lib/Kconfig.debug: Require a release version of LLVM 22 for context analysis

Using a prerelease version as a minimum supported version for
CONFIG_WARN_CONTEXT_ANALYSIS was reasonable to do while LLVM 22 was the
development version so that people could immediately build from main and
start testing and validating this in their own code. However, it can be
problematic when using prerelease versions of LLVM 22, such as Android
clang 22.0.1 (the current android mainline compiler) or when bisecting
LLVM between llvmorg-22-init and llvmorg-23-init, to build the kernel,
as all compiler fixes for the context analysis may not be present,
potentially resulting in warnings that can easily turn into errors.

Now that LLVM 22 is released as 22.1.0, upgrade the check to require at
least this version to ensure that a user's toolchain actually has all
the changes needed for a smooth experience with context analysis.

Fixes: 3269701cb256 ("compiler-context-analysis: Add infrastructure for Context Analysis with Clang")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Marco Elver <elver@google.com>
Link: https://patch.msgid.link/20260224-bump-clang-ver-context-analysis-v1-1-16cc7a90a040@kernel.org

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4e2dfbbd3d7863029fb38810031a786aa5d6b6d9..8e2b858078e6f31b8d9b3650d24b5408095635e6 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -630,7 +630,7 @@ config DEBUG_FORCE_WEAK_PER_CPU
 
 config WARN_CONTEXT_ANALYSIS
        bool "Compiler context-analysis warnings"
-       depends on CC_IS_CLANG && CLANG_VERSION >= 220000
+       depends on CC_IS_CLANG && CLANG_VERSION >= 220100
        # Branch profiling re-defines "if", which messes with the compiler's
        # ability to analyze __cond_acquires(..), resulting in false positives.
        depends on !TRACE_BRANCH_PROFILING
@@ -641,7 +641,7 @@ config WARN_CONTEXT_ANALYSIS
          and releasing user-definable "context locks".
 
          Clang's name of the feature is "Thread Safety Analysis". Requires
-         Clang 22 or later.
+         Clang 22.1.0 or later.
 
          Produces warnings by default. Select CONFIG_WERROR if you wish to
          turn these warnings into errors.