC measurement
Date: Wed, 28 Oct 2026 12:14:32 -0700 [thread overview]
Message-ID: <20261028191432.GA669102@ax162> (raw)
In-Reply-To: <20261028120034.871983-17-sashal@kernel.org>
On Wed, Oct 28, 2026 at 07:59:40AM -0400, Sasha Levin wrote:
> Larger decisions, and decisions the compiler can't instrument, produce
> warnings. Starting with Clang 22 they are kept from becoming errors
> with CONFIG_WERROR; older versions can't be used together with it.
What is the reason for keeping these warnings in the build as opposed to
just disabling them altogether? Are developers expected to address them
and if so, how? It seems odd to keep them in the build but prevent them
from breaking the build unless they are not intended to be acted on, in
which case they should just be disabled outright.
--
Cheers,
Nathan
next prev parent reply other threads:[~2026-10-28 19:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 11:59 [RFC PATCH 00/20] Unify code coverage and add Clang source-based coverage with MC/DC Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 01/20] coverage: move gcov and kcov under kernel/coverage/ Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 02/20] kbuild: unify static coverage instrumentation as COVERAGE_PROFILE Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 03/20] coverage: add a common debugfs interface Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 04/20] compiler_types.h: Don't instrument __always_inline functions for coverage Sasha Levin
2026-10-28 13:51 ` Peter Zijlstra
2026-10-28 14:01 ` Peter Zijlstra
2026-10-28 16:45 ` Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 05/20] context_tracking: Always inline the empty stubs called from noinstr code Sasha Levin
2026-10-28 13:52 ` Peter Zijlstra
2026-10-28 11:59 ` [RFC PATCH 06/20] lockdep: " Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 07/20] perf: Always inline the empty perf_lopwr_cb() stub Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 08/20] rseq: Always inline the empty rseq_note_user_irq_entry() stub Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 09/20] x86: Always inline empty stubs called from noinstr code Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 10/20] x86/sev: Use non-instrumented bitops in the GHCB accessors Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 11/20] objtool: Detect code coverage instrumentation in noinstr code Sasha Levin
2026-10-28 14:11 ` Peter Zijlstra
2026-10-28 16:45 ` Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 12/20] x86/sev: Stop excluding noinstr.o from code coverage Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 13/20] x86/entry: Stop excluding the entry code from KCOV Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 14/20] coverage: add Clang's source-based code coverage Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 15/20] x86: Enable " Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 16/20] coverage: add MC/DC measurement Sasha Levin
2026-10-28 19:14 ` Nathan Chancellor [this message]
2026-10-28 20:39 ` Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 17/20] gcov: fix gcov_info_add() merge semantics for IOR counters Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 18/20] kconfig: add CC_HAS_CONDITION_COVERAGE for MC/DC support detection Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 19/20] gcov: add MC/DC condition coverage support Sasha Levin
2026-10-28 11:59 ` [RFC PATCH 20/20] Documentation: dev-tools: document the common code coverage interface Sasha Levin
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