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Wed, 23 Jul 2025 07:03:08 -0700 (PDT) Received: from ABZPC-86BPZX2.aberdeen.dnoheather.co.uk ([4.234.100.150]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4586918b65dsm24243325e9.10.2025.07.23.07.03.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jul 2025 07:03:08 -0700 (PDT) From: Raka Gunarto To: linux-kernel@vger.kernel.org Cc: Raka Gunarto Subject: [RFC PATCH 1/1] compiler_types.h: introduce ASSUME_NONNULL macro for static analysis Date: Wed, 23 Jul 2025 15:03:01 +0100 Message-ID: <20250723140301.277089-1-rakagunarto@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250723140129.276874-1-rakagunarto@gmail.com> References: <20250723140129.276874-1-rakagunarto@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This macro suppresses false positives for Clang's static analyzer by asserting a pointer is invariably non-null. It has no side-effects in normal conditions by including a guard to check for the analyzer's presence. Signed-off-by: Raka Gunarto --- include/linux/compiler-clang.h | 10 ++++++++++ include/linux/compiler_types.h | 5 +++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h index 4fc8e26914ad..c25bb1a855c4 100644 --- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -136,3 +136,13 @@ * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL. */ #define CC_HAS_TYPEOF_UNQUAL (__clang_major__ >=3D 19) + +/* + * Tell static code analysis tools that this pointer is + * invariably non-null + */ +#if defined(__clang_analyzer__) && __has_builtin(__builtin_assume) + #define ASSUME_NONNULL(ptr) do { __builtin_assume((ptr) !=3D NULL); } wh= ile (0) +#else + #define ASSUME_NONNULL(ptr) do { } while (0) +#endif \ No newline at end of file diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 2b77d12e07b2..26126fd915be 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -594,4 +594,9 @@ struct ftrace_likely_data { #define __diag_ignore_all(option, comment) #endif +/* Provide no-op for non-null static code analysis hint if unsupported */ +#ifndef ASSUME_NONNULL +# define ASSUME_NONNULL(ptr) do { } while (0) +#endif + #endif /* __LINUX_COMPILER_TYPES_H */ -- 2.43.0