From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Chuck Wolber <chuck@wolber.net>,
Julian Braha <julianbraha@gmail.com>,
linux-kbuild@vger.kernel.org, Marco Elver <elver@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nsc@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@kernel.org>
Subject: [RFC PATCH 18/20] kconfig: add CC_HAS_CONDITION_COVERAGE for MC/DC support detection
Date: Wed, 28 Oct 2026 07:59:42 -0400 [thread overview]
Message-ID: <20261028120034.871983-19-sashal@kernel.org> (raw)
In-Reply-To: <20261028120034.871983-1-sashal@kernel.org>
Add a Kconfig symbol to detect compiler support for -fcondition-coverage,
which enables MC/DC (Modified Condition/Decision Coverage) instrumentation.
This flag is available since GCC 14.
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
scripts/Kconfig.toolchain | 3 +++
1 file changed, 3 insertions(+)
diff --git a/scripts/Kconfig.toolchain b/scripts/Kconfig.toolchain
index 4b962831d62af..f66b6efacee6c 100644
--- a/scripts/Kconfig.toolchain
+++ b/scripts/Kconfig.toolchain
@@ -144,6 +144,9 @@ config CC_HAS_ASSUME
config CC_HAS_NO_PROFILE_FN_ATTR
def_bool $(success,echo '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
+config CC_HAS_CONDITION_COVERAGE
+ def_bool $(cc-option,-fcondition-coverage)
+
config CC_OPT_ZERO_INIT_PADDING_BITS
def_string "$(cc-option-str,-fzero-init-padding-bits=all)"
--
2.53.0
next prev parent reply other threads:[~2026-10-28 12:01 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
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 ` Sasha Levin [this message]
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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